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Published byLynne Perkins Modified over 9 years ago
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RAIN GARDEN DESIGN CONTEST 2013 MARCH 11 TH – 27 TH
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WHAT IS A RAIN GARDEN? Water collects in rain gardens and is filtered through the plants and the soil Reduces speed of water, lessening erosion damage that usually occurs from fast- moving runoff Removes pollutants and excess nutrients from the water Recharges groundwater with filtered water Reduces polluted runoff water that enters waterways
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WHY DO WE NEED A RAIN GARDEN?
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FALLS LAKE CLEAN WATER REQUIREMENT EPA requirements for the Falls Lake Watershed: 20% reduction in total nitrogen by 2016 If the lake quality fails to improve by 2016, a $115 million upgrade of Raleigh’s E.M. Johnson Treatment Plant will be needed. Other improvements may cost an additional $200 million.
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OUR GOAL Our proposed rain garden will remove ~ 1 lb of nitrogen per year, ~0.1 lb of phosphorous per year, and ~ 60lb of suspended solids per year Engage local community to construct neighborhood and backyard rain gardens Assist local homeowners with rain garden construction to expand the impact of the best management practice.
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OUR CURRENT LOCATION Fig. 2 Heavy runoff from parking lot during rain event Fig.1 Current site: Royall Parking Lot
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MAP OF WATER FLOW
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PHOTOS OF WATER FLOW
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PHOTO OF WATER FLOW
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Impervious Area = 6390 square ft Pervious Area = 1278 square ft Total Drainage Area = 7668 square ft Imperv. Percentage in Watershed(%) = 83 Pervious Percentage in Watershed(%)=17 Rv (runoff coefficient) = 0.67 V(runoff volume) = 42 cubic ft Partial sun exposure Appropriate site; not wet/saturated 1.5 days after rainfall Soil Type: urban soil Rain Garden Size: 1024 square ft Peak storm water runoff C (runoff coefficient) = 0.73 I (peak storm water runoff) = 7.2 in/hr Q (peak flow) = 0.092 cubic ft/second SITE MEASUREMENTS
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TIMELINE + SUBMISSION Deadline: March 27 th, 2013 @ 9:00 AM If you have any questions, please contact agc.ncssm@gmail.comagc.ncssm@gmail.com
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