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Stormwater Runoff Characterized by GIS Determined Source Areas and Runoff Volumes
Authors:Yang Liu  Puripus Soonthornnonda  Jin Li  Erik R Christensen
Institution:(1) Department of Civil Engineering and Mechanics, University of Wisconsin-Milwaukee, Milwaukee, WI 53201, USA;(2) Present address: Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB, T6G 2W2, Canada;(3) Department of Civil Engineering, Faculty of Engineering, Srinakharinwirot University, Rangsit-Nakhon Nayok Rd., Klong 16 Ongkharak, Nakhon Nayok, 26120, Thailand
Abstract:Runoff coefficients are usually considered in isolation for each drainage area with resulting large uncertainties in the areas and coefficients. Accurate areas and coefficients are obtained here by optimizing runoff coefficients for characteristic Geographic Information Systems (GIS) subareas within each drainage area so that the resulting runoff coefficients of each drainage area are consistent with those obtained from runoff and rainfall volumes. Lack of fit can indicate that the ArcGIS information is inaccurate or more likely, that the drainage area needs adjustment. Results for 18 drainage areas in Milwaukee, WI for 2000–2004 indicate runoff coefficients ranging from 0.123 for a mostly residential area to 0.679 for a freeway-related land, with a standard error of 0.047. Optimized runoff coefficients are necessary input parameters for monitoring, and for the analysis and design of in situ stormwater unit operations and processes for the control of both urban runoff quantity and quality.
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