Broyhill McLean Estates BMP Neighborhood Improvement Project

A Fairfax County, VA, publication

Department of Public Works and Environmental ServicesWorking for You!

Broyhill McLean Estates BMP Neighborhood

Improvement Project

Public Meeting

McLean Community Center

May 29,2013

Broyhill McLean Estates BMP Neighborhood Improvement Project

Stormwater Planning Division

Meeting Outline

• Fairfax County Stormwater Management– Service Drivers

– Environmental Services

• Countywide Watershed Planning

• Project Objectives

• Existing Conditions

• Proposed Improvements – Options

• Example Projects

• Questions

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Broyhill McLean Estates BMP Neighborhood Improvement Project

Stormwater Planning Division

Division Organization

Fairfax County Department of Public Works and Environmental Services

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DPWES

Land Development

Services

CapitalFacilities

Solid Waste Stormwater Wastewater

Broyhill McLean Estates BMP Neighborhood Improvement Project

Stormwater Planning Division

Division Organization

• Fairfax County Stormwater Management

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STORMWATERMANAGEMENT

Stormwater Planning Division

Watershed Planning

and Assessment

Branch

Watershed Projects

Evaluation Branch

Watershed Projects

Implementation Branch

(North and South)

Maintenance and

StormwaterManagement

Division

Field Operations

Branch

InfrastructureBranch

Stormwater Management

Branch

Broyhill McLean Estates BMP Neighborhood Improvement Project

Stormwater Planning Division

Service Drivers

In Response to The Clean Water Act of 1972…

• National Pollutant Discharge Elimination System (NPDES)

• Municipal Separate Storm Sewer Permit (MS4)

• Total Maximum Daily Loads (TMDLs)

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Broyhill McLean Estates BMP Neighborhood Improvement Project

Stormwater Planning Division

Environmental Services

Preservation & Restoration of Our Natural Water Resources

Maintaining and Improving Stormwater Infrastructure

• Detention Basin Retrofits

• Outfall Restorations

• Stream and Stream Corridor Restoration

• Implementation of New Best Management Practices (BMPs) for water quality improvement

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Broyhill McLean Estates BMP Neighborhood Improvement Project

Stormwater Planning Division

Countywide Watershed Planning

Healthy Watersheds, Healthy Communities

• 30 Designated Watersheds

• All 15 Watershed Plans have been adopted by Fairfax County

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Broyhill McLean Estates BMP Neighborhood Improvement Project

Stormwater Planning Division

County Wide Watershed Planning

Dead Run Watershed Management Plan

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• Dead Run has a drainage area just over 3 mi2

• 24 priority projects identified in the watershed management plan

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

Broyhill McLean Estates BMP Neighborhood Improvement Project

Stormwater Planning Division

Project Objectives

Overall goal is to reduce stormwater runoff and related improvements discharging into Dead Run

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• Slowdown and infiltrate runoff.

• Enhance biological functions to filter and treat water.

• Improve aesthetics by integrating design into community landscape.

Broyhill McLean Estates BMP Neighborhood Improvement Project

Stormwater Planning Division

Current Project Status

• Survey has been completed by Fairfax County Survey

• Utility location has been completed

• Jurisdictional determination of waters of the U.S. and wetlands have been completed

• Geotechnical evaluation of the project area has been completed

• Fairfax County Urban Forestry has evaluated the condition of trees and shrubs located within the project area

• Concept plans have been developed by Williamsburg Environmental Group (WEG)

• Community has been notified by direct mail and email to property owners and Citizens Associations

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Broyhill McLean Estates BMP Neighborhood Improvement Project

Stormwater Planning Division

Project Overview

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Broyhill McLean Estates BMP Neighborhood Improvement Project

Stormwater Planning Division

Existing Conditions

• Unimproved swale provides drainage for approximately 21 acres of uncontrolled runoff

• Right of way has poor infiltration resulting in standing water in swale

• Approximately 35 trees and shrubs are located in the right of way

• Multiple utilities, both buried and aerial, cross the right of way

• History of maintenance issues identified by the community

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Broyhill McLean Estates BMP Neighborhood Improvement Project

Stormwater Planning Division

Existing Conditions Map

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Stormwater Planning Division

Broyhill McLean Estates BMP Neighborhood Improvement Project

Project Concepts – Option 1

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Stormwater Planning Division

Broyhill McLean Estates BMP Neighborhood Improvement Project

Project Concepts – Option 1 Benefits Summary

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Stormwater Planning Division

Broyhill McLean Estates BMP Neighborhood Improvement Project

Project Concepts – Option 2

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Stormwater Planning Division

Broyhill McLean Estates BMP Neighborhood Improvement Project

Project Concepts – Option 2 Benefits Summary

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Stormwater Planning Division

Broyhill McLean Estates BMP Neighborhood Improvement Project

Project Concepts – Option 3

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Stormwater Planning Division

Broyhill McLean Estates BMP Neighborhood Improvement Project

Project Concepts – Option 3 Benefits Summary

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Stormwater Planning Division

Broyhill McLean Estates BMP Neighborhood Improvement Project

Construction Details

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Broyhill McLean Estates BMP Neighborhood Improvement Project

Stormwater Planning Division

Example Projects – Infiltration Swale

Cub Run Rec Center 4630 Stonecroft Boulevard, Chantilly, Virginia

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Before After

Area Treated(acres)

Phosphorous Removal(lbs/yr)

Nitrogen Removal(lbs/yr)

Sediment Removal(tons/yr)

1.17 1.6 15 0.3

Broyhill McLean Estates BMP Neighborhood Improvement Project

Stormwater Planning Division

Example Projects – Stream Restoration

McLean Central Park 1468 Dolley Madison Boulevard, McLean, VA

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Before After

Drainage Area(acres)

Phosphorous Removal(lbs/yr)

Nitrogen Removal(lbs/yr)

Sediment Removal(tons/yr)

415 15 283 3

Stormwater Planning Division

Broyhill McLean Estates BMP Neighborhood Improvement Project

Project Examples

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Stone Weir Cascade Wooded Glen

Stormwater Planning Division

Broyhill McLean Estates BMP Neighborhood Improvement Project

Project Examples

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Wildflower Meadow Wildflower Meadow at Great Falls Library

Broyhill McLean Estates BMP Neighborhood Improvement Project

Stormwater Planning Division

Next Steps

• Finalize Design

• Notice to Proceed

• Project Construction

• Landscaping and Planting

• Annual Maintenance

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Additional Information

For additional information, please contact

www.fairfaxcounty.gov/dpwes

Broyhill McLean Estates BMP Neighborhood Improvement Project

Stormwater Planning Division 26

John Palmer

703-324-5647

[email protected]