Development of a Hydrologic Model for the Wichita Falls District Tanya Hoogerwerf

OBJECTIVE Develop a Hydrologic Model for a TxDOT Highway Drainage Structure (Initial Objective) Develop a Hydrologic Model for a Given Area in the Wichita Falls District (Current Objective) This is used to determine the design discharge for highway structures such as bridges, highway culverts, storm drains and water quality and quantity control structures.

WICHITA FALLS TxDOT district formed by nine counties: Archer, Baylor, Clay, Cooke, Montague, Throckmorton, Wichita, Willbarger and Young

Watershed Delineation using ArcView, Spatial Analyst and CRWR-PrePro PROCEDURE Obtaining and Preparing Data for Analysis using ArcView, Spatial Analyst and CRWR-Raster Watershed Delineation using ArcView, Spatial Analyst and CRWR-PrePro Preparing a Basin Model for use in the Hydrologic Modeling System (HEC-HMS) Calibrating the Hydrologic Model

OBTAINING THE NECESSARY DATA Cataloging Unit Digital Elevation Models NHD Data USGS Flow Gauging Locations and Data

CATALOGING UNIT 1,012,07 sq mi, 919.7 River Miles www.epa.gov/surf2/hucs/

DIGITAL ELEVATION MODEL CRWR Database, but can also be downloaded from the USGS NED website Three 1o x 1o seamless version, made up of 30m x 30m cells 33-35 deg N Latitude 98-100 deg W Longitude

NHD DATA Can be downloaded from the USGS National Hydrography Dataset Website http://nhd.usgs.gov REACH NETWORK

USGS FLOW GAGING STATIONS USGS Web Site www.usgs.gov Only 2 Stations in HUC 11130206

STATION 07312130 Contributing Area is very small

STATION 07312500

BIG Thunder Storm???

CREATING A POINT COVERAGE OF FLOW GAGING STATIONS Data from 1/1/97 to 1/1/98 Defined a table containing ID and lat/long data Loaded defgages.ave as provided by GIS homework

DATA PREPARATION Project all data into TSMS Albers Buffer the Cataloging Unit Extend and Edit the route.rch Merge the DEMs Clip DEM to buffered cataloging unit

PROJECTION PARAMETERS Texas Standard Mapping System True earth area preserved in map projections

BUFFERING THE CATALOGING UNIT This can be accomplished using the Theme/Create Buffers Command

EXTENDING THE REACH This can be done with the ArcView editing command…

EDITING THE STREAM NETWORK

MERGING THE DEMS

CLIPPING THE DEM TO THE POLYGON

WATERSHED DELINEATION CRWR-PrePro along with ArcView and Spatial Analyst can process a DEM and delineate its streams and networks

CRWR-PREPRO Developed at CRWR by Dr. Maidment’s GIS research group An ArcView preprocessor, currently only for HEC-HMS http://www.ce.utexas.edu/prof/olivera/prepro/prepro.htm prepro03a.apr

CRWR-PREPRO

BURNING IN THE STREAMS AND FILLING THE SINKS To correct for aberrations in the DEM, only tiny sinks are filled (ELEVATION RISE OF 1000 M)

COMPUTING THE FLOW DIRECTION GRID

8-DIRECTION POUR-POINT MODEL 32 128 64 16 1 8 4 2

COMPUTING THE FLOW ACCUMULATION GRID

DEFINING A THRESHOLD (Segments may also be added using the Add Streams function) 10,000! 5,000! 1,000! Define minimum stream drainage area

STREAM LINKS AND LINK OUTLETS This gives each link its own ID Outlets are the most downstream cells of the reach segments For all cells whose flow acc is greater than the threshold. 1 link per outlet

ADDING FLOW GAGE POINT COVERAGE Manually define the outlets with the O tool

DELINEATING WATERSHEDS

VECTORIZING STREAMS AND WATERSHEDS

Calibrating the Hydrologic Model TWO STEPS TO FINISH UP.... Preparing a Basin Model for use in the Hydrologic Modeling System (HEC-HMS) Calibrating the Hydrologic Model …..I have had a few minor problems….. Hydrologic Modeling System Hydrologic Engineering Center

CRWR 2nd Year Students David Anderson Dr.Olivera SPECIAL THANKS CRWR 2nd Year Students David Anderson Dr.Olivera

REFERENCES Delineating the Watershed and Stream Network of the Guadalupe Basin by David Maidment. Developed for the CE394-K3 GIS in Water Resources class at the University of Texas. Fall 1998. Developing a Hydrologic Model of the Guadalupe Basin by Francisco Olivera and David Maidment. Developed for the CE394-K3 GIS in Water Resources http://www.crwr.utexas.edu/gis/gishyd98/class/trmproj/ahrens/prepro.htm GIS-Based System of Hydrologic and Hydraulic Applications for Highway Engineering by Dr. Olivera and Dr. Maidment.