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F?A PRINCE GEORGE'S COUNTY MARYLAND July 1981 '7" e 7; 7j W.Z ;"P, wz" 'k W'. TC 224 .M3 F66 1981 Fnvironmental Planning Division THE MARYLAND-NATIONAL CAPITAL PARK AND PLANNING COMMISSION FLOOD DAMAGE INVENTORY PRINCE GEORGE'S COUNTY MARYLAND JULY 1981 Environmental Planning Division The Maryland-National Capital Park and Planning Commission FLOOD DAMAGE INVENTORY PRINCE GEORGE'S COUNTY MARYLAND Prepared by: The Environmental Planning Division The Maryland-National Capital Park and Planning Commission 14741 Governor Oden Bowie Drive Upper Marlboro, Maryland 20772 for: The Maryland Department of Natural Resources Tidewater Administration Coastal Resources Division and Water Resources Administration Tawes State Office Building Annapolis, Maryland 21401 THE MARYLAND-NATIONAL CAPITAL PARK AND PLANNING COMMISSION PRINCE GEORGE'S COUNTY PLANNING BOARD CHARLES A. DUKES, JR., Chairman EDWIN H. BROWN JOHN W. CHURCHILL JOHN H. CUMBERLAND ANN C. SHOCH DEPARTMENT HEADS MONTGOMERY COUNTY PLANNING BOARD THOMAS H. COUNTEE, JR. Executive Director NORMAN L. CHRISTELLER, Chairman MABLE GRANKE A. EDWARD NAVARRE JUDITH B. HEIMANN Secretary-Treasurer BETTY ANN KRAHNKE SHELDON P. SCHUMAN ARTHUR S. DREA, JR. General Counsel JOHN F. DOWNS, JR. Planning Director Prince George's County RICHARD E. TUSTIAN Planning Director Montgomery County HUGH B. ROBEY Director of Parks and Recreation Prince George's County STANTON G. ERNST Director of Parks Montgomery County ROBERT D. REED Community Relations Officer Prince George's County JOHN HOOVER Community Relations Officer Montgomery County Prince George's County Regional Office Montgomery County Regional Office County Administration Building 8787 Georgia Avenue 14741 Governor Oden Bowie Drive Silver Spring, Maryland 20907 Upper Marlboro, Maryland 20772 ii ACKNOWLEDGEMENTS We would like to acknowledge the significant contributions made by those participating in the preparation of the Flood Damage Inventory. ENVIRONMENTAL PLANNING DIVISION Stan Udhiri, Chief Dominic J. Motta, Planner III* Wendell E. John, Planner I* Frances J. Guertin, Secretary III PLANNING DEPARTMENT ASSISTANCE Lauren Arth, Word Processing Operator IV Charles Colella, Drafting Technician III William Limpeft, Water Resources Planning Assistant Benetta Yeatman, Drafting Technician II MARYLAND WATER RESOURCES ADMINISTRATION STAFF ASSISTANCE Robert B. Dannecker, Chief, Flood Management Division Mary Lou Soscia, Natural Resources Planner *Primarily responsible for the report. Contents Page SUMMARY ..................................................... 1 1.0 Purpose of Study ...................................... 2 1.1 Background ...................................... 2 1.2 Authorization .................................... 2 1.3 Coordination ..................................... 2 1.4 Methodology ..................................... 3 2.0 County Description .................................... 3 2.1 Location and Physiographic Description ............ 3 2.2 Major Watersheds ................................. 5 3.0 Flooding Problems ..................................... 5 3.1 Countywide Discussion ............................ 5 3.2 Potomac River Sub-Watershed ...................... 9 3.21 Anacostia River ............................. 9 3.22 Beaverdam Creek ............................. 12 3.23 Oxon Run ................................... 13 3.24 Henson Creek ............................... 14 3.25 Piscataway Creek ............................ 15 3.26 Tinkers Creek .............................. 15 3.27 Mattawoman Creek ............................ 17 3.28 Lower Potomac ............................... 18 3.3 Patuxent River Sub-Watersheds .................... 18 3.31 Upper Patuxent ........ i ..................... 18 3.32 Horsepen Branch ............................. 18 3.33 Western Branch ............................. 20 3.34 Collington Branch ........................... 23 3.35 Charles Branch ............................. 23 3.36 Middle Patuxent ............................. 24 3.37 Lower Patuxent ............................. 24 4.0 References .......... ................................... 27 Appendix A - Sample Letter of Notification .................. A-1 Appendix B - Highwater Elevation of Selected Prince George's County Bri dges ................................. B-1 Appendix C - Selected Comments on Floodprone Properties ..... C-1 Appendix D - Inventory of Floodprone Structures ............. D-1 iv Tables Page 1. Structures Impacted by the 100-Year Flood Prince George's County ....................................... 7 Figures 1. Vicinity Map ................................................ 4 2. Major Watersheds 6 3. Percentage of Flood-prone Structures by Watershed 8 4. Flood-prone Structures - Anacostia River and Beaverdam Creek Watersheds ............. 10 5. Percentage of Flood-prone Structures - Anacostia.Sub-Watershed ................................... 11 6. Flood-prone Struct-ures - Oxon Run/Watts Branch and Henson Creek Watersheds ......... 14 7. Flood-prone Structures - Piscataway Creek and Tinkers Creek Watersheds ............. 16 8. Flood-prone Structures Upper Patuxent ........................................... 19 9. Flood-prone Structures - Western Branch and Collington Branch Watersheds ........... 21 10. Percentage of Flood-prone Structures Western Branch Sub-Watersheds ............................. 22 11. Flood-prone Structures Middle Patuxent ........................................... 25 12. Flood-prone Structures - Lower Patuxent ............................................... -26- v Summary This report contains an inventory and aerial cataloging of flood-prone properties in Prince George's County. On the basis of this study, a total of 11676 structures comprising 1,260 residential, 273 commercial and 143 other structures are wholly or partially in the floodplain. This inventory will serve as a pilot project for possible replication Statewide, to allow for assessment of the potential magnitude and frequency of flood damage in the State. The information contained in such an inven- tory will also help the State assess mitigation alternatives and priorities for governmental action. 1.0 Purpose of Study The purpose of this study is to inventory and catalogue floodprone properties in Prince George's County. This information will help the State administer the Flood Management Grant Program and serve as a vehicle for notifying the owners of floodprone properties of floodprone hazards, and the relief available through federally subsidized flood insurance. 1.1 Background Although 1 arge amounts of public funds have been spent in Maryland to mitigate damage from periodic flooding, no concerted effort has been made state-wide to collect, assess or distribute information on flood damages. It is particularly discouraging that no comprehensive effort has been made to notify the owners of potentially floodprone structures of the avail- ability of federally subsidized flood insurance. In order to address this situation, the Environmental Planning Division of the Prince George's County Planning Board, in cooperation with the Maryland Water Resources Administration and the Coastal Zone Management Program has undertaken an inventory of flooding problems within the County. This "Flood Damage Data Inventory" will serve as a pilot project for possible replication state- wide. The informati-on gathered will result in an aerial cataloging and filing system for storage and retrieval of flood damage information which will allow assessment of flood damaged areas including history, average annual damages, mitigation alternatives and priority for governmental action. 1.2 Authorization This study was prepared in accordance with Contract No. C4-78-440(81) between the State of Maryland, Department of Natural Resources, Tidewater Administration, Coastal Resources Division and the Maryland-National Capital Park and Planning Commission - representing Prince George's County. 1.3 Coordination Interviews were conducted with staff of the Washington Suburban Sani- tary Commission and the Department of Public Works. Information on flood- ing due to stream overflows and inadequate drainage was sought from resi- dents of the watersheds. A thorough review of available information on flooding and inadequate drainage problems was also conducted to assist in the identification of floodprone properties. Fortunately, a considerable amount of information on flooding problems exists for Prince George's County including U.S. Army Corp of Engineers Floodplain Information Reports. Although some of these studies were performed over ten years ago and are in need of updating, they do provide useful historical flood infor- mation. In addition, some information is readily available from Stormwater Management Studies and Comprehensive Watershed Management Plans being pre- pared by the County's Storm Water Management Technical Group. Of particu- 2 lar value was the report on Flooding prepared by the Prince George's County Task Force after the occurrence of Hurricane Agnes in June 1972. 1.4 Methodology In order to manage the flood data by geographic zones, the boundaries of major watersheds were delineated. Within each watershed, the best available floodplain delineation was used in conjunction with recent aerial photography and County Premise Address Maps to identify the location and address of floodprone properties. Since one of the principal purposes of the study is to notify property owners of the floodproness of their struc- tures, a conservative approach was used whereby all borderline structures were included in this initial inventory. 2.0 County Description 2.1 Location and Physiographic Description Prince George's County is a 485 square mile jurisdiction which lies directly to the east and borders on Washington, D.C. The Patuxent River forms the northern and eastern boundaries of the County; while the Potomac River, District of Columbia and Montgomery County form the western bound- ary. Charles County lies directly to the south. The location of the County is shown in Figure 1. The physical characteristics of the County are defined primarily from the underlying geology as altered by climatic and hydrologic conditions. Except for a small area along the Montgomery County boundary, Prince George's County lies almost entirely within the physiographic province known as the Atlantic Coastal Plain. The geology of the Coastal Plain con- sists of unconsolidated sediments of sand, silt, clay and gravel deposited upon the underlying crystalline rocks. The depth of these sediments decrease from east to west, thinning out in a wedgelike manner near the border between Montgomery and Prince George's Counties. The northern part of the Coastal Plain in Prince George's County is gently rolling and has broad valleys. The remainder is a partly dissected 4-ow-pl-a_teau that extends into Charles County. Near the Patuxent and Potomac Rivers this plateau is cut by V-shaped valleys that have short, steep slopes. Elevations range from sea level along the lower reaches of the major rivers to over 400 feet in the northernmost portion of the County near the Rocky Gorge Reservoir. All the major streams in the County are normally sluggish and most are in broad valleys. Because coastal plain soils are highly erodible, silta- tion is a major problem. The wide valleys with extensive floodplains also lead to considerable flooding problems during major storm events. 3 F I GURE I LOCATION OF PRINCE GEORGE'S COUNTY, MARYLAND CARROLL COUNTY FREDERICK F COUNTY iBALTIMORE HOWARD COUNTY 7 0 MONTGOMERY, COUNTY 0 L N f Y 10 11 301 I kEL ... .... AN E :k94*�AHX, /ARUNOEL LOUDOUN COUNTY H RNU*i@N COUNTY ............. H FA I RFA X V A S H I N G T -X . ..... .... ......... COUNTY J 0 C. ::::- .::::ii ... ARLINGTON ....... ....... .... ...... COUNTY ......w ALEXANDRIA ....... ......... .............. . ..... .. ............ . . ;z N ................ V I R G I N I A .......... ............ ..ATLAND .... .. .... Ltj PRINCE WILLIAM CALVERT COUNTY COUNTY CHARLES COUNTY l4t@-o 1111c 4 2.2 Major Watersheds Prince George's County is divided almost equally between two major river basins, the Potomac River which occupies the western half of the County and the Patuxent River which occupies the eastern half. The Potomac River Basin is largely urbanized and contains most of the existing residen- tial, commercial and industrial development in Prince George's County. The Patuxent River, on the other handt is still mostly rural and is dominated by agricultural land uses. For the purpose of watershed planning and to facilitate a discussion of flooding problems,.each River Basin has.been divided into major sub- watersheds as follows: Potomac River Basin Patuxent River Basin Anacostia River Upper Patuxent Beaverdam Creek Horsepen Branch Oxon Run Western Branch Henson Creek Collington Branch Piscataway Creek Charles Branch Tinkers Creek Middle Patuxent Lower Potomac Lower-Patuxent The location of these sub-watersheds is identified on Figure 2. A complete description of each sub-watershed is included in Section 3.0 under flooding problems. 3.0 Flooding Problems 3.1 Countywide Discussion As land uses in Prince George's County have changed from rural agri- cultural and forest uses to urban and suburban subdivisions, shopping centers and employment parks, the impact of flooding has gradually increased. Although floodplain encroachments have been minimized in recent years by strong local regulation, occasional conflicts still occur due to changes in stream hydrology and hydraulics and changes in the definition of the regulated floodplain. The effect of changing land uses on flood damage was brought into sharp perspective on June 22, 1972, when tropical storm Agnes struck and left in its wake damage and disruption unequalled by previous storms. Agnes caused more than $10 million in damage in Prince George's County and resulted in a heightened-appreciation of the power of floodwaters. Because most of the development in Prince George's County has occurred in the Potomac iRiver Basin near Washington, D.C. the majority of the flood- ing problems have also occurred in this basin, particularly in the Anacos- tia sub-watershed. Our inventory has identified a total of 1,646 flood- prone structures including 1,209 in the Potomac River Basin and 439 struc- tures in the Patuxent River Basin. While 86% of the flood-prone residen- tial structures are located in the Potomac Basin only 48% of the flood- 5 FIGURE 2 WALKER BRANCH PRIORITY WATERSHED,@ BEAR BRANCH FOR PRINCE GEORGES COUNTY R NT RV HORSEIPEN BRANCH I E UXENT ST Co OX0. U HE EK_' Tt*KE ANO Is R E fbD POT. T N. C E BASIN OMPE SUB-BASIN DIVIDE -6- Irf-TM MAWAAM-NAMM CAMAL MM NO RANNOW CQ*MSMM SOMM MARYLAM 06OL00" SUn" TOPOMA"NC MM Table 1 Structures Impacted by 100-Year Flood Structures Watershed Total Residential Commercial- Other Anacostia 811 721 78 12 Beaver Dam Creek 97 65 31 1 Oxon Run 9 9 - - Henson Creek 203 188 11 4 Piscataway Creek 73 71 1 1 Tinkers Creek 44* 34* 9 1 Lower Potomac - - - - Total Potomac 1,239 1,088 130 19 Upper Patuxent 79 30 49 - Horsepen Branch - - - - Western Branch 324 ill 93 120 Collington Branch 16 11 1 4 Charles Bra-nch - - - Middle Patuxent 6 6 Lower Patuxent 14 14 - -- Total Patuxent 439 172 143 124 Total County 12676 1,260 273 143 Includes 30 trailer homes FIGURE 3 PERCENTAGE OF.FLOODPRONE STRUCTURES MAJOR WATERSHEDS Anacostia 48% 0 0000000 0000 0000000000 0000000 0000000000000 000000000 00000000000000 0000000000000000000000000000 000000000000000000000000000000 00000000000000000000000000000000 000000000000000000000000000000000 0000000000000000000000000000000000 00 0000000000000000000000000000000000 00 000000000000000000000000000000000000 000 00000000000000000000000000000000000000000 000000000000000000000000000000000000000000 0000000000000000000000000000000000000000000o 000000000000000000000000000000000000000000000 0000000000000000000000000000000000000000000oo 0000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000 000000000000000000000000000000000000000000000000 000000000000000000000000000000000000000000000000 0000000000000000000000000000000000000000000 Collington Br. 000000000000000000000000000000000000 00000000000000000000000000000 ---------- 1% Beaver Dam Cr. 6% Oxon Run Western Br. 01 1% 19,0 ANN\+ \N\ \N\ + + + Henson Cr. + 12% + + Piscataway Cr. + + Patuxent 4%@ Tinkers Cr. 6% 3% 8 prone commercial structures are located there. The majority of the flood- prone commercial structures are located in the City of Laurel in the Upper Patuxent sub-watershed. Table 1 identifies the number of structures by type and watershed impacted by the 100 year flood in Prince George's County. The percentage of flood-prone structures by watershed is dia- grammed in Figure 3. 3.2 Potomac River Sub-Watersheds 3.21 Anacostia River Watershed The Anacostia River Watershed is 120 square miles with 68 square miles of the lower portion within Prince George's County and the remainder in Montgomery County. The entire watershed has been designated a State Scenic River and is currently being studied under this program. The two main tributaries of the Anacostia are Northeast and Northwest Branches. These tributaries originate in the Piedmont in Montgomery County, cross the fall line onto the Coastal Plain and merge into a tidal estuary near the D.C. line. Land use within the watershed is varied with the lower reaches inside the Capital Beltway heavily developed with 6 mixture of residential, commercial, industrial and institutional uses. Outside the Beltway, the watershed is less developed with the Beltsville Agricultural Research Center making up a large area of agricultural and forestry uses. An exten- sive stream valley park system provides recreational and open space bene- fits to large numbers of County citizens. Because much of the Anacostia River Watershed is heavily developed,. numerous flooding problems exist. A total of 811 structures have been identified within the watershed including 721 residential structures, 78 commercial and 12 other structures. Figure 4 identifies the approximate location of these flood-prone structures. Six major tributaries contribute to the flow of the Anacostia River. These are: Northwest Branch, Sligo Creek, Northeast Branch, Indian Creek, Paint Branch and Little Paint Branch. The relative severity of flooding in each of these tributaries is shown in Figure 5. Northwest Branch and its tributary Sligo Creek were probably the hardest hit streams in the watershed during the flood resulting from Trop- ical storm Agnes in June 1972. Damages were particularly severe in the communities of Lewisdale, Riggs Manor and Chillum where over 200 homes were flooded. Other flood-prone areas include the region around the Queens Chapel and Queenstown shopping complex and the Queenstown Apartments. The major floodprone areas in Northeast Branch include Riverdale and East Riverdale. In the Paint Branch and Little Paint Branch watersheds serious flooding occurs in Lakeland, the Cherry Hill Subdivision and areas along Route 1. A significant number of floodprone properties are found along Indian Creek in Beltsville Heights, Greenwood Road, Somerset Avenue, Springhill Lake, Old Branchville Road and Berwyn Heights. - 9 - FIGURE 4 ANACOSTIA RIVER & BEAVERDAM CREEK WATERSHEDS STRUCTURES IMPACTED BY 100 YEAR FLOODPLAIN \@NCRTH N. COSa IA I 29 8 24 6 29 66 Is 111 972 124 22 2 14 so 469 /0000 2 6 10 2 CREEK LEGEND: RESIDENTIAL STRUCTURES k COMMERCIAL STRUCTURES lINDICATES NUMBER OF BUILDINGS FIGURE 5 PERCENTAGE OF FLOODPRONE STRUCTURES ANACOSTIA SUB-WATERSHEDS Northwest Br. 39% .......... Indian Cr. 9% ........ . 00 0000000 ...... 0000 . .... 00000 0 00000 0 00000000 000 000900010000000000000 rA 0 )0 0 0 0000000000000 000000000000000 Paint Br. A' e A joA 000000 0 0 > 000 000 00 00 9% 00000 0 0000000 <A4 v b A A A 7 rtheast Sr. Sl i go Br . 1, , > "I -. ,. % 3- r .' 30% 7 , , 4 r 13% P..A 'A , A 1 7, "'r A 4 4 c f. 4 In response to the known flooding problems in the Anacostia Watershed, a number of projects have been developed or are planned to alleviate some of the worst flooding problems and prevent an increase in flooding in the future. Many of these projects were initiated by the U.S. Army Corps of Engineers in coordination with the WSSC and include the realignment and excavation of reaches on Sligo Creek, Northwest Branch, Paint Branch, Indian Creek, Northeast Branch and the Anacostia River. Other flood con- trol projects within the watershed include earthen levees, storage ponds, impoundments, reconstructed bridges and pump stations for the conveyance of stormwater. Two major flood control projects are currently included in the WSSC CIP (Capital Improvement Program) for Northwest Branch at Allison Street in Brentwood and for Indian Creek in Beltsville. When these two projects are completed, approximately 236 structures will no longer be impacted by the 100 year flood. Prince George's County plans to initiate a Comprehensive Watershed Management Plan for this watershed in FY 1983 to further address present and future flooding problems. 3.22 Beaverdam Creek Watershed The Beaverdam Creek Watershed which consists of approximately 16 square miles of land area is adjacent to the District of Columbia and south of the Baltimore-Washington Parkway. Much of the basin is already devel- oped with a considerable number of commercial and industrial establish- ments. A major highway (Route 50), the Penn Central Railroad, and a Metro Transit line all closely parallel the mainstem of Beaverdam Creek. Flooding problems occur along the mainstem of Beaverdam Creek and its major tributaries, Cabin Branch and Cattail Branch. The major problems are due to loss of natural storage from floodplain encroachment and increased runoff from major graded, paved and piped or channelized reaches. Loss of conveyance due to obstructions, debris and sedimentation and undersized bridge openings also add to flood stages. Ninety-seven (97) structures were identified by this survey as potentially floodprone, including 65 residential structures and 32 commercial or other structures. Figure 4 identi.fies the general location of flooding problems in the Beaverdam Creek Watershed. The most serious flooding dccurs in the lower portions of the watershed in the north Englewood section of Cheverly, Beaverdam Estates, Beaver Road Industrial Area, Columbia Park and Tuxedo Industrial Area. Flooding also occurs in Palmer Park along Cattail Branch and in Carmody Hills and Cedar Heights along Cabin Branch. I Because the watershed is already heavily developed., the County has been pursuing a site specific approach to manage the increased stormwater flows, instead of developing a Comprehensive Watershed Management Plan. The site specific approach, however, will not alleviate existing flooding conditions. Consideration is therefore being given to initiating a Compre- hensive Watershed Management Plan in FY 1983. 12 3.23 Oxon Run and Watts Branch Watershed Oxon Run is a 14 square mile watershed. It drains the area inside the Beltway at the southern portion of the Prince George's County that borders the District of Columbia. Approximately 10 square miles of the watershed are located in Prince George's County. The small Watts Branch Watershed which drains from Capitol Heights and Maryland Park towards the District of Columbia, is also included as part of Oxon Run in this inventory. Despite being the most completely developed watershed in Prince George's County with primarily residential land uses, Oxon Run has been one of the more successfully managed urban streams in Prince George's County. Much of the downstream portion of Prince George's County has been protected from inten- sive development by parkland, cemetery and other open space uses. This has helped to minimize flood damages in the past; however, floodplain encroach- ment and channelization within the cemeteries may have an adverse impact in the future on properties further downstream. Nine (9) residential structures have been identified as being prone to flooding from a 100 year storm. These residences are located on Green Valley Drive in Suitland on Oxon Run, and Drum Avenue on Watts Branch. Figure 6 identifies the general location of flood-prone structures in the watershed. Because Oxon Run is already highly developed and flood damages minor, no comprehensive watershed study has been completed or is scheduled in the near future. The County's watershed management approach will continue to be site specific. New development will be evaluated on an individual basis to minimize the*effects of increased flows and corrective projects will be constructed where a need is demonstrated. 3.24 Henson Creek Watershed Henson Creek is a 25 square mile watershed located in southwest Prince George's County. The creek originates near Andrews Air Force Base and dis- .charges into an embayment on the Potomac River. Considerable residential development, both single- and multi-family, has already occurred in the upper portions of Henson Creek. The remainder of the basin is gradually developing in single-family residential uses. Future industrial develop- ment near Andrews AFB and a proposed Metro station will spur additional development in the watershed. Although Henson Creek is relatively small in size in relation to the other major watersheds in the County, it has had more than its share of flooding problems. A total of 191 structures has been identified as flood-prone within the watershed including 176 residen- tial structures, 11 commercial and 4 other structures. Figure 6 identifies the general location of these flood-prone properties. The upper portion of the watershed, which is generally flat, has experienced considerable devel- opment, some of which has encroached on the floodplain. The most serious flooding problems in this portion of the watershed have occurred along Woodland Road, Weldon Drive, Keppler Road and Beachcraft Court. The lower portion of Henson Creek has some special flooding problems. Several tribu- taries including Hunters Mill Branch, originate on old alluvial terraces - 13 - FIGURE 6 OXON RUN & HENSON CREEK WATERSHEDS STRUCTURES IMPACTED BY 100 YEAR FLOODPLAIN Ox 0 @NO R T H CA 2 95 9 17 HEN C lop 6 LEGEND; Q RESIDENTIAL STRUCTURES 15 CCMMERCIAL STRUCTURES kINDICATES NUMBER OF BUILDINGS -14 - along the Potomac River and cut V-shaped valleys with short, steep slopes. These streams generate'high flash runoffs and erosion problems which result in sedimentation and flooding conditions when level areas and inadequate culverts are encountered. This problem is particularly severe due to back- water effects at Indian Head Highway. Below Oxon Hill Road, Henson Creek is re-named "Broad Creek" and is a wide flat stream under tidal influence where much of the sediment load from the entire system is deposited. Past efforts to control flooding within the watershed include several small channelization projects. In particular, a flood channel constructed along the main stem in the vicinity of Woodland Road should help to decrease flooding in this area. The current WSSC CIP includes a project to alleviate the flooding along Weldon Drive. A Comprehensive Watershed Management Plan for the Henson Creek Watershed has been initiated and will be completed during FY 1982. This Plan will address the stormwater manage- ment and erosion control problems and will recommend solutions to present and future flooding problems. 3.25 Piscataway Creek Watershed Piscataway Creek is a 67 square mile watershed located in Southern Prince George's County. Rising on Andrews AFB, the creek flows in a south- westerly direction, discharging into a large eimbayment on the Potomac. Of its 67 miles of land area, 17 are included in the Tinkers Creek Watershed which will be discussed separately. Much of the watershed remains in rural land uses with scattered residential subdivisions. Most of this develop- ment occurs in the north central portion of the basin along Md. Route 5. Because development has not progressed as rapidly as expected, flooding problems have not been severe in this watershed. However, development in the upper portions of the Piscataway Creek Watershed is expected to in- crease significantly in the future, and could generate more flooding prob- lems in the middle and lower portions of the basin. This survey identified 73 structures which are potentially prone to flooding during the 100 year storm including 71 residential structures I commercial structure and I other structure. Figure 7 identifies the general location of these struc- tures. The most serious flooding problems within the watershed are on the lower portion of the mainstem along Livingston Road, Floral Park Road and in the lower portions of Windbrook Subdivision. Further upstream, the Clinton Acres Subdivision is also subject to flooding problems. In order to address the problems of present and future flooding, a Comprehensive Watershed Management Plan has been initiated for the Piscat- away Creek Watershed. This Plan will be completed during FY 1983. 3.26 Tinkers Creek Watershed Tinkers Creek is a 17 square mile watershed, which is a majorr tr'ibu- tary of Piscataway Creek. The two major tributaries of Tinkers Creek, 15 FIGURE 7 TINKERS CREEK &PISCATAWAY CREEK WATERSHEDS STRUCTURES IMPACTED BY 100 YEAR FLOODPLAIN RTH ki, TINKER CATAWA -R 15 LEGEND: (D RESIDENTIAL STRUCTURES k 5 COMMERCIAL STRUCTURES lINDICATES NUMBER OF BUILDINGS 16 Meetinghouse Branch and Pea Hill Branch originate on Andrews AFB and flow in a southwesterly direction for above @ive miles to their confluence with the main Creek, which continues for about another five miles before meeting Piscataway Creek. Land use within the watershed is primarily residential with a considerable amount of undeveloped land remaining. A total of 14 structures have been identified within the Tinkers Creek Watershed as being flood-prone'during a 100 year storm. This total includes 4 residential structures and 9 commercial structures and 1 other structure. Figure 7 identifies the general location of these flood-prone properties. The most severe flooding occurs along Coolridge Drive in the Coolridge Subdivision. For the 100 year flood, as many as eight existing structures will experience varying levels of flooding. There is an isolated home and two other structures located north of Southeast Trailer Park that are also flood-prone. In the western section of Southeast Trailer Park, across from Temple Hill Estates, approximately 30 trailer homes are within the 100 year flood limits. Because of the type of structures involved, the effect of flooding could be more severe than with conventional structures. On the northern end of the Rose Valley Airport runway, two commercial structures are within the floodplain limits. A number of roads and bridges within the watershed are also susceptible to flooding. Tinkers Creek was the first basin to be studied by the Prince George's County Stormwater Management Technical Group. A Technical Data Base Report and Watershed Management Plan were completed in 1980 which addresses storm- water management and erosion control needs in the watershed. The recom- mended plan consists primarily of constructing three dry ponds within the Andrews AFB, one behind Georgia Avenue and a second at Branch Avenue both in Meetinghouse Branch and a third behind Branch Avenue and Paynes Branch. Together, the three detention ponds will remove all homes and commercial buildings within Tinkers Creek from the 100-year floodplain. They will also reduce the extent and frequency of flooding of roads and bridges. Thi-s project has been adopted by Prince George's County and included in the Capital Improvement Program. -The project is expected to be completed by FY 1983. 3.27 Mattawoman Creek Mattawoman Creek forms a major portion of the boundary between Prince George's and Charles Counties, with approximately 24 square miles of the watershed located in Prince George's County. Land use within the Prince George's County portion of the watershed is predominantly rural with scat- tered low-density residential, agricultural and forestry uses. Current plans, however, call for major residential, commercial and industrial development in the area adjacent to Route 301. Most of the existing devel- 6pm@ent and subsequent flooding problems within the watershed occur in Charles County where several subdivisions encroach on the floodplain. Except for road flooding, the Prince George's County portion of the water- - 17 shed seems to be free of flooding problems. No structures were identified by this survey. The Maryland Water Resources Administration i@ currently delineating the 100-year floodplain for this watershed. A Comprehensive Watershed Management Plan is not currently programmed for Prince George's County. 3.28 Lower Potomac The Lower Potomac consists of a number of small watersheds directly tributary to the Potomac River in the southwest portion of Prince George's County below Piscataway Creek. This area is sparsely developed and flood- plains have not been delineated. No structures were identified by this survey as flood-prone in this area. 3.3 Patuxent River Sub-Watersheds 3.31 Upper Patuxent The Upper Patuxent consists of the Patuxent River and its tributaries from the Rocky Gorge Reservoir to the confluence with Horsepen Branch. A considerable amount of development has occurred in the upper porti 'on of this area which includes the City of Laurel. The area below the Baltimore- Washington Parkway is largely within the Patuxent Wildlife Research Center where floodplain disturbance is prohibited. Severe flooding has occurred in the City of Laurel on 5 occasions since 1933, including the most spec- tacular flooding in Prince George's County during tropical storm Agnes in June 1972. The most serious flooding occurs in a 4,600 foot long reach from just upstream of U.S. Route 1, south to Maryland Route 198. Numerous commercial properties including Laurel Race Track, Laurel Plaza Shopping Center, Laurel Pines Golf Course, WLMD radio broadcasting station and Montpelier Plaza Shopping Center are subject to flooding during the 100 year storm. A total of 79 structures have been identified within the Upper Patuxent area as subject to flooding including 30 residential struc- tures and 49 commercial or other structures. Figure 8 identifies the general location of floodprone structures within the watershed. Very little can be done to reduce flooding potential on the Upper Patuxent. The WSSC has adopted a policy of operating its water supply reservoirs above Laurel with flood control in mind as well as water supply and to carefully monitor upstream storm events in order to allow earlier and more gradual release of flood peaks. This should help to decrease the severity of flooding. 3.32 Horsepen Branch The Horsepen Branch Watershed comprises approximately 6.5 square miles of land area in the vicinity of Bowie.. Maryland. Land use within the basin is primarily residential. The Town of "Old Bowie" is centrally located within the watershed, with more recently developed residential subdivisions scattered throughout the area. 18 FIGURE 8 UPPER PATUXENT WATERSHED STRUCTURES IMPACTED BY 100 YEAR FLOODPLAIN T@ HOWARD DUCKETY 10 "AMC" '\,,,@NORTH UP R P X T lie LEGEND: RESIDENTIAL STRUCTURES 15 COMMERCIAL STRUCTURES kINDICATES NUMBER OF BUILDINGS 19 The 100 year floodplain of Horsepen Branch has not been delineated and the entire watershed has been identified as Zone "C" on the FIA map. For this reason and because very little development has occurred in the vicin- ity of the mainstem, no structures have been identified as flood- prone. Several tributaries to Horsepen Branch do cross under the Pennsylvania Railroad through inadequate culverts, which creates the potential for back- water flooding. 3.33 Western Branch Watershed The Western Branch Watershed is the largest watershed wholly within the County, comprising 70 square miles of land area. Most of the watershed lies outside the Beltway; however, a portion is located inside the Beltway in the Forestville area. Land use in Forestville is a mixture of residen- tial., commercial and industrial. Outside the Beltway, the basin is charac- terized by rural land uses, with residential development concentrated along Central Avenue and in the upper reaches of the watershed along Bald Hill and Folly Branches. Most of the streams within the Western Branch Watershed-have flat gradient and sluggish flows. The overbank areas are also flat and in many sections marshy. For these reasons, periodic flooding from stream'overflow occurs along most of the mainstem and tributaries. A total of 324 structures has been identified within the Western Branch Watershed as being flood-prone during a 100 year storm under full development. This total includes 111 residential structures, 93 commercial and 120 other structures. Figure 9 identifies the general location of flood-prone structures within the watershed. Several major sub-watersheds contribute flow to the mainstem of Western Branch. The most severe flooding occurs in the two uppermost sub- watersheds along Folly and Bald Hill Branches. In these sub-watersheds a combination of floodplain encroachment, stream siltation and backwater effects from inadequate structure openings increase the incidences of flooding. Fifty (50) of the 111 flood-prone residential structures are located within these watersheds. There have been reports of frequent flooding of commercial and residential properties along Lanham-Severn Road, Wellington Place, 4th, 5th, and 6th Streets, adjacent to Bald Hill Branch. Another area of potential flooding is along Southwest Branch where roads are frequently closed by flood water, and some residential and commercial developments were built on flood-prone land. Fifty (50) structures includ- ing 20 residences are located within the Southwest Branch floodplain. The flooding is particularly severe at Hampton Mall near Central Avenue and Route 495. Figure 10 represents the distribution of flood-prone structures among the sub-watersheds of Western Branch. Along-the'n.ainstem of Western Branch, flooding potential is most severe in the Town of Upper Marlboro where 89 structures have been identi- - 20 - FIGURE 10 PERCENTAGE OF FLOODPRONE STRUCTURES WESTERN BRANCH SUB-WATERSHEDS Western Main Stem 41% Back Br. 1% 00000 urkey Br. 00 2% 00 Cabin Br. C/ V 7 r 210 Southwest Br. + + + 164 -7 + q IC 1, .*.*. ), @L . ... + + I r Bald Hill Br. + + 13% r -'t AC A + + + + + + + + + Northwest Br. 201 /0 Lottsford Sr. 1% Federal Spring Br. 4% . . . . . . . Collington Br. Folly Br. 6% 12% 22 fied as flood-prone. Several road crossings on the mainstem are closed for many hours each year due to overtopping. Past efforts to control flooding within the watershed included con- struction in December 1964 of a local levee system along the mainstem near the Town of Upper Marlboro. A comprehensive Watershed Management Plan is currently being prepared for Western Branch. This Plan, when completed, will address stormwater management problems and erosion control needs and will recommend solutions to present and future flooding problems. 3.34 Collington Branch Watershed The Collington Branch, a major contributary to Western Branch, has a long, narrow 23 square mile watershed which parallels the west side of Route 301 from Bowie to Upper Marlboro. Land use varies from single-family residential in the vicinity of Bowie to rural and agricultural uses throughout much of the remainder of the basin. A major industrial park is planned for a portion of the basin just south of Route 214. The watershed has remained mostly undeveloped and floodplain encroachments have been minimized. A total of 16 structures have been identified within the water- shed as potentially flood-prone during a 100 year storm under full develop- ment. This total includes 11 residential structures 1 commercial and 4 other structures. in addition, 7 road crossings are wholly or partially within the floodplain; however, none of the major transportation arteries would be affected. Figure 9 identifies the general location of the flood- prone structures. The most severe flooding within the waterhsed occurs near the conflu- ence of Collington and Western Branches where 8 residential and commercial structures have been identified as flood-prone. Flooding of these struc- tures would be due primarily to the backwater effect from high stages in Western Branch. The U.S. Army Corps of Engineers completed a flood control project, consisting of floodwalls and channel improvements in 1964, near the-Town of Upper Marlboro. There are no other flood protection measures within the watershed. A Comprehensive Watershed Management Plan is currently being prepared for Collington Branch. This Plan, when completed, will address stormwater management problems and erosion control needs. It will also recommend solutions to present and future flooding problems. 3.35 Charles Branch Charles Branch is an 18 square mile watershed located east of Andrews AFB and south of Route 4. Charles Branch discharges into Western Branch near its confluence with the Patuxent River. Land use within the basin is primarily agricultural with a few scattered residential subdivisions. One large subdivision, Marlton has developed to the east of Route 301. The suburban development which has occurred in the watershed has been recent enough to be regulated so as to avoid floodplain encroachment. The 100 - 23 - year floodplain has not been delineated and the watershed is identified as Zone "C" on the FIA maps. This survey did not reveal any structures within the watershed prone to flooding. A Comprehensive Watershed Management Plan for Charles Branch has not been prepared; however, one will be initiated in FY 83. 3.36 Middle Patuxent River For the purpose of this survey, the Middle Patuxent is defined as the area along the Patuxent River from its confluence with Horsepen Branch to its confluence with Western Branch. The floodplain in this area is largely undisturbed except near Priest Bridge. This survey identified 6 residen- tial structures within the 100 year floodplain. Figure 11 identifies the general location of these flood-prone areas. Most of the flood-prone structures are located in the vicinity of Priest Bridge. Very little can be done to control flooding in these areas except to prevent further encroachment in the floodplain and to minimize erosion to preserve existing channel capacity. 3.37 Lower Patuxent River The Lower Patuxent Area is defined for the purpose of this study as the Patuxent River and its tributaries south of the Western Branch Water- shed. This area is almost entirely rural with only scattered low-density development. The only exceptions are the Nottingham and Eagle Harbor com- munities and the Chalk Point Power Plant near the southeast tip of Prince George's County. Our survey did identify a total of 15 residential struc- tures including 12 in Eagle Harbor as subject to potential flooding during a 100 year storm event. Figure 12 identifies the location of flood-prone structures in the Lower-Patuxent Area. 24 FIGURE 11 MIDDLE PATUXENT WATERSHED STRUCTURES IMPACTED BY 100YEAR FLOODPLAIN @@NCRTH MID T LEGEND: Q RESIDENTIAL STRUCTURES k 5 COMMERCIAL STRUCTURES I INDICATES NUMBER OF BUILDINGS FIGURE 12 LOWER PATUXENT WATERSHED STRUCTURES IMPACTED BY loo YEAR FLOODPLAIN 1\1' @No R T H SIRCE XENT CREE 5 7 LEGEND: 02- RESIDENTIAL STRUCTURES 5 COMMERCIAL STRUCTURES @IkIINDICATES NUMBER OF BUILDINGS 26 4.0 References 1. Booker Associates, Inc., "Beachcraft Court Stormwater Management Study, Prince George's County, Maryland", WSSC, November 1979. 2. Booker Associates, Inc., "Oxon Run Floodplain Study, Prince George's County, Maryland", WSSC, July 1979. 3. Clark, Finefrock and Sackett, "Indian Creek Stormwater Management Study, Prince George's County, Maryland", WSSC, December 1979. 4. Clark, Finefrock and Sackett, "Weldon Drive Stormwater Management Study, Prince George's County, Maryland", WSSC, August 1979. 5. Enviro Plan, Inc., "Environmental Assessment of the Henson Creek Relief Sewer and Stormwater Management Project", WSSC, January 1976. 6. Federal Insurance Administration, "Flood Hazard Boundary Maps", Department of Housing and Urban Development, August 1976. 7. Gannett, Fleming, Corddry and Carpenter, Inc., "Preliminary Stormwater Management Study at Allison Street-Brentwood on Northwewt Branch, Anacostia River", WSSC, April 1980. 8. Greenhorne & O'Mara, Inc., "Cattail Branch Floodplain Study, Prince George's County, Maryland", WSSC, June 1979. - 27 9. Greenhorne & O'Mara, Inc., "Drum Avenue Drainage Study, Prince George's County, Maryland", WSSC, August 1979. 10. Prince George's County Council's Task Force on Flooding, Report dated September 1974. 11. Prince George's County Stormwater Management Technical Group, "Tinkers Creek Comprehensive Watershed Management Plan", Prince George's County, October 1979. 12. Prince. George's County Stormwater Management Task Force, "FY 1980 Comprehensive Stormwater Management Plan and FY 1980-1985 Capital Improvements Program". 13. U.S. Army Corps of Engineers, "Review Report on Flood Control and Allied Purposes, Patuxent River and Tributaries, Maryland, February 1975. 14. U.S. Army Corps of Engineers, "Henson Creek Floodplain Information Report", March 1966. 15. U.S. Army Corps of Engineers, "Floodplain Information, Piscataway Creek, Prince George's County, Maryland, November 1967. 16. U.S. Army Corps of Engineers, "Floodplain Information, Beaverdam Creek, Prince George's County, Maryland", September 1967. - 28 17. Washington Suburban Sanitary Commission Adopted Six Year Capital Improvement Program, Fiscal Years 1982-1987. I - 29 - APPENDIX "A" SAMPLE LETTER OF NOTIFICATION APPENDIX A Sample Flood Notification Letter This letter of notification was sent to property owners whose homes were found by our analysis to be endangered by the 100 year floodplain. It served to notify the owners of their possible prob- lem and the availability of Federally-subsidized insurance coverage. Dear Property Owner: In-cooperation with the Maryland Water Resources Administration and the Coastal Zone Management Program, the Environmental Planning Division of the Prince George's County Planning Department has initiat- ed an inventory of flooding problems within the County. Information is being gathered which will help the State assess the damage potential and cost of a major flood and plan for necessary relief measures. Due to the scale of maps used and the nature of this survey, some of the properties identified may not actually be flood prone, but based upon a review of existing flood information, it appears that your property may be prone to flooding during a 100-year storm ( a storm with a one percent chance of occurrence in any given year). I would like to emphasize that a conservative approach was taken in identifying flood- prone properties. Any specific information that you can provide based upon your personal observations of flooding in your area will greatly improve the accuracy of our data. I would also like to take this opportunity to inform you of a Federally subsidized flood insurance program that is available to owners of flood-prone properties in Prince George's County. This program, which is administered by the Federal Emergency Management Agency, can provide you with protection from damage. If you have any,questions concerning the Flood Data Inventory Program or wish to provide us with information on flooding, or if you are interested in obtaining flood insurance, please contact the Environmental Planning Division at 952-3651 or 3652. We appreciate your cooperation and assistance. Sincerely, Dominic J. Motta Environmental Planning Division DJM/nlb' A-1 APPENDIX "B" HIGHWATER ELEVATION OF SELECTED PRINCE GEORGE'S COUNTY BRIDGES HIGHWATER ELEVATIONS SELECTED PRINCE GEORGE'S COUNTY BRIDGES Highwater Elevations BRIDGE STREAM JUNE 21. 1972 SEPT. 22-26, 1975 Ammendale Rd. Indian Creek - 127.94 Bealle Hill Road Mattawoman 106.03 104.12 Bock Road Henson Creek 75.73 75.10 Brinkley Road Henson Creek 110.76 113.79 Brock Bridge Patuxent - 116.70 Gallahan Road Tinkers Creek 21.87 24.00 Livingston Road Piscataway Creek 15.51 15.64 Metzerott Road Paint Branch - 74.05 Odell Road Indian Creek - 113.28 Old Baltimore Pike Indian Creek - 106.84 Old Ritchie Road Southwest Branch - 131.72 Oxon Hill Road Henson Creek - 15.93 Piscataway Road Piscataway Creek 22.06 19.59 Ritchie Road Ritchie Branch - 158.65 Sellman Rd. Little Paint Branch - 132.06 Rt. 202 and 408 Western Branch 21.86 24.40 Steed Road Tinkers Creek 137.02 - Sunnyside Avenue Indian Creek - 82.32 SurrattsRoad Piscataway Creek - 128.48 Temple Hill Road Tinkers Creek 186.35 185.67 Temple Hill Road Henson Creek 129.02 126.31 Tucker Road Henson Creek 71.13 68-53 U. S. Rt. 1 Pai,nt Branch - 63.26 Water Street Western Branch 17.90 22.08 White House Road Southwest Branch 57.95 58.35 NOTE: The information contained in this appendix was supplied by the Prince George's County Department of Public Works and Transportation B-1 APPENDIX "C" SELECTED COMMENTS ON FLOODPRONE PROPERTIES APPENDIX 11CH SELECTED COMMENTS FLOODPRONE PROPERTIES Anacostia River Watershed Address Comment 6603 23rd Avenue Hurricane Agnes resulted in 6 ft. of basement flooding 6708 West Park Drive Water reached window well during Agnes 6703 25th Avenue Agnes caused 7 feet of basement flooding 4515 34th Street Basement flooding Agnes - 8 feet David - 3 feet 4527 34th Street Basement Flooding Agnes - 8 feet 4513 34th Street Frequent basement flooding 6720 West Park Drive Basement Flooding - Agnes 6609 24th Avenue Basement Flooding - Agnes 6710 25th Avenue Water surrounded house during Agnes 6604 24th Place Basement Flooding 112 feet - Agnes 6415 24th Place Frequent basement flooding 5012 Rittenhouse Street Basement Flooding - Agnes 5004 Rittenhouse Street Basement Flooding - Agnes 5003 Ravenswood Place Water reached front steps during Agnes 8818 Patricia Court Frequent flooding until levee built 4223 Metzerott Road Frequent flooding until levee built C-1 APP ENDIX 11C11 2 SELECTED COMMENTS FLOODPRONE PROPERTIES Beaverdam Creek Address Comment 5203 N. Englewood Drive Water has come close to house Henson Creek 5410 Stratford Lane Frequent flooding until drainage improvements were made 2111 Calhoun Street Worst flooding has reached patio 4304 Weldon Drive No flooding has occurred since the Temple Hill Road culvert was enlarged 5920 Ladd Road Frequent backyard flooding; occasional-basement flooding up to 2 feet. 6413 Roberts Drive Frequent property flooding; no basement flooding Piscataway Creek 7802 Knollwood Basement flooding on 3 occasions Agnes, Eloise, Winter 1979 11753 Crestwood Drive Basement fl ooding - Agnes, David; maximum 2 feet in basement 4020 Floral Park Road Severe and frequent flooding Tinkers Creek 7003 Coolridge Drive Basement flooding C-2 3 APPENDIX 11C11 SELECTED COMMENTS FLOODPRONE PROPERTIES Western Branch 9103 Sheridan Court Frequent yard and basement flooding 9214 6th Street Frequent basement flooding 9219 3rd Street Severe flooding; 6 ft. in basement 8/31/81 9111 Wellington Place Flood of 8/31/81 came to house 8811 Magnolia Drive Flooded 3 times in 10 years; 4 feet in basement 8/31/81 11304 Sherington Court House has not flooded; water has come close C-3 APPENDIX "D" INVENTORY OF FLOODPRONE STRUCTURES I APPENDIX "DII LIST OF FLOOD PRO14E AREAS S T R U C T U R E E L E V A T 1 0 N lst Floor 100-year ---- ----- _TYPE -ADDRESS (FT M.S.L.) (FT M.S.L. ANACOSTIA RIVER NORTHWEST BRANCH Residential 3400 Allison Street, Brentwood, MD 20722 27 3404 If It If 3406 11 11 3408 11 it If 3410 'If 3412 #1 3401 if 3403 11 It 3405 If if 3407 It If 3409 3413 3415 it If 3417 It 3500 3504 if 3506 3508 It 3501 If 11 it 3503 if 3505 3507 3600 It 3602 3604 it 3606 11 3603 If 11 If Residential 2518 Amherst Road, Adelphia, MD 20783 65 Residential 3201 Arundel Road, Mt. Rainier, MD 20822 28 Residential 2521 Avalon Place, Adelphi, MD 20782 51 Residential 3316 Buchanan St., Mt. Rainier, MD 20822 31 3318-3328 Buchanan St., Mt. Rainier, MD 20822 If 3314-3324 Buchanan St., Mt. Rainier, MD 20822 3331-3337 Buchanan St., Mt. Rainier, MD 20822 Residential 3300-3304 Chauncey Pl., Mt. Rainier, MD 20822 32 3306-3310 11 If 11 3259-3263 If 3312-3316 3318-3320 If It 3322-3328 If 3330-3338 D-1 L IL S T OF FL 0 0 r; ID-7, A R E A S T S T R U C T U R E P LE V A T 1 0 N Ist Floor 100-yea TYPE ADDRESS (FT M.S.L.) M.S.I. Residential 3200-3214 Chillum Rd., Mt. Rainier, MD 20822 32 3204-3216 11 . 11 3218-3234 If 11 3350-3352 3366-3370 3360-3364 3341-3343 it Residential 2701 Nicholson St., Hyattsville, MD 20782 32 2703 If 2705 it 2707 It 2709 11 If 2711 It 11 It 2713 It If 2715 11 11 It 2717 If I[ 2719 11 11 2721 It 2723 it 2725 2727 2729 it 2731 it 2733 If Residential 31 57-3163 Queens Chapel Rd., Mt. Rainier, MO 20822 32 11 3117-3121 11 11 11 If 3123-3127 11 It 3129-3135 If it 3145-3149 If If 3137-3143 11 3220 it 3290 Residential 3300-3310 Queenstown Dr., Mt. Rainier, MD 20822 32 3301-3311 11 3304-3312 it 3305-3313 It Residential 8211 Riggs Rd., Adelphi, MD 20783 75 8401 Is 11 11 Ran2 it 11 11 LIST CF FLOOD PRONE AREAS S T R U C T U R E. E L E V A T 1 0 N Is-t. Floor I 00-yea-, TYPE ADDRESS FT M. S. L. M . S Residential 2300'Rittenhouse St., Chillum, MD 20782 49 of 2302 2304 2306 2308 if 2310 Is 2312 2314 If 2316 11 2318 Is 2320 IF 2322 to to It to 2301 go it It It 2303 If If I *. of 2305 of to If 2307 It it it If 2309 to It 91 1 2311 If 11 it 2313 If Is 2315 It Is It Residential 2301 Sheridin St., Chillum, MD 20782 51 Is . . 2303 It If If 2305 11 . 11 .11 2307 Is to It 2309 to 11 2311 to to 2313 to If 11 2 315 It it If 2401 11 IF to 1; 2403 to If It ResIdential 2405 Sheridan St., Chillum, MD. 20782 51 2507 IF It Is 2509 It of 2511 go Is of 2513 oil of 2515 of It is 2517 It It as 2519 11 If of 11 2521 If Is of If 2523 If to it .2300 If Is 11 2302 If to is 2306 of 10 2308 11 If 2402 of It If 2404 it go to Is to 2408 so to 2410 Is is D-3 LIST OF $'FLOOD PRONE AREAS S T R U C T U R E E L E V A T 1 0 N Ist Floor 100-ve TYPE ADDRESS (FT M.S.L.) (FT M.S. Residential 2513 Van Buren St., Chillum, MD 20782 51 If 2515 11 11 11 If 2517 [1 81 11 it 2519 It If 2516 It 2518 if 2520 It ResidentiaT @404 Webster St., Brentwood, MD 20722 28 it 3408 to 11 11 If. 3410 11 it :1 3412 19 11 3401 11 it 3403 If 3407 3409 It It 3413 It Residential 6700 West Park Dr., Chillum, MD 20782 65 11 . 6702 - 11 11 11 it 6704- 11 6706 to 6708 If If of 6710 is 1.1 6712 If Is if 6714 It 6716 If 6718 of U 6720 ffesidentia*1' 6802 West Park Dr., Chillum, MD 20782 65 If 6804 Residential 7706 West Park Dr., Adelphi, MO 20783 65 11 7708 if of It to 7710 to 7703 of 7705 it 77-07 If 7711 D-4 LIST OF FLOOD PRONE AREAS S T R U C T U R E E L E V A T 1 0 N Ist Floor 100--yea@ TYPE ---.-,------A-DDRE.SS (FT M.S.L.) (FT M.S.L. Residential 3400 Windom'St., Brentwood, MD 20722 27 it 3402 to 3404 Is 3406 If it to 11 3408 If If 11 3410 it it 3403 If 3405 If 3407 #1 If 3409 If it if 3411 of It 3413 It if 3415 of It 3500 If Residential 2513 Woodberry St., Adelphi, MD 20783 65 Residential 6603 23rd Ave., Chillum, MD 20782 51 11 6605 11 It 6607 Is 6609 If If Resident-ial 6602 23rd Place, Chillum, MD 20782 51 6604 If It 6606 6608 If 6601 at 6603. to If Is 6605 If is is it 6607 is of 1# 6609 It if 6611 It to AVe., -k-e-s i-d -en-t i a 1 6602 24th Chillum, MD 2,0782 53 6604 11 to 11 660.6 to Residenti@]" 6608 24th Ave., Chillum, MD 20782 53 11 . 6610 11 11 of If 6612 If to - If 6603 to 6605 If 6607 If Is 6609 41 If If 6611 to 11 If 6613 Is It 11 6615 to is to 6617 to D-5 LIST OF FLOOD PRONE AREAS S T R U C T U R E E L E V A T 1 0 N lst Floor 100-ye,. TYPE ADDRESS (FT M.S.L.) (FT M.S.1 Residential 6602 24th Place, Chillum, MD- 20782 51 6604 it 6606 It 6608 If It It 6610 6612 If 6614 If 6616 If it 6618 If 6620 If 6603 It 6605 if 6607 If 6609 11 it 6611 It to 6613 If Is to Is 6615 it If of It 6617 It of It 6619 it It 6621 If It IN Is 6623 If to 6625 Residential' 6700 25th Avenue, Chillum, MD 20782 59 6702 IN It 6704 If. 6706 If at 67 08. It of it 6710 6701 If If 6703 if it 6705 It 6707 Is -------- 11 6709 fill it It 6711 at Is It 6713 11 to it 6715 11 If it Residential 4704 31st Pl., Mt. Rainier, MD 20822 28 D-6 LIST OF FLOOD PRONE AREAS S T R U C T U R E E L E V A T 1 0 N st Floor 100-yeE TYPE ADDRESS (FT M.S.L.) (FT _M-S-L Residential 4519 32nd St., Mt. Rainier, MD 20822 28 4521 4523 4525 4527 If 4529 If 11 4531 4518 If 4520 4522 4524 4526 4528 If 4530 If Residential 4501 34th St., Brentwood, MD 20722 28 4503 11 11 If 4505 If If 4507 11 4509 If 4511 4513 4515 4523 4527 If 4529 If It 4528 11 4530 4532 4601 4603 4605 Residential 4600 37th St., Brentwood, MD 20722 27 Commercial 5390 Ager Rd., Hyattsville, MD 20782 32 5620 5950 6000 6002 If D-7 LIST OF FLOOD pqr',.- AR"AS S T R-U T U R E E L E V A T 1 0 N Ist Floor 100-yea TYPE ADDRESS (FT M.S.L.) (FT M.S.L Commercial 2486-2490 Chillum Rd., Chillum,. MD.20782 32 2426 2430 If 2440 2460 2464 If If 2490 it If 2400 If 2310-2314 If 2222 It if 2309 11 it 2130 It. Commercial 1901 Hamilton St., Hyattsville, MD 20822 32 11 2001 11 11 it 2781 2801 Commercial 3171-3191 Queens Chapel Rd., Mt. Rainier, MD 20822 32. 3100-3130 Commercial 2500-2520 University Blvd., Adelphi, MD 20783 65 2400-2426 11 11 2501 If 2503 2505 If 2507 11 2509 2511 D-8 LIST OF FLOOD PRONE AREAS S T R U C T U R E E L E V A T 1 0 N lst Floor 100 year TYPE ADDRESS (FT M.S.L.) (FT_M.S.L SLIGO CREEK Residential 2001 Oglethorpe St., Chillum, MD 20782 46 2003 2000 2002 Residential 1903 Oliver St., Chillum, MD 20782 46 1905 1907 1909 1911 If 1913 1915 2003 2005 2007 If 2009 2002 If 2004 2006 2008 Residential 2001 Peabody St., Chillum, MD 20782 46 2003 it 2005 2007 2000 it 2002 it It It 11 2004 11 11 If 2006 If 11 2008 11 Residential 2003 Powhattan Rd., Chillum, MD 20782 46 2005 It 11 it 2007 It 2000 2002 2004 If to If 1901 11 it It 1903 it 11 1905 It 1907 11 1909 It It 1902 11 1904 it Residential 2001 Rittenhouse St., Chillum, MD 20782 52 2003 If D-9 LIST OF FLOOD PRONE AREAS S T R U C T U R E E L E V A T 1 0 N lst Floor 100 yeai TYPE ADDRESS (FT M.S.L.) (FT M.S kes-i dential' 2005 Rittenhouse St., Chillum, MD 20782 52 2007 11 2009 2011 2000 2002 2006 If 2010 It 2012 If Residential 2007 Roanoke St., Chillum, MD 20782 52 2009 2011 2013 If 2000 If 2002 11 2004 It 2006 If 2008 2010 2012 2014 1900 1902 If. Residential 6021 Sligo Parkway, Chillum, MD 20782 46 6023 it 11 it 6025 it 6027 6029 It 6103 6105 it it 6107 11 6201 If 6203 it 6205 If 6207 it If 6209 6211 Ul 3. 6215 6217 it 6219 6221 If 6223 If 6225 it 6227 6229 D-lo LIST OF FLOOD PRONE AREAS S T R U C T U R E E L E V A T 1 0 N lst Floor 100 year TYPE ADDRESS (FT M.S.L.) (FT M.S-@ Resi:dent.fal 6231 Sligo Parkway, Chillum, MD 20782 46 6233 11 11 11 6303 52 6305 11 6307 6309 6311 6313 If 6315 If 6317 6319 If 6321 6323 6403 6405 If If 6407 6409 6411 6413 6415 6417 6501 59 6503 6505 6507 6509 6511 Residentiai 2000 Somerset St., Chillu m, MD 20782 52 It 2002 11 2004 If 2006 2001 2003 2005 If 2007 Residential 2000 Tucke rman St.,.Chillum, MD 20782 59 2002 If 2004. 11 2006 If 2001 2003 2005 2007 it Residential 6020 20th Ave., Chillum, MD 20782 46 to 6022 11 11 If It 6024 If it D-11 LIST OF FLOOD PRONE AREAS* S T R U C T U R E E L E V A T 1 0 N lst Floor 100 year TYPE ADDRESS (FT M.S.L.) (FT M.S. Residential 6102 20th Ave., Chillum, MD 20782 46 6104 6106 6200 6202 6204 6206 6212 6214 6216 If It .6218 If 6220 6222 it 6224 6226 6228 6230 If it 6302 if It 11 6304 It It If 6306 6308 6310 It 6312 11 6021 If 6023 it It 6025 11 11 6027 If it 6103 6201 6203 6207 6209 If 6211 6213 it 6215 6217 -6219 6221 If 6223 it 6225 6227 6314 52 6316 It 6318 6320 If 6322 If IV: 6402 It 6404 D-12 LIST OF FLOOD PRONE AREAS' S T R U'C T U R E E L E V A T 1 0 N lst Floor 100 year TYPE ADDRESS (FT M.S.L.) (FT M.SJ Res-id'entfal 6406 20th Ave., Chillum, MD 20782 52 6408 6410 6412 6414 If 6500 59 6502 6504 If 6506 6508 6510 Residential 6200 20th Place, Chillum, MD 20782 46 6202 11 6204 If 6206 6208 6210 6212 6214 6216 6218 If 6220 If 6224 6226 6228 6201 6203 6205 6207 If 11 6209 If it 6307 59 6315 of 6403 6409 6503 it -65b5 If 6507 D-13 LIST OF FLOOD PRONE AREAS S T R U C T U R E E L E V A T 1 0 N lst Floor 100-yeai, TYPE ADDRESS (FT M.S.L.) (FT M.S.L. .-Residential 2000 Sheridan St., Chillum, MD 20782 52- If 2002 1) 2004 2006 2001 2003 2005 2007 it it Residential 2000 Ravenswood St., Chillum, MD 20782 52 2002 At it 2004 If 11 2006 If 2001 2003 2005 D-14 LIST OF FLOOD PRONE AREAS S T R U C T U R E E L E V A T 1 0 N lst Floor 100 year TYPE ADDRESS (FT M.S.L.) (FT-Ki-_S.L NORTH EAST BRANCH Residential 4908 East-West Hwy., Riverdale, MD 20840 29 Residential 5309 Greenway Dr., Edmonston, MD 20781 21 11 5311 11 11 11 Residential 5311 Patterson Rd., Riverdale, MD 20840 29 If 5313 11 11 5315 If 5317 5312 If 5314 5316 5318 5320 Residential 5301 Powhatan St., Riverdale, MD 20840 29 5303 11 11 If 5305 11 If 5307 5311 5313 Residential 5414 Quesada Rd., Riverdale, MD 20840 29 11 5422 11 11 11 Residential 5301 Quintana St., Riverdale, MD 20840 29 5303 If 5305 11 5302 If Residential 4909 Ravenswood Rd., Riverdale, MD 20840 29 If 4911 of 11 4913 If 5003 11 5005 If 5007 5009 If 5011 11 5004 5006 5008 If 5010 11 5012 Residential 5000 Rittenhouse St., Riverdale, MD 20840 29 11 5002 11 11 11 5004 5006 D-15 LIST OF FLOOD PRONE AREAS S T R U'C T U R E E L E V A T 1 0 N lst Floor 100 yeai TYPE ADDRESS (FT M.S.L.) (FT M.S Re,sidential* 5008 Rittenhouse St., Riverdale, MD 20840 29 5012 Residential 5306 Riverdale Rd., Riverdale, MD 20840 25 If 5308 It 11 5312 it 5314 5316 5318 5320 it 5322 5324 Residential 5006 Sheridan St., Riverdale, MD 20840 31 5008 11 5010 5012 5005 5007 It it 5009 It 5011 5013 It Residential 5005 Somerset Rd., Riverdale, MD 20840 31 1) 5007 11 5009 Residential 6303 Taylor Rd., Riverdale, MD 20840 29 6305 11 11 6311 6313 6315 If 6317 If Residential 5007 Tuckerman St., Riverdale, MD 20840 33 5011 5013 5015 5017 5012 5014 5016 If it. 5018 If 5020 11 If Residential 6120 54th Ave., Riverdale, MD 20840 25 11 6122 11. 11 11 6124 6126 6200 6202 6204 D-16 LIST O.FFLOCD PRONE AREAS S T R U C T U R E E L E V A T 1 0 N Ist Floor 100-y-ar TYPE ADDRESS (FT M.S.L.) (FT M.S.L. Commercial 6250-6270 Kenilworth Ave., Riverdale, MD 20737 31 6300 11 11 6322-6324 6328 6408 It 11 it 6410 11 6504 33 6510 11 6600 It It 6715 It 6801 It D-17 LIST OF FLOOD PRONE AREAS S T R U C T U R E E L E V A T 1 0 N Ist Floor 100 yeav TYPE ADDRESS - (FT M.S.L.) (FT M.S.L INDIAN CREEK Residential 5101 Cleveland Ave., College Park, MD 20740 52 If 5402 11 11 11 5500 5502 5519 Residential 4906-Navahoe St., College Park, MD 20740 60 4910 11 5009@ 58 5011 It 5013 5101 If 5103 11 5105 If 5107 11 5109 If 5004 11 5010 If 5014 If it 5100 11 5106 5108 5110 5112 it 5114 11 5116 it 5118 If 5120 11 5122 it it 5124 If If 5126 It 11 Residential 2000 Ravenswood St., Chillum, MD 20782 52 2002 to 2004 it 2006 2001 If- 2003 2005 of It Residential 5500 Richmond Ave., College Park, MD 20740 50 Residential 2000 Sheridan St., Chillum, MD 20782 52 2002 2004 D-18 LIST OF FLOOD PRONE AREAS S T R U C T U R E E L E V A T 1 0 N lst Floor 100 year ---TYPE ADDRESS (FT M.S.L.) (FT M.S. R-esfdential 2006 Sheridan St., Chillum, MD. 20782 52 2001 2003 2005 2007 If It Residential 8000 51st Ave., College Park, MD '20740 65 8002 If if if 8006 If 8001 Ob 8003 If It It 8012 ic Is 8108 of It 8105 cc 8.111 If 8113 8115 It 8117 If Residential 8002 54th Ave., College Park, MD 20740 64 it 8004 11 11 If 8006 11 It it 8008 If of it Commercial 5502 Albany Ave., College Park, MD 20740 52 5504 11 11 11 5507 It Commercial 5503 Atlanta Ave., College Park, MD 20740 52 If 5505 It If Commercial 5107 Berwyn Rd., College Park, MD 20740 54 5111 11 If DO 5113 it Is ED 5119 Is' at 51-13 is It 5115 Is If 5117 If Commercial 4905 Navahoe St., College Park, MD 20740 60 if 11 If 5134 58 Commercial 8100 Rhode Island Ave., College Park, MD 20,740 58 Commercial 8005 51st Ave., College-Park, MD 20740 65 Commercial 8300 54th Ave., College.Park, MD 20740 65 D-19 -LIST OP FLOOD .'PRONE AREAS STRUCTURE ELEVATION Ist Floor 100-yeai TYPE ADDRESS (FT M.S.L.) (FT M-SA PAINT BRANCH Residential 9002 Bote'ler Lane, College Park, MD 20740 78 9006 If 11 9007 it If 9041 Residential 4800 Lakeland Rd., College Park, MD 20740 58 4802 11 11 4808 it 4812 4900 4902 5002 60 5004 5008 5013 5014 it 5015 5016 5019 It 5021 5022 If If 5100 it 64 5102 11 11 5103 If 5104 It It 5108 it 5109 5110 5111 Residential 4101 Metzerott Rd., College Park, MD 20740 75 4103 4105 4109 If 4201 11 11 4203 it If It 4221 4223 Residential 8802 Patricia Court, College Park, MD 20740 75 If 8804 11 8806 8808 If 8810 11 It 8812 If It D-20 LIST OF FLOOD PRONE AREAS. S T R U C T U R E E L E V A T 1 0 N lst Floor 100-year YPE ADDRESS (FT M.S.L.) (F-r M-,-S. L.. PAINT BRANCH Residential 8814 Patricia Court, College Park, MD 20740 75 8816 8818 8803 If 8805 11 8807 -8809 8811 If 8813 8815 8817 8819 If Residential 8000 Travis Lane, College Park, MD 20740 75 8002 If 8004 8001 8003 8005 . If of It 8007 If Commercial 4902 Calvert Rd., Riverdale, MD 20737 46 11 4917-4923 Calvert Rd., Riverdale, MD 20737 11 Commercial 4911-4917 College Ave., College Park, MD 20740 46 11 . 5001 If 5003 5005 If 5012 If Commercial 1303 Cpl. Frank Scotts Dr., College Park, MD 20740 52 6707 Commercial 4915 Lehigh Rd., College Park, MD 20740 46 5008 If 5012 4908-4914 3838 University Blvd., College Park, MD 20740 78 Commercial 4925 50th Ave., College Park, MD 20740 52 11 7410 If 7415 Commercial 5018 Lakeland Rd., College Park, MD 20740 60 D-21 LIST OF FI-C00 PRONE JAREAS E L E V A T 1 0 N S,T R U C T U R E Ist Floor 100 YE TYPE ADDRESS (FT M.S.L.) FT M. BEAVER DAM Residential 2400 Beaver Road, Kent Village, MD 20785 41 11 2130 If 11 of 2120 Residential 6401 Country Club Court, Kent Village, MD 20785 54 Is 6403 11 #1 it it 6400 If 11 is 6405 it 11 .6402 Residential 2707 Country Club Rd., Kent Village, MD 20785 54 If 2715 if 2717 41 2723 is 2727 If If 2701 11 Residential 1600 Englewood Ave., Cheverly, MD 20785 31 If 1602 it It 11 11 1604 11 11 11 11 1603 11 11 1605 if Residential 2708 Hawthorne Terrace, Kentland, MD 20785 53 2710 91 11 If 2712 It 2714 Is If 19 if 2716 2718 2720 at 2722 If If to Residential 5314 N. Englewood Dr., 'Cheverly, MD 20785 33 If 5210 to of 32 91 5212 5214 If It 521.6 11 If If It 5218 It If It 5201- Is 11 5203 11 of to It It it 5205 it 11 If 5300 33 -i'302 It it it It it 5304 5306 to 19 If 5207 11 11 32 5108 It 11 11 It Is It D-22 LIST OF FLOOD PRONE AREAS S T R U C T U R E E L E V A T 1 0 N lst Floor 100-yea TYPE ADDRESS (FT M.S.L.) (FT M. S. L R@sid'entia'f 2600 Pinebrook Ave., Kentland,.MD 54 11 2602 Is Is It it 2604 It so 11 2606 to 2608 13 2610 it Residential 1810 61st Ave., Cheverly, MD 20785 35 1812 11 11 11 1814 11 It of 1817 to to 1815 It 1813 It 1808 11 1811 Is Residential 1814 62nd Ave., Cheverly, MD 20785 .37 1812 1810 Is 1815 1813 1811 1808 If it it 1809 Commercial 8121 Ardwick Ardmore, Rd., Ardwick Industrial Park 75 8201 Commercial 5800 Columbii Park Rd., Cheverly, MD 20785 41 if 5801 14 it 5720 40 Is 5718 If of 5716 11 Commercial 5700 Columbia Park Rd., Cheverly, MD 20785 35 It 5620 11 11 it 5618 11 is If 5610 If 5600 11 5701 Commercial 7229 Country Club Rd., Kentland, MD 207805 54 11 7233 11 If to 16 7241 It to it It 72-243 to is it of . 7245 .16 It it 72491. It i 7301 D-23 LIST OF FLOOD PRONE AREAS S T R U C T U R E E L E V A T 1 0 N lst Floor 1 00-ye-;: TYPE ADDRESS (FT M.S.L.) (FT M.S.! 15 %lomr-nercial 6900 Old Landover Rd., Kentland, MD 20785 6907 If . 11 6911 It it 7000 to 11 7100 If Comme rc i al 3101 Pennsy Dr. , Kentland, MD 20785 53 3120 it 3133 If 3137 If it 3301 It is 3300 it It D-24 LIST OF FLOOD PRONE AREAS Sj R U*C T U R E E L E V A T 1 0 N Ist Floor 100 yeai TYP E -AD-P-RESS - -- ------ (FT M.S.L.) -JFT M.S, OXON RUN Residential 507 Drum Ave., Capitol Heights, MD 20027 140 140 509 ljq 142 511 142 142 Residential 2430 Green Valley Dr., Suitland, MD 20023 153 2428 155 2426 157 2424 2422 154 .2420 LIST-01c' FLOOC PRONE AREAS S T R U C T U R E E L E V A T 1 0 N Ist Floor 100 ye@ TYPE ADDRESS (FT M.S.L.) (FT M.! HENSON CREEK Residential 4004 Beachcraft Ct., Temple Hills, MD 20031 160 11 4006 It it U if 4008 If 91 Is 4012 if 11 4010 Is Is 4003 If 4005 11.1 Residential 7102 Bock Rd., Oxon Hill 20022 81 7104 If Residential 3701 Brinkley Rd., Temple Hills, MD 20031 121 If 3504 It 11 it Is 3500 Is It Residential 2103 Calhoun St., Oxon Hill, MD 20022. 82 If 2105 Is It 11 2107 It 2109 2111 2113 2201 If 2203 11 2205 It if If 2207 it 2209 of to It 2211 it to 2213 it it 2215 Is it It 2301 It If 11 2303 Is 11 11 If 2305 It 11 if at 2307 It it 11 If 2309 11 It 2311 If to Residential 4304 Canterbury Way-House, Temple Hills, MD 20031 134 Residential 4609 Eaton Dr., Marlow Heights, MD 20023 171 4611 If it 4614 It It If 4612 11 4610 19 4608 It Residential 4001 Forest Grove Dr., Suitland, MD 20023 199 4005 D-26 LIST OF FLOOD PRONE AREAS S T R U C T U R E E L E V A T 1 0 N lst Floor 100-ye TYPE ADDRESS (FT M.S.L.) (Fr M.S. -sidenti'al 4310 Hartlor I d Hills, Suitland, MD 20023- 195 4308 11 11 Is 4306 asidential 4206 Henderson Rd., Temple Hills, MD 20031 195 is 4300 11 If 11 Is 4302 If !sidential 5400 Henson Dr., Temple Hills, MD 20031 195 @sidential 7903 Indian Head Highway, Oxon Hill, MD 20745 N/A 7907 11 7911 it !sidential .8420 Indian Head Hwy., Oxon Hill, MD 20022 28 8422 If 11 8424 If 8426 11 If 8428 If Is of 8430 Is It if 8432 to 10 it 8434 !sidential 5813 Keppler Rd., Temple Hills, MD 20031 158 5817 11 Is 5814 If to 5808 11 to 5806 If 5811 If 5807 If Is 5805 It 5803 18 5801 If if 5719 If of 5717 11 It 11 5715 is If 5713 If 11 5711 of If If 5709 to *5707 of- -5705 If 5703 Is 5701 it 5519 It 560i 5607 5605 5603 D-27 LIST OF FLOOD PRONE AREAS .S T R U C T U R E E L E V A T 1 0 N Ist Floor 100-ye TYPE ADDRESS (FT M.S.L.) (FT M.@z_ Residential 5920 Ladd Rd., Suitland MD 20023 160 6003 11 is it 6005 it If 11 6007 11 if' 11 6009 to 6011 If ResIdential 5922 Ladd Rd., Suitland, MD 20023 160 6000 of 6002 6004 6006 11 If is 6008 It - 6010 Is 6012 11 If 6014 If 11 It 6016 11 if I If of 6018 Is If to Residential 9101 Livingston Rd., Oxon Hill, MD 20022 28 Residential 4901 Meadowbrook Dr., Suitland, MD 20023 175 4902 If 19 If Residential 4101 Offut Dr., Suitland, MD 20023 175 If 4103 11 it of 4100 Is It Residential 5402 Old Temple Hill Rd., Temple Hills, MD 20031 125 If 5400 If Is It of 5413 5411 of 5409 5600 to 4356 If If of Residential 902 Palmer Rd., Oxon Hill, MD 20022 35 Residential 6415 Roberts Dr., Temple Hills, MD 20031 121 6413 If 6409 Is 6405 if 11 .6411 to 11 6407 It . It * If 6403 if Residential 5410 Strafford Lane, Temple Hills, MD 20031 158 5408 5406 If It to 5404 11 5402 is 5400 is 5312 Is 5310 to Is LIST OF FLOOD PRONE AREAS S T R U C T U R E E L E V A T 1 0 N lst Floor 100-yea TYPE ADDRESS (FT M. S. L. FT S. L Risid6ntidl' 6206 Suitland Rd., Suitland, MD 20023 195 If 6208 Residential 5515 Temple Hills Rd., Temple Hills, MD 20031 134 to 5601 Is 11 It 5603 111, If 01 5607 It 5410 it 5412 Residential 4300 Weldon Dr., Temple Hills, MD 20031 153 to 4302 11 to If 4304 It to 4306 to It 4308 to it is 4310 Is If It 19 If Is 11 4312 It 4314 If It It 4316 it It Residential 501-507 Wilson Bridge Dr.*, Oxon Hill, MD 20745 It 509-515 11 517-523 It 525-531 It 533-539 541-547 549-555 It It it 557-563 11 11 565-573 D-29 LIST OF FLOOD PRONE AREAS S T R U C T U R E E L E V A T 1 0 N lst Floor 100-ye TYPE ADDRESS (FT M.S.L.) (FT_M.S. Residential 6211 Woodland Rd., Suitland, MD 20023 175 it 6301 11 11 6303 of 6305 to 6307 It 6311- It it 6401 It 6405 11 it 6409 It If If If 6411 It If 6415 It of 6417 11 It 6419 It It it 6501 It It It It 6505 to It It If 6509 It It It It 651 5 11 if 6517 6519 #1 6600. 6602 6604 if 6606 It 6608 It If to 6610 it it 11 6612 It It if 6614 It of it It If 6616 6618 Is If it 6620 Is 1, 6622' It 6700 it D-30 LIST O= FLOOD PRONE AREAS E L E V A T 1 0 N S T R U'C T U R E 1st Floor 100 yea@ -T-YPE ADDRESS (FT M.S.L.)_ (FT M.S. 8500 Indian Head Hwy., Oxon Hill, MD 20022 28 Commercial 9100 Livingston Rd., Oxon Hill, MD 20022 28 9116 If Is 9011 of 9001 If Commercial 5007 Meadowbrook Dr., Suitland, MD 20023 175 Commercial 4625 Old-Branch Ave., Temple Hills, MD 200311 171 if 4600 Commercial 6101 Suitland Rd., Suitland-1. MD 20023 195 6200 Commercial 709 Taylor Acres Ave., Oxon Hill, MD 20022 18 D-31 LIST OF FLOC)D PRONIE.' AREAS S T R U C T U R E ELEVATIOIN Ist Floor 100 V e a TYPE ADDRESS (FT M.S.L.) Vi @ (FT TINKERS CREEK Residential 6901 Coolridge Dr., Suitla.nd, MD 20031 11 6907 11 . of 7007 It It 7003 It It Commercial 6709 Branch Ave., Suit-land, MD 20031 It -6711 It It It of Commercial 6805 Coolridge Dr., Suitland, MD 20031 11 6807 11 it 6809 at 6813 It it 6815 Is It It 6817 at D-32 LTS'r OF FLOOLD, PRONIE ArEAS I S T R U C T U R E E- L E V A T 1 0 N lst Floor 100. ycar TYPE ADDRESS (FT M.S.L.) LF, ji_-M . S-,..L . PISCATAWAY Residential 11729 Crestwood Ave., North Clinton, MD 20613 110 11737 11741 11745 If it If 11749 It 11753 If Residential 3006 Floral Park Rd., Clinton, MD 20613 34 3106 3402 3410 If. 3500 3611 3701 If 3708 11 3710 If 3711 11 If 3805 11 11 3806 4001 4006 4020 Residential 7800 Knollwood St., Brandyviine, MD 20613 110 If 7802 11 11 7803 11 7804 If 7805 11 If it 7806 If 11 7807 11 If 7808 11 11 7809 11 It It it 7810 If it If 7811 11 11 7812 7813 7815 If It 7901 If It Residential 13512 Livingston Rd., Accokeek, MD 20022 17 13514 it U 13515 If D-33 LIST OF FLOOD PRONE AREAS S T R U C T U R E E V A T 1 0 N lst Floor 100-year TYPE ADDRESS (FT M.S.L.) (FT M.S.L. PISCATAWAY (cont'd) Residential 13516 Livingston Rd., Accokeek, MD 20022 17 13600 11 13604 It 13606 13711 13712 13801 13809 It 14001 13401 Piscataway Rd., Clinton, MD 20613 34 7600 Redwood Ct., Brandywine, MD 20613 118 7601 if 7602 7603 -7604 7605 7606 Residential 11708 Redwood Dr.,.Brandywine, MD 20613 118 11712 11713 It 11716 11 11 11717 It It 11720 it It 11721 If It 11724 It 11725 it 11728 11729 11733 11801 Residential 3604 Taylor Circle, Ft. Washington, MD 20022 18 13001 Winebrook Dr., Clinton, MD 20735 .44 Commercial 11700 Brandywine Rd., Clinton, MD 20613 94 D-34 LIST OF FLOODIRON'E AREAS S -1 R U C T U R E E L E V A T 1 0 N Ist Floor 100-year TYPE ADDRESS (FT M.S.L.) FT M..S.L. PATUXENT Residential 17001 Annapolis Rd., Annapolis, Md. 20715 43 Residential 26 Avondale St., Laurel, Md. 20811 148 Residential 12921 Brock Bridge Rd., Laurel, MD 20811 116 12923 12925 If 12927 12929 12931 12909 12911 12913 If 12915 12917 12919 12901 12903 12905 12907 12935 12937 12939 If It 12941 Residential 23100 Crispus Attucks Blvd., Eagle Harbor, MD 20608 7 23102 23106 23110 22907 If Residential 319 Main St., Laruel, MD 20810 148 Residential 8400 McClure Rd., Upper Marlboro, MD 20772 9 Residential 9305 Montpelier Dr., Laurel, MD 20811 116 9307 11 11 11 9309 it 9306 If 9308 If It 9310 Is 9312 it 9314 If D-35 LIST OF FLOOD PRONE AREAS STRUCTURE lst Floor I 00-yea TYPE ADDRESS (FT M. S. L. (FT M.S.L PATUXENT Residential 22803 Paul Sunbar Ave., Eagle Harbor, MD 20608 7 22900 22907 22908 23001 23003 it If 23100 it Residential 5802 Green Landing Rd., Upper Marlboro, MD 20772 9 5902 If Residential 17400 River Airport Rd., Brandywine, MD 20613 8 Residential 7100 Route 301(NW), Annapolis, MD 20715 43 7110 11 11 7111 Commercial 26.Avondale St., Laurel, MD 20810 148 42 Commercial 20 Baltimore Blvd., Laurel, MD 20810 146 11 30 It 42 Commercial 9701 Ft. Meade Rd., Laurel, MD 20810 145 9703 11 11 11 9705 it 11 11 9707 If If if 9709 9711 It 9713 If 9715 9717 If 9719 11 9721 If If 9723 9725 9727 It It 9729 9731 D-36 LIST OF FLOOD PRONE AREAS S T R U C T U R E E L E V A T 1 0 N Ist Floor 100-year TYPE ADDRESS (FT M.S.L.) (FT M.S.L.- PATUXENT Commercial I Main St., Laurel, MD 20810 148 9 19 21 If 22 If 99 11 100 If If 101 103 If 105 If 109 ',1 311 313 If 315 [1 317 If it 351 It If 353 It 355 357 359 361 363 If 365 If 367 If 369 If 11 371 If 373 Commercial 1 2nd Ave., Laurel, MD 20810 145 D-37 LIST OF FLOOD PRONE AREAS S T R U C T U R E E L E V A T 1 0 N lst Floor 100-yeat TYPE ADDRESS (FT M.S.L.) (FT M.S.L WESTERN BRANCH BALD HILL Residential. 6109 C St., Seabrook, MD 20706 137 6110 Residential 9213 Lanham Severn Rd., Seabrook, MD 20706 136 9215 if 9217 9305 Residential 8810 Magnolia Dr., Seabrook, MD 20706 142 11 8811 11 If 11 Residential 9103 Sheridan Ct., Seabrook, MD 20706 137 if 9104 Residential 9201 Wellington Ct., Seabrook, MD'20706 9203 If 9111 Wellington Pl., SeabrookMD 20706 9113 11 11 9115 if If 9117 If 9119 Residential 9216 3rd St., Seabrook, MD 20706 If 9217 9219 If Residential 9219 4th St., Seabrook, MD 20706 9225 if 11 If 9226 It 9227 If If 9217 5th St., SeabrookMD 20706 9209 6th St., Seabrook, MD 20706 9212 It 9214 If D-38 LIST OF FLOOD PRONIE AREAS S T R C T U R E E L E V A T 1 0 N lst Floor 100--year TYPE ADDRESS (FT M.S.L.) FT M,S.L. FEDERAL SPRING Residential 13011 Old Marlboro Pike, Upper Marlboro, MD 20772 12 11 13013 14003 If 37 14005 If 14007 14009 Commercial 14011 if 14015 11 if FOLLY BRANCH Residential 10321 Buena Vista Ave., Lanham, MD 20706 118 10234 Chautauqua.Ave., Lanham, MD 20706 118 10236 11 if 11 10300 If It If 5633 Hiland Ave., Lanham, MD 20706 Residential 10800 Lanham-Severn Rd., Lanham, MD 20706 134 11 10802 11 If 10804 If 10805 If Residential 10707 Larch Dr., Glenn Dale, MD 20769 134 10711 5636 Lincoln Ave., Lanham, MD 20706 118 5730 11 11 It If 7401 Northern Ave., Glenn Dale, MD 20769 134 7409 11 11 7413 D-39 LIST OF FLOOD PRONE AREAS S T R U C T U R E _E L E V A T 1 0 N lst Floor 100-yeai TYPE ADDRESS (FT M.S.L.) (FT M.S.L, FOLLY BRANCH (cont'd) Residential 9902 Poplar St., Lanham, MD 20706 118 9903 9906 Residential 10706 Potomac St., Glenn Dale, MD 20769 134 10708 6507 Woodstream Dr., Lanham, MD 20706 140 Commercial 10802 Lanham-Severn Rd., Lanham, MO 20706 134 10804 it 10806 11 7317 NorthernAve., Glenn Dale, MD 20706 COLLINGTON BRANCH Residential 4712 Largo Rd., Upper Marlboro, MD 20772 30 15117 15119 15202 32 15204 15206 15208 Residential 15728 Pointer Ridge Dr., Upper Marlboro, MD 20772 30 15730 11 it 15732 15734 it Comme-rcial 6000 Laurel Bowie Rd., Bowie, MD 20716 145 D-40 LIST OF FLOOD PRONE AREAS STRUCTURE ELEVATION lst Floor 100--year i@ 1 11. TYPE ADDRESS (FT-M.S.L.) (FT MII TURKEY BRANCH Residential 3130 Pyles Dr., Upper Marlboro, MD 20772 82 11 3131 H 3133 2600 Ritchie-Marlboro Rd., Upper Marlboro, MD 20772 108 CABIN BRANCH Residential 3508 Brown Station Rd., Upper Marlboro, MD 20772 38 NORTHEAST Commercial 12211 Central Ave., Upper Marlboro, MD 20772 78 SOUTHWEST BRANCH Residential 1212 Darlington St., Forestville, MD 20028 148 1214 Residential 10304 New Orchard Dr., Upper Marlboro, MD 20772 88 2017 Marbury,Dr., District Heights, MD 20028 198 10402 Rambling Hill Ct., Upper Marlboro, MD 20772 83 10404 1514 Ritchie Rd., Forestville, MD 20028 162 1504 Shady Glenn Dr., District HeightS, MD 20027 180 D-41 LIST OF FLOOD -'r-Ro%,E AREAS S T R U C T U R E E L E V A T 1 0 N lst Floor 100-year TYPE ADDRESS (FT M.S.L.) (FT M.S.L. SOUTHWEST BRANCH (cont'd) Residential 11302 Sherrington Ct., Upper Marlboro, MD 20772 72 11304 Residential 11102 Webbwood Ct., Upper Marlboro, MD 20772 74 11 11104 If 11106 it 11108 11110 11112 If 11114 11105 11109 It it Residential 11014 Woodlawn Blvd., Upper Marlboro, MD 20772 74 Commercial -8617 Central Ave., Capitol Heights, MD 20027 120 9001 it 9005 If 9033 If If 9101 it 9171 11 9175 If 9179 it 9181 9183 9185 9195 If Commercial 401 Old Ritchie Rd., Forestville, MD 20028 128 407 11 11 11 408 If WESTERN (MAIN STEM) Residential 14946 Main St., Upper Marlboro, MD 20772 30 11 14948 11 11 If If 15104 If D-42 LIST OF FLOOD PRONE AREAS S T R U C T U R E E L E V A T 1 0 N Ist- Floor 100-year TYPE ADDRESS (FT M.S-L.)___(FT M.S.L. WESTERN BRANCH (MAIN STEM) cont'd) Residential 15106 Main.St., Upper Marlboro, MD 20772 30 15108 If 15109 15115 it 15220 it 15224 15226 It 15241 15242 If 15243 it .[I 15246 it 11 15247 If 15248 15100 Peerless Ave., Upper Marlboro, MD 20772 15102 15104 Commercial 11801 Chesterton Dr., Upper Marlboro, MD 20772 If 15400 Chrysler Dr., Upper Marlboro, MD 20772 15410 If 5200 Way, Commercial 5300 Crain Highway, SE, Upper Marlboro, MD 20772 30 5301 5701 Crain Highway, SW,.Upper Marlboro, MD 20772 30 5707 5715 5717 5719 5721 5723 5725 5727 5731 If 5733 11 If I 5735 If I; D-43 LIST OF FLOOD ;@@RONE AREAS S T R U C T U R E E L E V A T 1 0 N lst Floor 100-year TYPE ADDRESS (FT M.S.L.)___(FT M-.--S-.L. WESTERN BRANCH (MAIN STEM) Commercial 5737 Crain Hwy., SW, Upper Marlboro, MD 20772 30 If 5739 it 5741 5743 5745 5747 it 5749 If it 5751 11 11 5753 it It it 5755 It 5757 11 5759 If It If 6000 Crain Hwy., SE, Upper Marlboro, MD 20772 30 of 6600 11 11 11 Commercial 5401 Douglas St., Upper Marlboro, MD 20772 If 5407 5405 East Court Dr., Upper Marlboro, MD 20772 30 5409 If 5411 11 5413 it 14741 Gov. Oden Bowie Dr., Upper Marlboro, MD 20772 30 14735 Main St., Upper Marlboro, MD 20772 30 14940 Main St., Upper Marlboro, MD 20772 15004 Marlboro Pike, Upper Marlboro,-MD 20772 15005 If 15006 If 15008 15011 151-03 If 15113 15117 15200 15201 15203 15204 If 15205 D-44 LIST OF FLOODPRONE AREAS S T R U C T U R E E L E V A T ION lst Foor 100-year TYPE ADDRESS (FT M.S.L.) (FT M,S.L. WESTERN BRANCH (MAIN STEM) Commercial 15207 Marlboro Pike, Upper Marlboro, MD 20772 30 15209 If 15211 15213 if 15222 15225 If if 15301 11 1, If 15305 If if if 15315 E 15055 Commercial 14811 Pratt St., Upper Marl-boro, MD 20772 30 11 14815 11 It It Commercial .5404 Water St., Upper Marlboro, MD 20772 30 5415 11 11 It 5700 5408 West Court Dr., Upper Marlboro, MD 20772 30 *Some structures contain multi-addresses of commercial or residential uses. D-45 I @ . -1 JIMMINIM11111, 3 6668 14109 4799