Local Stormwater Retrofit Case Studies. Westmoreland County Conservation District Updated 11/2011
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1 Local Stormwater Retrofit Case Studies Westmoreland County Conservation District Updated 11/2011 WCD 2010
2 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
3 Stormwater management should replicate the natural water cycle
4 Annual hydrologic cycle for undisturbed acreage Annual hydrologic cycle for undisturbed acreage in Westmoreland County WCD 2010
5 Annual hydrologic cycle for developed acreage Annual hydrologic cycle for developed acreage in Westmoreland County WCD 2010
6 SW PA Rainfall Almost 98% of our rain events each year are less than 1 inch WCD 2010
7 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
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9 Seton Hill Drive Lot 4,400 sf Porous Paving Earthwork Balance 1,500 sf Bio- Infiltration Underground Infiltration Chambers WCD 2010
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22 Moore Avenue Lot WCD 2010
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28 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
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32 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
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38 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
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51 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
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55 Mount Pleasant Borough parking lots generated stormwater which ran uncontrolled into the streets WCD 2010
56 5 rain garden locations were excavated at the low point in each parking bay WCD 2010
57 Each rain garden has an underdrain layer of a perforated pipe and clean stone wrapped in fabric WCD 2010
58 Each rain garden has a rain garden soil mix and an overflow riser connected to the underdrain WCD 2010
59 The rain gardens are landscaped with native plants, mulch and stone to slow and infiltrate runoff WCD 2010
60 Rain water rushes into the rain garden through curb cuts and onto rock energy dissipaters WCD 2010
61 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
62 The Borough of Vandergrift has wide sidewalks and many street trees, just not in this location WCD 2010
63 A green plan for managing urban stormwater runoff was designed to go under the wide sidewalks, and soaked up by trees WCD 2010
64 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
65 Silva Cells support pavements while protecting the soil within them from compaction for better water retention and tree health WCD 2010
66 Porous concrete was placed over the Silva Cells on a bed of crushed stone, leaving holes for planted trees WCD 2010
67 Porous concrete allows rainwater through to the tree root systems which have free-reign in the un-compacted soil
68 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
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73 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
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75 9,000 sf Green Roof 700 sf Bio- Infiltration 1,125 sf Minimize Compaction 600 sf Protected Trees WCD sf Wet Pond 0.48 ac Woodland Protected 5,400 sf Infiltration Paving
76 Pervious Paving WCD 2010
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94 Vegetated Retaining Slope WCD 2010
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100 Anchored Retaining Wall WCD 2010
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104 Forebay / Wet Pond WCD 2010
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110 Stormwater Management is your friend WCD 2010
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