This project will restore 4,300 feet of stream on Lake Werowance Inc. and privately owned properties. Goals are stabilized stream banks and bed, reduced sediment and nutrients, improved habitat, and enhanced water quality.

1. A Fairfax County, VA, publication
Department of Public Works and Environmental Services
Working for You!
October 2018
Piney Run Run at Lake Werowance
Stream Restoration Project

2. Stormwater Planning Division
Program Drivers
Project Goals
Environmental Benefits
Existing Conditions
Next steps
Contact information
2
Agenda

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Stormwater Program Drivers
• Municipal Separate Storm Sewer System Permit (MS-4)
• Chesapeake Bay Total Maximum Daily Loads (TMDL)
– Regulates amount of sediment, nitrogen and phosphorous Fairfax County
contributes to the Chesapeake Bay in stormwater runoff
• Other Local TMDLs
• Maintenance of Existing Facilities
• Dam Regulations
• Public Safety/Emergency Response
– Flooding
– Snow Removal

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Piney Run at Lake Werowance Stream Restoration
Project Limits

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Historic Imagery - 1937

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Historic Imagery - 1976

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Historic Imagery - 1990

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Historic Imagery - 2011

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Historic Imagery - 2012

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Imagery - 2017

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Project Goals
• Restore up to 4,300 feet of stream on Lake Werowance
Inc. and privately owned properties.
 Stabilize streambed and banks
Reduce sediment and nutrient inputs into stream
system
 Improve habitat
 Maintain close coordination with stakeholders
 Enhance water quality and biological diversity through
the enhancements of existing wetland features within
the former lakebed

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Existing
Conditions

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Existing Conditions – Start of Reach 1
October 7, 2016

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Existing Conditions – Reach 1
October 7, 2016

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Existing Conditions – Reach 1
October 7, 2016

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Existing Conditions – Reach 1
October 7, 2016

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Existing Conditions – Start of Reach 2
October 7, 2016

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Existing Conditions – Reach 2
October 7, 2016

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Existing Conditions – Reach 2
May 11, 2017

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Existing Conditions – Reach 2
June 8, 2016

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Existing Conditions – Reach 2
June 8, 2016

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Existing Conditions – Reach 2
June 8, 2016

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Existing Conditions – Start of Reach 3
June 8, 2016

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Existing Conditions
October 7, 2016

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Existing Conditions – Reach 3

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Existing Conditions – Reach 3

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Potential
Solutions -
Stantec

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Alternative 1

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Alternative 2

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Alternative 3

32. Existing reference condition on Reach 1 of Piney Run
• Bank Height Ratio (BHR) of 1.0 = Access to floodplain
• Stable riffle/pool sequences, with high quality aquatic and riparian habitat
• Mature mixed deciduous riparian buffer

33. C4 reference reach: Jefferies Branch (Loudoun County, Virginia)
• Geomorphologic ratios of this reference reach are part of the “blueprint” for
the proposed design of Piney Run

34. C4 urban reference reach: Neabsco Creek (Dale City, Virginia)
• Geomorphologic ratios of this urban reference reach are part of the
“blueprint” for the proposed design of Piney Run

35. C4 reference reach: Norton Prong (Spotsylvania County, Virginia)
• Geomorphologic ratios of this reference reach are part of the “blueprint” for
the proposed design of Piney Run

36. Project example: Goose Creek/Bolling Branch (Fauquier County, Virginia)
• Priority 1 restoration of Bolling Branch, two years after construction

37. Outer bend erosion – BEFORE restoration with bankfull bench and sod mats

38. Outer bend erosion – AFTER restoration with bankfull bench and sod mats

39. Outer bend erosion – AFTER restoration with wood toe

40. Proposed condition: conversion of old lake bed to interconnected stream and wetland system
• Construct meandering stable stream system that provides hydrology to complex wetland network
• Construct network of functional floodplain wetlands and open water features throughout old lake bed

41. Incised stream within floodplain meadow, BEFORE restoration
• Note stream erosion and incision which lowers the water table over time

42. Incised stream within floodplain meadow, AFTER restoration
• Note lifted stream and increased hydrology

43. Project example: Haines Branch stream and wetland restoration
• Note varying depths of wetland cells and open water features (photo taken prior to
planting)

44. Project example: Haines Branch stream and wetland restoration
• Note varying depths of wetland cells and open water features, all connected to a restored
meandering stream (photo taken prior to planting)

45. Project example: Sandy Bottom Wetland Mitigation site (Hampton, Virginia)
• Note the diversity of wetland vegetation based on hydrology

46. Project example: Goose Creek/Bolling Branch (Fauquier County, Virginia)
• Photograph taken May 2010, approximately one year after construction
• Note restored stream on right floodplain, with open water wetland cells in the old channel
location

47. Project example: Goose Creek/Bolling Branch (Fauquier County, Virginia)
• Photograph taken September 2013
• Note the maturation of black willows and herbaceous vegetation after around three years

48. Project example: Goose Creek/Bolling Branch (Fauquier County, Virginia)
• Photograph taken May 2010, approximately one year after construction
• Note restored stream and wetland cells on the left floodplain

49. Project example: Goose Creek/Bolling Branch (Fauquier County, Virginia)
• Photograph taken September 2013
• Note maturation of black willow and sycamore in floodplain

50. Project example: Goose Creek/Bolling Branch (Fauquier County, Virginia)
• Photograph taken May 2010, approximately one year after construction

51. Project example: Goose Creek/Bolling Branch (Fauquier County, Virginia)
• Photograph taken September 2013

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Construction
Examples

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Construction
Access road and tree
protection area
Stockpile area

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Construction
Track truck
Excavator

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Construction

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Before and After Examples
Before One year after construction.
Bridal Path

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Before and After Examples
Dead Run Segment 1
March 2016 September 2018

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Before and After Examples
Dead Run Segment 1
March 2016 July 2018

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Construction Access Alternatives
Access points off Manning Street and/or Windswept Drive would require
permissions from Lake Werowance Inc. and at least 1 adjacent property owner.

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Construction Access Alternatives
Access point from downstream limit of project at Manning street would require private
property permissions and construction of a safe ramp which would impact trees.

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Construction Access Alternatives
Potentially gentler slope, less tree impact by moving access point closer to bridge.
Conflict with utility pole may require a relocation.

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Construction Access Alternatives
This option is heavily wooded and would have a significant impact to large trees.

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Schedule
• Pre-design Meeting – October 17, 2018
• Concept design – December 2018
• Concept design review meeting (field meeting) – January 2019
• Easement acquisition – Land rights with property owners will need to be finalized
prior to moving forward with 65% design.
• 65% Design
• Final Design
• Construction

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Contact Information
Contact Information
Design
Joe Riley-Ryan – Project Manager
703-324-5613
Joseph.Riley-Ryan@fairfaxcounty.gov
Fairfax County Stormwater Planning Division
703-324-5500 TTY 711
12000 Government Center Parkway
Suite 449
Fairfax, Virginia 22035
www.fairfaxcounty.gov/publicworks/stormwater
To request this information in an alternate format call 703-324-5500, TTY 711