Flood Mitigation Project on Overly Drive

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Overly Drive Flood Mitigation Project

Lee District

Project No. SD-000031-022

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Flood Mitigation Project on Overly Drive

  1. 1. Overly Drive Flood Mitigation Project Lee District Project No. SD-000031-022
  2. 2. Project Details Description: The Overly Drive Flood Mitigation was substantially completed on 6/28/2013, on time and within the budget. An existing 54” RCP located south of the junction box gets inundated and overflows, flooding five (5) houses located on Overly Drive. This project provided an overland relief channel that conveys water to an existing modified junction box and a 6’x6’ box culvert that is located at the north of the site along the backyard of the houses on the west side of Overly Drive. Project Overview: • An overland relief channel was constructed using natural stream channel design techniques to bypass water from water ponding area to an outlet structure under I-495, without flooding the adjacent private properties. • The following channel natural features were constructed: Four (4) rock steps, one (1) imbricated rock wall, four (4) rock cross vanes, one (1) rock weir structure and reinforced bed material was placed in the bottom of the proposed channel. • Re-graded the area on both side of the channel to direct the flow toward the channel and away from the adjacent houses. • Completely restored the disturbed area with selective seed mix, planting the site with selected mix of trees is scheduled to be in the Fall, 2013 DPWES Project Team: • Project Manager: Ratna S Pottumuthu • Construction Manager: Mannan Qureshi • Project Inspectors: Paul Thaler • Land Acquisition Agent: Vicki Johnson • Survey Analyst: Gregory Harper
  3. 3. 54” RCP 6’ x 6’ Box Culvert Gunnell Pond Project Location Unnamed Tributary to Cameron Run OVERLY DRIVE FLOOD MITIGATION PROJECT Lee District - Tax Map No. 81-1
  4. 4. Gunnell Pond County: 54” RCP Inlet VDOT 6’ x 6’ Box Culvert Inlet County: Yard Inlet Current Overland Relief Flow Paths 5622 OVERLY DRIVE FLOOD MITIGATION PROJECT Pre-existing Conditions
  5. 5. Pre-existing Condition Flooding during September 8, 2011 storm event
  6. 6. After Construction Existing Water Ponding Area New Overland Relief Channel
  7. 7. Post Construction: Newly Constructed Four Rock Steps and Imbricated Rock Wall Imbricated Rock Wall Rock Steps Reinforced Bed Material
  8. 8. For additional Information, please call Irene Haske, Public Information Officer 703-324-5821, TTY 711 SWPDmail@fairfaxcounty.gov www.fairfaxcounty.gov/dpwes

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