Overly Drive Flood Mitigation Project Lee District

Project No. SD-000031-022

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

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

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

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

After Construction

Existing Water Ponding Area

New Overland Relief Channel

Post Construction: Newly Constructed Four Rock Steps and Imbricated Rock Wall

Imbricated Rock Wall

Rock Steps

Reinforced Bed Material

For additional Information, please call Irene Haske, Public Information Officer

703-324-5821, TTY 711 SWPDmail@fairfaxcounty.gov

www.fairfaxcounty.gov/dpwes