Rain Garden Design Contest 2013

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Rain Garden Design Contest 2013. March 11 th 27 th. 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 - PowerPoint PPT Presentation

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Rain Garden Design Contest 2013

Rain Garden Design Contest 2013March 11th 27th What is a Rain Garden?Water collects in rain gardens and is filtered through the plants and the soilReduces speed of water, lessening erosion damage that usually occurs from fast-moving runoffRemoves pollutants and excess nutrients from the waterRecharges groundwater with filtered waterReduces polluted runoff water that enters waterways

Why Do we need a rain garden?

NCSSM is located on the Ellerbe Creek Watershed, which eventually flows into the Falls Lake Watershed.Falls Lake Watershed provides drinking water for over half a million people in the Raleigh Wake County AreaHowever, since 2010, Falls Lake Watershed has failed to meet the most basic water classification determined by the Clean Water Actthat it be swimmable and fishable.

3Falls Lake Clean Water requirementEPA 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 Raleighs E.M. Johnson Treatment Plant will be needed . Other improvements may cost an additional $200 million.

http://www.newsobserver.com/2010/03/07/374497/falls-lake-cleanup-will-be-costly.html#storylink=cpy

4Our goalOur proposed rain garden will remove ~ 1 lb of nitrogen per year, ~0.1 lb of phosphorous per year, and ~ 60lb of suspended solids per yearEngage local community to construct neighborhood and backyard rain gardensAssist local homeowners with rain garden construction to expand the impact of the best management practice. Our Current Location

Fig. 2 Heavy runoff from parking lot during rain eventFig.1 Current site: Royall Parking LotMap of Water Flow

Photos of Water Flow

Photo of Water Flow

Photo of Water Flow

Impervious Area = 6390 square ftPervious Area = 1278 square ftTotal Drainage Area = 7668 square ft

Imperv. Percentage in Watershed(%) = 83Pervious Percentage in Watershed(%)=17

Rv (runoff coefficient) = 0.67V(runoff volume) = 42 cubic ft

Partial sun exposureAppropriate site; not wet/saturated 1.5 days after rainfall Soil Type: urban soil Rain Garden Size: 1024 square ft

Peak storm water runoffC (runoff coefficient) = 0.73I (peak storm water runoff) = 7.2 in/hrQ (peak flow) = 0.092 cubic ft/second

Site MeasurementsTimeline + SubmissionDeadline: March 27th, 2013 @ 9:00 AM

If you have any questions, please contact agc.ncssm@gmail.com