Turkey Run at Langley High School Stream Restoration Public Meeting

Middle Potomac Watershed Plan Implementation

Turkey Run at Langley High School

Stream Restoration Project

Public Meeting

September 16, 2014

Stormwater Planning Division

Department of Public Works and Environmental Services

Meeting Outline

• Fairfax County Stormwater Management

• Countywide Watershed Plan Implementation

• Project Introduction and Objectives

• Existing Conditions

• Proposed Improvements - Options

• Example Projects

• Questions?

Fairfax County Department of Public Works

and Environmental Services (DPWES)Department of Public Works and Environmental Services

Land Development

Services

CapitalFacilities

Solid Waste Stormwater

Stormwater Planning Division

Maintenance and Stormwater

Management Division

Wastewater

Stormwater Infrastructure

• Conveyance System

– 1,600 miles pipe and

paved channel

– 43,000 structures

– 6,800 outfalls

• Management Facilities

– 1,540 County Maintained

– 3,720 Privately Maintained

• State Regulated Dams

Service Drivers

In response to The Clean Water Act of 1972…

National Pollutant Discharge Elimination System (NPDES)

Virginia Stormwater Management Program (VSMP)

Regulations

Municipal Separate Storm Sewer Permit (MS4)

Total Maximum Daily Loads (TMDLs)

Chesapeake Bay

Local Streams

Countywide Watershed Planning

“Healthy Watersheds,

Healthy Communities”

• 30 Designated

Watersheds

• All 15 watershed plans

have been adopted by

Fairfax County

http://www.fairfaxcounty.gov/dpwes/watersheds/

Middle Potomac Watershed Plan

• Watershed

Characterization

– Water Quality Monitoring

– Land Use Change

– Pollutant Loading

• Structural Project

– 25 year plan

• Non-Structural Practices

– Policy and Regulations

http://www.fairfaxcounty.gov/dpwes/watersheds/

Turkey Run Watershed Plan

• Turkey Run has a drainage

area of 1.95 mi2

• Projects identified in the

watershed management plan

• Pond retrofits

• LID Stormwater Enhancements

• Stream Restoration

• Neighborhood Stormwater

Improvements

http://www.fairfaxcounty.gov/dpwes/stormwater

/projects/project_list.htm

Before

Wakefield Run Stream Restoration

After

Wakefield Run Stream Restoration

Before After

Rabbit Branch Stream Restoration

Before After

Turkey Run Stream

Restoration

Next Steps

• Conceptual Design

• Land Acquisition/Coordination

• Preliminary Design

• Public Meeting

• Final Design

• Project Construction

• Funding FY2016 or FY2017

• Community Coordination: Pardon our Dust

• Maintenance and Operation

Natural Channel Design

Background and Design Approach

Stream Design Approaches

Natural Channel Design

3 design approaches

1)Analog

2)Empirical

3)Analytical

Turkey Run at Langley High School

Stream Restoration

Concept Design

Examples

Looking upstream at boulder

rock toe and constructed

riffle

Looking upstream at boulder

rock toe – 2 and 3 courses

Modified Cross Vane

Modified Cross Vane

Cross Vane Cross Vane

Cross Vane

Step Pool

Infill mix comprised of

cobbles, gravels, sand, silt,

topsoil

Larger material, usually

cobble

Constructed Riffle

(aka Reinforced Streambed)

Riffle

Access

During

May 2010

Before

Feb. 2010

After

Sept. 2010

Ratna Pottumuthu, ratna.pottumuthu@fairfaxcounty.gov

Matt Meyers, Matthew.Meyers@fairfaxcounty.gov

Stormwater Planning Division

Department of Public Works and Environmental Services

Fairfax County12000 Government Center Parkway, Suite 449

Fairfax, Virginia 22035

www.fairfaxcounty.gov/dpwes/stormwater

Questions ?

• Contact Information

A Fairfax County Publication, April 2014

ADA Statement: To request this information in an alternate format call 703-324-5500, TTY 711