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

2. 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.

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

4. 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

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

6. CATALOGING UNIT 1,012,07 sq mi, 919.7 River Miles

7. 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
deg W Longitude

8. NHD DATA
Can be downloaded from the USGS National Hydrography Dataset Website
REACH NETWORK

9. USGS FLOW GAGING STATIONS
USGS Web Site
Only 2 Stations in HUC

10. STATION
Contributing Area is very small

11. STATION

12. BIG Thunder Storm???

13. 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

14. 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

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

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

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

18. EDITING THE STREAM NETWORK

19. MERGING THE DEMS

20. CLIPPING THE DEM TO THE POLYGON

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

22. CRWR-PREPRO Developed at CRWR by Dr. Maidment’s GIS research group
An ArcView preprocessor, currently only for HEC-HMS
prepro03a.apr

23. CRWR-PREPRO

24. 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)

25. COMPUTING THE FLOW DIRECTION GRID

26. 8-DIRECTION POUR-POINT MODEL32
128 64 16 1 8 4 2

27. COMPUTING THE FLOW ACCUMULATION GRID

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

29. 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

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

31. DELINEATING WATERSHEDS

32. VECTORIZING STREAMS AND WATERSHEDS

33. 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

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

35. 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
GIS-Based System of Hydrologic and Hydraulic Applications for Highway Engineering by Dr. Olivera and Dr. Maidment.