Home > Archives > Additional Archives > John Helly   John Helly San Diego Supercomputer Center La Jolla, CA 92093 helly@sdsc.edu http://www.sdsc.edu/~hellyj   Abstract: Scalable Watershed Modeling of Surface Water Runoff The purpose of this work is to develop a preliminary model of an urban watershed and a general methodology for estimating and predicting stormwater runoff from the watersheds of San Diego County. The emphasis of this effort is directed toward the coastal waters with the intent of isolating the portions of the watershed contributing toxic materials to the runoff in support of TMDL-based (Total Maximum Daily Load) watershed management policies. In collaboration with the San Diego County Stormwater Management Department, we have selected Los Penasquitos Lagoon to conduct our pilot study and develop the data sources and methods to support modeling of other arbitrarily-located watersheds. A particular challenge in this work, and an aspect that makes it especially interesting to other parts of the world, is the general lack of information within San Diego County regarding surfacewater flow. To overcome this limitation we are developing methods to extract the basic structural watershed information from synoptic data sources provided by the United States Geological Survey. The same information is available for most of the contiguous United States and therefore our method is applicable to many other parts of the country.
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