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Waller Creek Sub-basin

Waller Creek Sub-basin. HMS. Review. Original project idea scrapped Difficult to find adequate GIS data No measured flow data to validate model results Selected new study area. New Area. Area Characteristics. Located on UT campus at 24 th and San Jacinto

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Waller Creek Sub-basin

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  1. Waller Creek Sub-basin HMS

  2. Review • Original project idea scrapped • Difficult to find adequate GIS data • No measured flow data to validate model results • Selected new study area

  3. New Area

  4. Area Characteristics • Located on UT campus at 24th and San Jacinto • Dr. Barrett has a monitoring point at basin outlet • Very urban and hydrologically restricted

  5. Goals • Create terrain model in Arcview • Process terrain model with HEC-geoHMS • Create working hydrologic model in HEC-HMS • Calibrate model and evaluate results with measured rainfall and runoff data

  6. Data • TIN developed by Esteban Azagra • One-meter DEM (courtesy of Becky) • Vegetation • Vegetation Removed • Dr. Barrett’s rainfall and runoff data at outlet

  7. Interesting Questions • Which data source is best suited for this application? • How can we use HEC-geoHMS? • How can we create a hydrologic model of a restricted basin in a meaningful way? • How will this model interact with other models created in the area?

  8. Story Begins • It all started with Esteban Azagra’s TIN • Converted TIN to a grid • Projected grid from State Plane to UTM • Overlayed grid onto a DOQQ for position verification

  9. TIN GRID (DEM) Conversion

  10. Projected Grid • Arc-Info

  11. Projected Grid • Code

  12. Overlayed Grid onto DOQQ

  13. Story Progresses • Fun with HEC-geoHMS • Familiar with HEC-geoHMS • Processed terrain data • Analyzed final result

  14. Familiar with HEC-geoHMS

  15. Familiar with HEC-geoHMS

  16. Fill Sinks Flow Direction HEC-geoHMS In Action!

  17. Flow Accumulation Watershed Delineation HEC-geoHMS In Action!

  18. End Result: Streams! Cool, but bad! Why? Streams are not behaving No way to modify! HEC-geoHMS In Action!

  19. Uh – Oh! What now?

  20. Drew in sewer system Burned into grid Pre-Pro In Action!

  21. The Plot Thickens! • Becky provides one-meter DEM of study area (E00 Files) • E00 files no longer a mystery to me • Import 71 • Becky solves vegetation problems

  22. Vegetated Vegetation Removed Enter LIDAR!

  23. LIDAR Flow Direction TIN Flow Direction Processing Both Grids in Pre-pro

  24. TIN Product

  25. LIDAR Product

  26. Comparison of Watersheds

  27. Comparison of Streams

  28. TIN GIS Model TIN Schematic Creation of HMS Schematic

  29. LIDAR GIS Model LIDAR Schematic Creation of HMS Schematic

  30. The Winner Is: • LIDAR for HMS • Too cumbersome to do both (out of time) • LIDAR looks better • Checked soil types via SSURGO • Developed curve numbers • Input hydrologic attributes • Ran model

  31. Intro to HMS • 3 Parts

  32. Basin Model • Chose SCS for loss and transform methods • Chose no baseflow • Chose lag method for reach routing • Parameters by Hand (and Arcview)

  33. All for this? Soil type is Ur (urban) Either C or D Land use is urban Curve numbers are either 94 (C) or 95 (D) I went with 95 Getting Soiled With SSURGO

  34. Hydrologic Parameters • Sub-basin attributes • Notice SLOPES!! • Those darned buildings!!!

  35. Hydrologic Parameters By Hand (and Arcview) • Reach Attributes • Chose lag transform • Easy

  36. User Specified Hyetograph From 0:00 to 23:55 10/18/99 5 minute increments Meteorologic Model and Control Specifications

  37. After all of this hard work: I am ready to reap what I have sowed RESULTS!!!

  38. Comparison to measured data:

  39. But I’m off by a factor of 10 Units problem? Variability in rainfall? Another problem? ??? Looks good …

  40. Calibrate this model (determine problem) Try to use HEC-geoHMS in combination with Pre-pro (burn sewers, process with geoHMS) Figure out how to make Pre-pro transfer hydrologic attributes Study how this model fits into models already completed I Would Like To:

  41. Questions?

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