State Water Resources Research Institute Program

Project Id: 2010AL89B
Title: Experimental Investigation of Runoff Mitigation from Vegetated Roofs
Project Type: Research
Start Date: 3/01/2010
End Date: 2/28/2011
Congressional District: Seventh
Focus Categories: Surface Water, Water Quantity, Hydrology
Keywords: Urban Hydrology, Urban Drainage, Runoff, Rainfall-Runoff Process, Rainfall-Runoff Models, Hydraulics, Watershed Management
Principal Investigators: Kirby, Jason T.; Peters, Robert W.
Federal Funds: $ 25,000
Non-Federal Matching Funds: $ 50,828
Abstract: Recommendations for green roofs as stormwater mitigants will vary depending on whether the stormwater is captured directly on the green roof surface during a transient rain event, or whether stormwater is both captured directly and excess stormwater stored for subsequent irrigation.

Although research has been conducted on the viability and performance of vegetative roofs, the results obtained in those studies are directly transferable to the different climatic conditions of the southeastern United states. In the Southeast, rainfall amounts are gererally higher, low temperatures and snow occur infrequently, and higher average temperatures will be recorded. Therefore, research is needed to determine the effectiveness of green roofs for stormwater mitigation and develop optimal soil matrices incorporated with recycled construction materials for use in the Southeast. Very few studies have been aimed at the varying reduction of stormwater based on plant selection, and particularly in optimizing a green roof based on plant selection. We seek to develop the fundamental basis and practical application for developing green roof technology in the southeastern United States. We will identify and determine plant species and soil matrices that are optimal for developing sustainable vegetative roof systems for the southeastern United States. It is the objective of this research to quantify the stormwater reduction potential of vegetated roofs in the southeastern United States.

Progress/Completion Report, 2010, PDF

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