Workshop Windy Run, Spout Run, Lubber Run and Doctors Branch - - PowerPoint PPT Presentation

Watershed Planning Workshop

Windy Run, Spout Run, Lubber Run and Doctor‟s Branch

January 13, 2011 Washington & Lee High School

Arlington‟s watersheds Chesapeake Bay watershed

Watershed Retrofit Assessment

• Initiated May 2008
• Contracted to Center for Watershed Protection
• For each watershed, result is an inventory of

potential stormwater retrofit projects.

• http://www.arlingtonva.us/departments/Environm

entalServices/cpe/page60407.aspx

• Component of Arlington‟s Stormwater Master

Plan Update

Stormwater Master Plan Update

• Stormwater Master Plan (1996) and Watershed

Management Plan (2001) will be updated and combined into a comprehensive Master Plan.

 Storm Sewer Capacity Analysis to study the

County's current storm sewer pipes.

 County-wide stream inventory to assess stream

conditions and prioritize stream restoration projects.

 Watershed retrofit plans to identify locations where

stormwater treatment facilities can be added to help slow down and filter stormwater runoff.

Stormwater Retrofits

A retrofit is a stormwater management facility designed to store, infiltrate, and/or filter stormwater runoff from a contributing drainage area for which a stormwater management facility currently does not exist.

Storm drain to local stream… To the Potomac River On to the Chesapeake Bay

Water in storm drains does not go to a treatment plant…

Sediment and Nutrients

Impervious surface Runoff speed and volume Water Quality Groundwater supply

Effect of Urbanization on Watersheds

Stream Corridor Restoration, FISRWG, 1998

Severe streambank erosion and habitat degradation

Effect of Urbanization on Watersheds

Why Stormwater Retrofits?

• County streams are impacted.
• Most development occurred before

regulations that protect water quality and streams were enacted.

• Stormwater retrofits provide our best
• pportunities to improve watershed

health, along with redevelopment and stream restoration.

Why Stormwater Retrofits?

Stormwater retrofits will help:

• Clean and filter pollutants from runoff
• Slow and temporarily store stormwater runoff
• Improve water quality in our local streams

Impervious cover in Arlington = 42%

Buildings 30.1% Sidewalks 8.4% Roads 33.8% Paved median 0.6% Parking lot 15.7% Handicap ramp 0.1% Driveway 7.4% Alley 0.2% Airport 3.8%

Impervious cover in Arlington County - 2007

Watershed Planning Status

• 209 projects identified
• 7 Green Streets projects in design
• 8.1 acres of impervious area to be treated
• Williamsburg Blvd median (Old Dominion to 35th St N)
• Williamsburg Blvd median (Harrison to Edison N)
• Kensington Blvd (at 33rd St N)
• 32nd St N (at Kensington Blvd)
• John Marshall Dr median
• Patrick Henry Dr (at 9th Rd N)
• 8th St S (at Monroe St S)

Limitations of Watershed Retrofits

• Time and funding limitations mean projects will

be implemented incrementally.

• On average, assessments indicate about 15%
• f impervious area can be retrofitted.
• Retrofits alone cannot solve current flooding,

infrastructure and stream erosion problems.

• County must and will fund and implement

infrastructure updates and stream restoration projects in addition to retrofits.

• Implementation on private property is essential

for significant change.

Homeowner retrofit examples Cistern Rain Garden

Homeowner retrofit examples Rain Barrel(s) Pervious Pavement

Green roofs

INSERT NAME OF PROGRAM

• Retrofit incentive program for homeowners
• Partnership with Arlingtonians for a Clean

Environment

• In pilot year, providing 40 matching grants
• f $500-$1000 to homeowners for

sustainable stormwater projects.

• Applications available this spring.
• INSERT WEB ADDRESS

% Impervious Surface

Windy Run, Spout Run, Lubber Run and Doctor‟s Branch

Windy Run Spout Run Lubber Run Doctor's Branch County- wide 35.7 47.7 46.2 42.7 40.7 42.1

2005 2007

% Impervious Cover

Land Use

Source: 2001 Watershed Management Plan

48% 9% 4% 4% 29% 6% Low Density Medium Density High Density Vacant Public Commercial 57% 6% 6% 4% 14% 13% 74% 1% 5% 3% 16% 1%

Arlington County Spout Run Windy Run

Impervious surfaces are both public and private. There is a shared responsibility for the problem and the solution!

Impervious Surface Types

0.1% 31% 9% 20% 30% 10%

Doctor's Branch

0.4% 34% 9% 13% 34% 10%

Lubber Run

Alley Buildings Driveway Parking Lots Roads Sidewalks

Questions??

• Contact info:

 Phone: (703) 228-3588  Email: cjolicoeur@arlingtonva.us  Web:

www.arlingtonva.us Residents Environment Watershed Management

http://www.co.arlington.va.us/departments/Environ mentalServices/epo/page74076.aspx