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Ephemeral Stormwater Outfall Restoration Park Drive RSC Fort Dupont Park (National Park Service), SE Washington DC Dcwater

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Ephemeral Stormwater Outfall Restoration Park Drive RSC Fort Dupont Park (National Park Service), SE Washington DC Dcwater Ephemeral Stormwater Outfall Restoration Park Drive RSC Fort Dupont Park (National Park Service), SE Washington DC DCWater Project Goals: • Provide stable conveyance ofofof 100100100- 100 ---yearyear storm event through thethethe design ofofof boulder cascades andandand cobble riffles, thus minimizing sediment loading tototo receiving stream channel, • Minimize impacts tototo well vegetated, steep slopes past thethethe gully’s toptoptop ofofof bank • Maximize nutrient uptake andandand improve water quality tototo thethethe unnamed tributary ofofof thethethe Anacostia River bybyby promoting infiltration, detention, andandand seepage through thethethe sand/mulch fill,fill,fill, which increases denitrification andandand sediment filtering, • Dissipate energy atatat thethethe existing outfall discharge point through thethethe design ofofof aaa series ofofof dissipation poolspools. ... Additional Project Benefits: • Enhance thethethe ecological functions ofofof thethethe sitesitesite through thethethe recharging ofofof groundwater andandand creation ofofof riffle/pools complexes, • Attenuate stormwater peak discharges tototo thethethe downstream, unnamed tributary ofofof thethethe Anacostia River through thethethe conversion ofofof surface flow tototo subsubsub- sub ---surfacesurface flow, • Preserve valuable over story trees bybyby minimizing construction impacts tototo thethethe adjacent woodlands, • Install aaa viable demonstration project tototo showcase costcost- ---effectiveeffective andandand ecologically appropriate restoration techniquestechniques. ... Ephemeral Stormwater Outfall Restoration Park Drive RSC Fort Dupont Park (National Park Service), SE Washington DC DCWater Anacostia Valley Area of the Western Shore Uplands Region of the Coastal Plain Province Constructed Summer 2014 Drainage Area = 7 acres Impervious Area = 1 acre 100 yryryrQ = ~35 cfscfscfs Restoration Length = 200’ Bank Height = +15’ Slope = 20% Design/Build Cost = $300,000 Drainage Area PrePrePre-Pre ---RestorationRestoration Condition PrePrePre --- Restoration Condition LOD = TOP OF BANK PrePrePre-Pre ---RestorationRestoration Condition Park Drive RSC instead of Extending Storm Riffles Drain Pipe Cascades Park Drive RSC Construction Heavy Rain During Construction Park Drive RSC Sand/Mulch Seam doubled as haul road Park Drive RSC Series of Cascades Park Drive RSC TieTieTie-Tie ---OutOut Riffles Park Drive RSC Boulder Headwall.
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