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Abstract
Stormwater Master Planning with GIS: A Case Study of the Blue River WatershedTrack: Water Distribution, Wastewater, and Stormwater
Author(s): Andrew Sauer, Patrick O'Neill
A storm water master plan study was completed for the Blue River Watershed in southeast Johnson County, Kansas. The study focused on developing a storm water management plan that addresses existing problems and provides guidance for future growth. Traditional U.S. Army Corps of Engineers Hydrologic Engineering Center (HEC) models were applied with spatial mapping techniques using HEC-GeoRAS with ArcInfo and ArcView. These techniques allowed for the efficient development of spatially referenced watershed models covering 80 square miles.
The GIS databases were efficiently used to develop input parameters for the HEC-1 and HEC-RAS models. ArcInfo coverages of land use, soil type, slope, elevation, and Manning n values were used to delineate 368 subareas and determine basin flow path, slope, and drainage area. Literature values were used in conjunction with GIS data to develop values for key subarea input parameters such as subarea curve number and time of concentration. Both lag time and curve number for each subarea were calculated with a customized spreadsheet that used spatial data exported from ArcInfo. HEC-GeoRAS in conjunction with ArcInfo was used to prepare a georeferenced-based HEC-RAS model with stream network, cross-section geometry, and reach lengths. HEC-GeoRAS was used to generate HEC-RAS input data and process HEC-RAS output water profiles into spatially accurate watershed floodplains. Floodplain polygons were then overlaid onto existing GIS coverages in ArcView to provide an effective planning and decision making tool. In addition, ArcView scripts were effectively used to display, query, and export survey and cross-section profile data for use in HEC-RAS.
Andrew Sauer
Camp Dresser & McKee, Inc.
9229 Ward Parkway
Suite 320
Kansas City, MO 64114
USA
Phone: 816-444-8270
Fax: 816-444-9234
E-mail: SauerAN@cdm.com