Local Stormwater Retrofit Case Studies Westmoreland County Conservation District Updated 11/2011 WCD 2010
Why we do Sustainable Stormwater Management Retrofits To reduce flooding events and combined sewer overflows by replicating the natural water cycle and protecting the environment WCD 2010
Stormwater management should replicate the natural water cycle
Annual hydrologic cycle for undisturbed acreage Annual hydrologic cycle for undisturbed acreage in Westmoreland County WCD 2010
Annual hydrologic cycle for developed acreage Annual hydrologic cycle for developed acreage in Westmoreland County WCD 2010
SW PA Rainfall Almost 98% of our rain events each year are less than 1 inch WCD 2010
Greensburg Parking Lots small parking lot retrofit on two sites Objectives Alleviate runoff to combined sewer system Promote infiltration Encourage native plant use Treatments Bio-infiltration swales Porous paving Underground infiltration device WCD 2010
Seton Hill Drive Lot 4,400 sf Porous Paving Earthwork Balance 1,500 sf Bio- Infiltration Underground Infiltration Chambers WCD 2010
Moore Avenue Lot WCD 2010
Valley High School Objectives Alleviate runoff Promote infiltration Reduce urban heat island effect Aesthetic Treatments Porous paving system with concrete lattice blocks over gravel bed WCD 2010
Powdermill Nature Reserve / Phipps Conservatory Objectives Alleviate runoff Promote infiltration Reduce urban heat island effect Aesthetic Treatments Stabilized grass paving in plastic units WCD 2010
Scottdale Library Plaza small retrofit / landscape-hardscape Objectives Alleviate runoff to combined sewer system Promote infiltration Encourage native plant use Treatments Bio-infiltration garden Porous paving Raised planter WCD 2010
Mount Pleasant Parking Lot Rain Gardens stormwater retrofit Mount Pleasant PA Spring 2010 Westmoreland Conservation District Mount Pleasant Borough Mount Pleasant Parking Authority PA Department of Environmental Protection WCD 2010
Mount Pleasant Borough parking lots generated stormwater which ran uncontrolled into the streets WCD 2010
5 rain garden locations were excavated at the low point in each parking bay WCD 2010
Each rain garden has an underdrain layer of a perforated pipe and clean stone wrapped in fabric WCD 2010
Each rain garden has a rain garden soil mix and an overflow riser connected to the underdrain WCD 2010
The rain gardens are landscaped with native plants, mulch and stone to slow and infiltrate runoff WCD 2010
Rain water rushes into the rain garden through curb cuts and onto rock energy dissipaters WCD 2010
Columbia Avenue Tree Planting using Silva Cells Vandergrift PA Spring 2010 Westmoreland Conservation District Vandergrift Borough Vandergrift Improvement Program PA Department of Environmental Protection WCD 2010
The Borough of Vandergrift has wide sidewalks and many street trees, just not in this location WCD 2010
A green plan for managing urban stormwater runoff was designed to go under the wide sidewalks, and soaked up by trees WCD 2010
A Silva Cell soil containment system is set in a trench beneath the sidewalk and filled with a loose soil mix for stormwater retention WCD 2010
Silva Cells support pavements while protecting the soil within them from compaction for better water retention and tree health WCD 2010
Porous concrete was placed over the Silva Cells on a bed of crushed stone, leaving holes for planted trees WCD 2010
Porous concrete allows rainwater through to the tree root systems which have free-reign in the un-compacted soil
Scottdale Parking Lot stormwater islands Scottdale PA Summer 2011 Westmoreland Conservation District Southwest Regional Tax Bureau Jacobs Creek Watershed Association Scottdale Borough PA Department of Environmental Protection WCD 2010
GreenForge little retrofit, individual roof top, landscape/hardscape Objectives Alleviate runoff to Nature Park Promote infiltration Encourage native plant use Treatments Bio-infiltration swale Porous paving Green Roof WCD 2010
9,000 sf Green Roof 700 sf Bio- Infiltration 1,125 sf Minimize Compaction 600 sf Protected Trees WCD 2010 150 sf Wet Pond 0.48 ac Woodland Protected 5,400 sf Infiltration Paving
Pervious Paving WCD 2010
Bio-Infiltration Swale WCD 2010
Vegetated Retaining Slope WCD 2010
Anchored Retaining Wall WCD 2010
Forebay / Wet Pond WCD 2010
Green Roof WCD 2010
Stormwater Management is your friend WCD 2010