Urban Storm-Water Management Plan Utilizing Arc View and HEC-HMS College Station, Texas Kara Corcoran CVEN 689

History of GIS and Water Resources  Early development of spatial data suited for the water resources field.

 Most of the work has been focused on Natural Systems Hydrology.

Why Use GIS for Storm-Water Management?

 Long-term planning tool that can be easily updated as development occurs.

HEC-HMS Software    Hydrologic Modeling System Developed by the Army Corps of Engineers, Hydrologic Engineering Center Designed to simulate the precipitation runoff processes of dendritic watershed systems.

Data  City of College Station, Land Use Data  STATSGO Soil Data  USGS 30 Meter DEM  City of College Station, Creek Shape file

Procedure  Develop a SCS curve number based on the STATSGO soils data and the City of College Station Land Use Data.

 Delineate sub-watersheds located in the City of College Station. Using CRWR-PrePro.

 Use HEC-HMS to develop hydrologic model of the City of College Station.

Development of Curve Numbers  Project all datasets into uniform projection  State Plane 1983, Texas Central  Develop a Land Use Code according to City’s description of Land Use  Anderson Level II  Calculate Curve Number based on Land Use and Soil as done in CVEN 689 lab.

Soils and Land Use Data

Curve Number Grid

Sub-Watershed Delineation  Project 30 Meter DEM into State Plane Projection  Burn Streams Using Creek Shape file  Fill Sinks  Flow Direction Grid

Flow Direction Grid

Watershed Delineation  Create Flow Accumulation Grid  Create Stream Grid  Link Stream Segments  Determine Stream Outlets from Links  Delineate Watersheds

Outlet Grid

Watershed Grid

HEC-HMS Model  Vectorize Streams and Watersheds  Calculate Stream and Watershed Parameters using CRWR-PrePro

HEC-HMS Model  Isolate Streams and Watersheds common to College Station City Limits

HEC-HMS  Write a Basin File for HEC-HMS using CRWR-PrePro  Import Basin File into HEC-HMS

Progress  Create Precipitation Model  Create Control Specifications  Compare results with a HEC-HMS model of College Station without the use of GIS.

Questions