Harrisonburg Conservation Assistance Program

HCAP Practice

Cost Share Rate

Cost Share Cap

Impervious Surface Removal (ISR)

100%

$7,500

Removal of impenetrable materials such as asphalt, compacted gravel, concrete, brick, and stone, combined with permeable pavement or vegetation establishment, is intended to reduce stormwater runoff rate and volume, as well as associated pollutants transported from the site by stormwater runoff. This BMP is not intended for impervious surface removal associated with above ground structures.

Average cost per square feet: $2.93 – $7.86*

Turf Conversion-Trees (TT)

100%

$3,500

The conversion of managed turf grass areas or bare soils to areas planted in native woody species. Managed turf is defined as grassed soil that no longer functions in its natural hydrologic state due to disturbance, compaction, or excessive management.

Average cost per tree:  $100 - $200*

Turf Conversion-Meadow (TM)

100%

$3,500

The conversion of managed turf grass areas or bare soils to areas planted in native herbaceous and woody species. Managed turf is defined as grassed soil that no longer functions in its natural hydrologic state due to disturbance, compaction, or excessive management.

Average cost per square feet: $ 3.10 - 14.84*

Urban Bioretention (UB)

100%

$5,000

A shallow landscaped depression that temporarily ponds stormwater runoff 6 to 12 inches above a mulch layer that encourages the rainwater to infiltrate into the underlying native soil within 48 hours.  Should be designed to treat runoff from small areas, such as individual rooftops, driveways, and other on-lot features in single-family detached residential developments

Average cost per square feet: TBD

Dry Swales (DS)

100%

$10,000

Shallow channels with a series of check dams to provide temporary storage and to allow infiltration. These serve to prevent scour and erosion and provide water quality treatment while conveying stormwater.

Average Cost per linear feet: TBD

Wet Swales (WS)

100%

$10,000

Shallow channels with check dams that create permanent pools that intercept groundwater and provide enhanced pollutant removal within the conveyance. The saturated soil and wetland vegetation provide an ideal environment for gravitational settling, biological uptake, and microbial activity.  

Average cost per linear feet: TBD

Rainwater Harvesting (RH)

100%

$30,000

The collection and conveyance into an above- or below-ground storage tank where it can later be used or directed to on-site stormwater practice for disposal/infiltration.

Average cost per gallon: TBD

Bioretention (BR)

100%

$30,000

Bioretention: A shallow landscaped depression that temporarily ponds runoff 6 to 12 inches above the mulch layer and then filters through an engineered soil media prior to discharging to an underdrain or infiltrating into the underlying native soils. Bioretention practices typically treat parking lots, multiple lots, and/or commercial rooftops.

Average cost per square feet: $48.90 - $67.72*

Permeable Pavement (PP)

100%

$25,000

A permeable surface that allows stormwater runoff to filter through voids in the pavement surface into an underlying stone reservoir, where it is temporarily stored and/or infiltrated.  

Average cost per square feet: $23.02 - $30.03*

Green Roof (GR)

100%

$30,000

Green Roof: An alternative roof surface that typically consists of waterproofing and drainage materials and an engineered growth media that is designed to support plant growth. Vegetated roofs capture and temporarily store stormwater runoff in the growth media. A portion of the captured stormwater evaporates or is taken up by plants, which helps reduce runoff volumes, peak runoff rates, and pollutant loads on development sites. Roofs must be designed to support the additional weight of this practice.

Average cost per square feet: $ 29.12 - 35.17*

Proprietary Filtering Devices (FD)

100%

$40,000

Proprietary Filtering Device (Non-Residential Only): Proprietary or manufactured Filtering Devices are BMPs that have engineered pollutant removal mechanisms that function similarly to the non-proprietary filtering BMPs, such as a rain garden. Proprietary devices can provide extra flexibility in the placement of the BMP as some of the approved devices are more compact than the traditional bioretention or can even be installed underground.

Average cost per unit: TBD