Autumnwood Park Pond Retrofit Project
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Autumnwood Park Pond Retrofit Project

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Autumnwood Park Pond Retrofit Project

Autumnwood Park Pond Retrofit Project

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Autumnwood Park Pond Retrofit Project Autumnwood Park Pond Retrofit Project Presentation Transcript

  • Autumnwood Park Pond Retrofit Project Hunter Mill District, Tax Map No. 25-1 Project No. SD-000031-129
  • Project Details Description: The purpose of this project is the retrofit of an existing Stormwater Management Facility, referred herein as Autumnwood Regional Pond 330DP. The pond is located at 11950 Walnut Branch Road in Reston, VA, along Walnut Branch Road just east of Fairfax County Parkway, just west of trails edge lane and south of Lake Newport Road. The primary goals of this project were to provide water quality and to increase the storage of the pond. Project Overview: • • Excavating and constructing one forebay, wetlands, seven cascade steps and three micro-pools. Installing seven 16” coir logs in the adjacent woodland space in order to prevent eroded sediment large debris from blocking flow exiting the facility. • Water quality benefits obtained are 7.7 lbs./year of phosphorus, 63.4 lbs./year of nitrogen, and 2,720 lbs./year of total suspended solids from the runoff leading to Sugarland Run. • The disturbed area was restored with riparian seed mixes and native trees. • DPWES Project Team: * Project Manager: Fred Wilkins * Survey Analyst: Gregory Harper * Construction Manager: Yousef Rayyan * Project Inspector: Keith Ferrell
  • Autumnwood Park Pond Retrofit Project Hunter Mill District, Tax Map No. 11-3 LIMITS OF DISTURBANCE PROJECT SITE NORTH An Existing Riser
  • PRE-EXISTING CONDITIONS WETLAND CELL AREA THE RISER STRUCTURE THE PRE-EXISTING POND BEGINS WITH A LARGE OPEN GRASS FIELD THAT GRADUALLY SLOPES TOWARD THE RISER STRUCTURE
  • CONSTRUCTED WETLAND CELL WITH FOREBAY CONSTRUCTED FOREBAY CONSTRUCTED WETLANDS PRE-EXISTING RISER THREE CONSTRUCTED MICRO-POOLS PRE-EXISTING 36” CPP PIPE PLACED REINFORCED BEDDING MATERIAL AT INFLOW LOCATION
  • PRE-EXISTING CONDITIONS MICROPOOL AREA LOGS AND OTHER LARGE DEBRIS FREQUENTLY CREATED BLOCKAGES AND PREVENTED FLOW FROM PRE-EXITING THE POND. HIGH AMOUNTS OF SEDIMENT OFTEN CLOGGED THE TRASH RACK CREATING DRAINAGE PROBLEMS.
  • PRE-EXISTING CONDITIONS MICROPOOL AREA DAM EMBANKMENT PRE-EXISTING RISER BMP ORIFICE ERODING CHANNEL
  • CONSTRUCTED MICROPOOL AREA THREE NEWLY CONSTRUCTED MICRO-POOLS FLOW FROM THE WETLAND CELL IS DIRECTED INTO MICRO-POOLS THROUGH A CASCADE PRE-EXISTING BMP ORIFACE PLACED REINFORCED BEDDING MATERIAL TO TREAT ERODED AREAS
  • For additional Information, please call Irene Haske, Public Information Officer 703-324-5821, TTY 711 SWPDmail@fairfaxcounty.gov www.fairfaxcounty.gov/dpwes