Appendix A. Flood Plains.  


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  • The maps and studies cited below depict areas designated as floodplain by Fairfax County. They represent only a portion of the total area of Fairfax County that satisfies the definition of floodplain in Article 20 of the Zoning Ordinance. Floodplain studies prepared in accordance with the provisions of the Public Facilities Manual which propose changes to the flood elevations and/or flooding limits shown on these maps and studies cited below may be approved by the Director of Land Development Services if physical changes have occurred which have rendered these maps inaccurate or if physical changes are proposed within the existing floodplain which meet the provisions of Part 2-900 of the Zoning Ordinance.

    (a)

    In order to implement administration of the Zoning Ordinance, there is hereby adopted the flood plains in Tripps Run and Holmes Run and their principal tributaries, specifically delineated on sheets numbered 1 to 14 and 27 to 46, inclusive, of the Report on Storm Drainage, prepared by Massey Engineers and Alexander Potter Associates, September, 1958, and contained in a report dated December, 1958, entitled, "Fairfax County, Virginia, Flood Control and Storm Drainage for Watersheds of Tripps Run and Holmes Run-Hunting Creek Drainage Basin."

    The flood plain limits designated 100C or 100-year frequency shall apply to main channels and those designated 10C or 10-year frequency shall apply to tributaries.

    Main channel flood plain limits for Tripps Run are designated on sheets 1 through 8, inclusive.

    Tributary flood plain limits for Tripps Run are designated on sheets 9 through 14, inclusive.

    Main channel flood plain limits for Holmes Run are designated on sheets 27 through 44, inclusive.

    Tributary flood plain limits for Holmes Run are designated on sheets 44 through 46.

    (b)

    There is also hereby adopted the flood plains in Cameron Run and its principal tributaries, specifically delineated on sheets numbered CA1, CA2, CA3, CB1, CB2, CB3, CB4, CB5, CB6 (Revised), CB7 (Revised), CB8 (Revised), CC1, CC2, CC3 (Revised), CD1, CD2, CE1, CE2, and CE3.

    The maps include Pikes Branch, Holmes Run below Lake Barcroft, all of Cameron Run and the arm of the Potomac River estuary into which Cameron Run flows known as Hunting Creek, Back Lick Run, Turkeycock Run and Indian Run and were prepared by U. S. Geological Survey.

    The letters of transmittal, dated 22 March 1966 and 22 July 1966 from the Local Engineer-in-Charge of the U.S. Geological Survey include the reports of these studies and associated charts.

    The flood plain limits, designated 100-year frequency, shall apply to all of the Cameron Run Basin, shown on these maps.

    Tributary flood plain limits for Holmes Run are designated on sheets CA1, CA2, and CA3.

    Tributary flood plain limits for Back Lick Run are designated on sheets CB1, CB2, CB3, CB4, CB5, CB6 (Revised), CB7 (Revised) and CB8 (Revised).

    Tributary flood plain limits for Indian Run are designated on sheets CB6 (Revised), CC1, CC2 and CC3 (Revised).

    Tributary flood plain limits for Turkeycock Run are designated on sheets CB5, CC3 (Revised), CD1 and CD2.

    Tributary flood plain limits for Pikes Branch are designated on sheets CE1, CE2, and CE3.

    (c)

    There is also hereby adopted the flood plains in Pimmit Run and its principal tributary, specifically delineated on sheets numbered PA1, PA2, PA3, PA4, PA5, PA6, PA7, PA8, PA9, PA10, PA11, PA12, PA13, PB1, PB2 and PB3.

    The maps include Pimmit Run from the Arlington County line to Leesburg Pike and Little Pimmit Run from its confluence with Pimmit Run to the Arlington County line, and were prepared by U.S. Geological Survey.

    (d)

    There is also hereby adopted the flood plains in Dead Run, specifically delineated on sheets numbered DA1, DA2, DA3, DA4, DA5 and DA6.

    The maps include Dead Run from its mouth at the Potomac River to Old Dominion Drive, and were prepared by the U.S. Geological Survey.

    The letter of transmittal, dated 23 March 1967 from the Local Engineer-in-Charge of the U.S. Geological Survey includes a report of this study and associated charts.

    The flood plain limits, designated 100-year frequency, shall apply to all of the Pimmit Run Basin, shown on these maps.

    Main channel flood plain limits for Pimmit Run are designated on sheets PA1, PA2, PA3, PA4, PA5, PA6, PA7, PA8, PA9, PA10, PA11, PA12, PA13 and PB3.

    Tributary flood plain limits for Little Pimmit Run are designated on sheets PB1 and PB2.

    The letter of transmittal, dated 26 April 1968, from the Local Engineer-in-Charge of the U. S. Geological Survey, includes a report of this study and associated charts.

    The flood plain limits, designated 100-year frequency, shall apply to all of the Dead Run Basin, shown on these maps.

    (e)

    There is also hereby adopted the flood plains in Scott Run, specifically delineated on sheets numbered SA1, SA2, SA3, SA4, SA5, SA6, SA7, SA8 and SA9.

    The maps include Scott Run from its mouth at the Potomac River to a point one-half mile north of Chain Bridge Road, and were prepared by the U.S. Geological Survey.

    The letter of transmittal, dated 22 July 1968, from the Local Engineer-in-Charge of the U.S. Geological Survey, includes a report of this study and associated charts.

    The flood plain limits, designated 100-year frequency, shall apply to all of the Scott Run Basin, shown on these maps.

    (f)

    There is also hereby adopted the flood plains in the Difficult Run Basin, specifically delineated on sheets numbered in DiA1 to DiA27 inclusive; DiB1 and DiB2; DiC1, DiC2 and DiC3; DiD1 to DiD6 inclusive; DiE1 to DiE4 inclusive; DiF1, DiF2 and DiF3; DiG1 and DiG2; DiH1 to DiH5 inclusive; DiI1 to DiI12 inclusive except portions within the corporate boundaries of the Town of Vienna; DiJ1 and DiJ2; DiK1 to DiK8 inclusive; DiL1 to DiL6 inclusive; DiM1 to DiM4 inclusive; and DiN1 to DiN6 inclusive.

    The maps include Difficult Run from its mouth at the Potomac River to south of U. S. Route 50 and its principal tributaries consisting of Rocky Branch Tributary, Rocky Branch, Little Difficult Run, South Fork Snakeden Branch, The Glade, Piney Branch, Wolftrap Creek, Old Courthouse Spring Branch, Colvin Run, Piney Run, Captain Hickory Run and Rocky Run, as prepared by the U.S. Geological Survey.

    The letter of transmittal, dated March 2, 1970, from the Hydrologist-in-Charge of the U.S. Geological Survey, includes a report of this study and associated charts.

    The flood plains limits, designated 100-year frequency, shall apply to all of the Difficult Run Basin, shown on these maps.

    (g)

    There is also hereby adopted the flood plains in the Accotink Creek Basin, specifically delineated on sheets numbered AA2b and AA2c; AA2 to AA33 inclusive; AC1 and AC2; AD1, AD2 and AD3; AE1 and AE2; AF1 and AF2; AG1 to AG9 inclusive; and AH1 to AH7 inclusive.

    The maps include Accotink Creek from Telegraph Road to the City of Fairfax and its principal tributaries consisting of Bear Branch, Long Branch near Vienna, Crook Branch, Turkey Run, Long Branch near Annandale and Long Branch near Newington as prepared by the U.S. Geological Survey.

    The letter of transmittal, dated April 2, 1970, from the Hydrologist-in-Charge of the U.S. Geological Survey, includes a report of this study and associated charts.

    The flood plains limits, designated 100-year frequency, shall apply to all of the Accotink Creek Basin, shown on these maps.

    (h)

    There is also hereby adopted the flood plains in the Pohick Creek Basin, specifically delineated on sheets numbered PoA1 to PoA6 inclusive; PoB1 to PoB5 inclusive; PoC1 to PoC26 inclusive; PoD1 to PoD7 inclusive; and PoE1 to PoE21 inclusive.

    The maps include Pohick Creek from its mouth at Pohick Bay to the Southern Railroad and its principal tributaries consisting of Rabbit Branch, Sideburn Branch, Middle Run and South Run as prepared by the U.S. Geological Survey.

    The letter of transmittal, dated January 16, 1970, from the Hydrologist-in-Charge of the U. S. Geological Survey, includes a report of this study and associated charts.

    The flood plains limits, designated 100-year frequency, shall apply to all of the Pohick Creek Basin, shown on these maps.

    (i)

    There is also hereby adopted the flood plains in the Horsepen Creek Basin, specifically delineated on sheets numbered HA1 to HA6 inclusive; HB1; HC1 and HC2; and HD1, HD2 and HD3.

    The maps include Horsepen Creek from Route #28 Sully Road to West Ox Road and its principal tributaries consisting of Cedar Run, Frying Pan Branch and Merrybrook Run, as prepared by the U. S. Geological Survey.

    The letter of transmittal, dated November 16, 1971, from the Hydrologist-in-Charge of the U. S. Geological Survey, includes a report of this study and associated charts.

    The flood plain limits, designated 100-year frequency, shall apply to all of the Horsepen Creek Basin, shown on these maps.

    (j)

    There is also hereby adopted the flood plains in the Sugarland Run Basin, specifically delineated on sheets numbered SuA1 to SuA11 inclusive; SuB1 and SuB2; and SuC1.

    The maps include Sugarland Run from Route #7 Leesburg Pike to south of the Dulles Airport Access Road and its principal tributaries consisting of Folly Lick Run and Muddy Branch, as prepared by the U.S. Geological Survey.

    The letter of transmittal, dated November 16, 1972, from the Hydrologist-in-Charge of the U.S. Geological Survey, includes a report of this study and associated charts.

    The flood plains limits, designated 100-year frequency, shall apply to all of the Sugarland Run Basin, shown on these maps.

    (k)

    There is also hereby adopted the flood plains in the Occoquan Creek Basin, specifically delineated on sheets numbered OA3 to OA35 inclusive.

    The maps include Occoquan Creek from its mouth at Belmont Bay to its intersection with Bull Run at the Prince William-Fairfax County Line, as prepared by the U. S. Geological Survey.

    The letter of transmittal, dated November 16, 1971, from the Hydrologist-in-Charge of the U. S. Geological Survey, includes a report of this study and associated charts.

    The flood plains limits, designated 100-year frequency, shall apply to all of the Occoquan Creek Basin, shown on these maps.

    (l)

    There is also hereby adopted the flood plains in the Little Hunting Creek Basin, specifically delineated on sheets numbered 1 to 26 inclusive.

    The maps include Little Hunting Creek from its mouth at the Potomac River to south of U.S. Route 1 and its principal tributaries consisting of West Branch, Paul Spring Branch, Fort Hunt Road Tributary and Camden Street Tributary, as prepared by Massey Engineers.

    The flood plains limits, designated 100-year frequency, shall apply to all of the Little Hunting Creek Basin, shown on these maps.

    (m)

    There is also hereby adopted the flood plains in the Johnny Moore Creek Basins, specifically delineated on sheets numbered JA1 to JA6 inclusive.

    The maps include Johnny Moore Creek from its confluence with Bull Run to Old Clifton Road, as prepared by the U.S. Geological Survey.

    The letter of transmittal, dated July 10, 1972, from the Hydrologist-in-Charge of the U.S. Geological Survey, includes a report of this study and associated charts.

    The flood plains limits, designated 100-year frequency, shall apply to all of the Johnny Moore Creek Basin, shown on these maps.

    (n)

    There is also hereby adopted the flood plains in the Cub Run Basin, specifically delineated on sheets numbered CuA1 to CuA22 inclusive; CuB1; CuC1, CuC2 and CuC3; CuD1, CuD2 and CuD3; CuE1 to CuE10 inclusive; CuF1, CuG1 to CuG6 inclusive; CuH1 and CuH2; and CuI1 to CuI14 inclusive.

    The maps include Cub Run from its confluence with Bull Run to north of U.S. Route 50 and its principal tributaries consisting of Dead Run, Cain Branch, Schneider Branch, Flatlick Branch, Oxlick Branch, Elklick Branch, Roundlick Branch and Big Rocky Run, as prepared by the U.S. Geological Survey.

    The letter of transmittal, dated July 10, 1972, from the Hydrologist-in-Charge of the U.S. Geological Survey, includes a report of this study and associated charts.

    The flood plains limits, designated 100-year frequency, shall apply to all of the Cub Run Basin, shown on these maps.

    (o)

    There is also hereby adopted the flood plains in the Bull Run Basin, specifically delineated on sheets numbered BuA1 to Bu44 inclusive; BuB1, BuB2 and BuB3; and BuC1.

    The maps include Bull Run from its confluence with the Occoquan Creek to the Fairfax-Loudoun County Line and its principal tributaries of Tributary A and Tributary B, as prepared by the U.S. Geological Survey.

    The letter of transmittal, dated May 22, 1972, from the Hydrologist-in-Charge of the U.S. Geological Survey, includes a report of this study and associated charts.

    The flood plains limits, designated 100-year frequency, shall apply to all of the Bull Run Basin, shown on these maps.

    (p)

    There is also hereby adopted the flood plains in the Dogue Creek Basin, specifically delineated on sheets numbered 1 to 30 inclusive except sheets numbered 16 and 25 and the portions of sheets 4 and 5 showing floodplain area between Mount Vernon Memorial Highway (Route 235) and Jefferson Davis Highway (U.S. Route 1).

    The maps include Dogue Creek from Fort Belvoir Reservation, just south of Mount Vernon Road to Telegraph Road and its principal tributaries consisting of North Branch, South Branch and South Branch Tributary, as prepared by Massey Engineers.

    The flood plains limits, designated 100-year frequency, shall apply to all of the Dogue Creek Basin, shown on these maps.

    (q)

    There is also hereby adopted the flood plains in the Giles Run Basin specifically delineated on sheets numbered GA1 to GA12 inclusive.

    The maps include Giles Run from its confluence with Belmont Bay to northwest of Hooes Road, as prepared by U.S. Geological Survey.

    The letter of transmittal, dated February 9, 1973, from the Hydrologist-in-Charge of the U.S. Geological Survey, includes a report of this study and associated charts.

    The flood plains limits, designated 100-year frequency, shall apply to all of the Giles Run Basin, shown on these maps.

    (r)

    There is also hereby adopted the flood plains in the Little Rocky Run Basin specifically delineated on sheets numbered LA1 to LA9 inclusive.

    The maps include Little Rocky Run from its confluence with Bull Run to north of Lee Highway as prepared by the U.S. Geological Survey.

    The letter of transmittal, dated April 20, 1973, from the Hydrologist-in-Charge of the U.S. Geological Survey, includes a report of this study and associated charts.

    The flood plains limits, designated 100-year frequency, shall apply to all of the Little Rocky Run Basin, shown on these maps.

    (s)

    There is also hereby adopted the flood plains in the Elk Horn Run Basin specifically delineated on sheet numbered EHA1.

    The map includes Elk Horn Run from its confluence with Occoquan Creek to southwest of Ox Road as prepared by the U.S. Geological Survey.

    The letter of transmittal, dated April 20, 1973, from the Hydrologist-in-Charge of the U.S. Geological Survey, includes a report of this study and associated charts.

    The flood plains limits, designated 100-year frequency, shall apply to all of the Elk Horn Run Basin, shown on this map.

    (t)

    There is also hereby adopted the flood plains in the Wolf Run Basin specifically delineated on sheets numbered WA1 to WA7 inclusive.

    The maps include Wolf Run from its confluence with Occoquan Creek to north of Clifton Road as prepared by the U.S. Geological Survey.

    The letter of transmittal, dated April 20, 1973, from the Hydrologist-in-Charge of the U.S. Geological Survey, includes a report of this study and associated charts.

    The flood plains limits, designated 100-year frequency, shall apply to all of the Wolf Run Basin, shown on these maps.

    (u)

    There is also hereby adopted the flood plains in the Popes Head Creek Basin, specifically delineated on sheets numbered PHA1 to PHA14 inclusive; PHB1 to PHB5 inclusive; and PHC1 and PHC2.

    The maps include Popes Head Creek from its confluence with Bull Run to north of Braddock Road and its principal tributaries consisting of Piney Branch and Castle Creek as prepared by the U.S. Geological Survey.

    The letter of transmittal, dated September 12, 1973, from the Hydrologist-in-Charge of the U.S. Geological Survey, includes a report of this study and associated charts.

    The flood plains limits, designated 100-year frequency, shall apply to al of the Popes Head Creek Basin, shown on these maps.

    (v)

    There is also hereby adopted the flood plains in the Sandy Run Basin, specifically delineated on sheets numbered SaA1 to SaA9 inclusive.

    The maps include Sandy Run from its confluence with Occoquan Creek to north of Clifton Road as prepared by the U.S. Geological Survey.

    The letter of transmittal, dated September 12, 1973, from the Hydrologist-in-Charge of the U.S. Geological Survey, includes a report of this study and associated charts.

    The flood plains limits, designated 100-year frequency, shall apply to all of the Sandy Run Basin, shown on these maps. (1961 Code, § 1-8; 40-73-1; 4-74-1; 21-99-A; 7-04-A; 22-10-A; 33-17-A.)