title: Stormwater runoff characterized by GIS determined source areas and runoff volumes.
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.
authors.affiliation: Department of Civil Engineering and Mechanics, University of Wisconsin-Milwaukee, Milwaukee, WI 53201, USA. yang.liu@ualberta.ca
authors.forename: Yang
authors.initials: Y
authors.lastname: Liu
authors.forename: Puripus
authors.initials: P
authors.lastname: Soonthornnonda
authors.forename: Jin
authors.initials: J
authors.lastname: Li
authors.forename: Erik R
authors.initials: ER
authors.lastname: Christensen
mesh_terms: D004323:Drainage, Sanitary / Q000706:statistics & numerical data; D004784:Environmental Monitoring / Q000379:methods*; D040362:Geographic Information Systems; D011891:Rain; D014872:Water Movements; D014881:Water Supply / Q000032:analysis* / Q000706:statistics & numerical data; D014922:Wisconsin