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. Early development of spatial data suited for the water resources field. Most of the work has been focused on Natural Systems Hydrology. 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. Long-term planning tool that can be easily updated as development occurs.

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

Data City of College Station, Land Use Data City of College Station, Land Use Data STATSGO Soil Data STATSGO Soil Data USGS 30 Meter DEM USGS 30 Meter DEM City of College Station, Creek Shape file 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. 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. 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. Use HEC-HMS to develop hydrologic model of the City of College Station.

Development of Curve Numbers Project all datasets into uniform projection Project all datasets into uniform projection State Plane 1983, Texas Central State Plane 1983, Texas Central Develop a Land Use Code according to City’s description of Land Use Develop a Land Use Code according to City’s description of Land Use Anderson Level II Anderson Level II Calculate Curve Number based on Land Use and Soil as done in CVEN 689 lab. 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 Project 30 Meter DEM into State Plane Projection Burn Streams Using Creek Shape file Burn Streams Using Creek Shape file Fill Sinks Fill Sinks Flow Direction Grid Flow Direction Grid

Flow Direction Grid

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

Outlet Grid

Watershed Grid

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

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

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

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

Questions