Overly Drive Flood Mitigation Project Lee District Project No. SD-000031-022

1. Overly Drive Flood Mitigation
Project
Lee District
Project No. SD-000031-022

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. 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. 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. Pre-existing Condition
Flooding during September 8, 2011 storm event

6. After Construction
Existing Water Ponding Area
New Overland Relief Channel

7. Post Construction: Newly Constructed Four Rock
Steps and Imbricated Rock Wall
Imbricated Rock Wall
Rock Steps
Reinforced Bed Material

8. For additional Information, please call
Irene Haske, Public Information Officer
703-324-5821, TTY 711
SWPDmail@fairfaxcounty.gov
www.fairfaxcounty.gov/dpwes