2004 UC Proceedings Abstract
 Geospatial Calculation of SCS Runoff Curve Numbers Track: Water Resources Author(s): John Huddleston The calculation of runoff curve numbers (RCN) to estimate volumes of runoff after rainfall is now made possible with a web based geospatial interface. Using hydrography, hypsography, and USDA soils data stored in ArcSDE 8.3 using SQL Server, a user can digitize online and use a .NET program to create a weighted RCN. This complicated system based on C++ COM+, JSCRIPT, Visual Basic, C# Global Assembly Cache, and Java using Tomcat allows a user to calculate the RCN in minutes whereas it used to take months. Orthophoto Mosaics from a Terra Server guide the user and online contours allow for creating watershed boundaries. The composite RCN is based on the intersection of USDA soils SSURGOv2 and the user delineated fields within the watershed. John Huddleston USDA NRCS 2150A Centre Ave Fort Coillins , CO 80526 US Phone: 970-295-5485 Fax: 970-295-5544 E-mail: jhuddleston@itc.nrcs.usda.gov |
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