1 / 24

Ponds and Dams in the Pedernales River Basin

Ponds and Dams in the Pedernales River Basin. John Middleton CE 394K.2 May 2005. Project Goal. Develop a simple water balance model to predict water levels in various storage structures. Simple to use Data readily available Works Challenges How to calibrate. Motivation.

kennan-fowler
Télécharger la présentation

Ponds and Dams in the Pedernales River Basin

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Ponds and Damsin thePedernales River Basin John Middleton CE 394K.2 May 2005

  2. Project Goal Develop a simple water balance model to predict water levels in various storage structures. • Simple to use • Data readily available • Works Challenges • How to calibrate

  3. Motivation • Ponds and dams on family property • Roy Bedichek’s idea of “little waters” as habitats

  4. Analyze a progression of storage systems Cistern Tank Dam on intermittent creek Dam on river Approach

  5. Pedernales Watershed You Are Here Pedernales River Basin: 1294 mi²

  6. Upper Fall Creek

  7. Tools ArcGIS Watershed areas Landcover estimates Mathcad Infiltration model Excel Water balance calculations Data Precipitation NCDC, TWDB Evaporation TWDB Wells TWDB Flow USGS Miscellaneous – LCRA pubs, textbooks, Dad Tools and Data

  8. Plan A • Develop a monthly water balance in Excel • Infiltration – Mathcad Green-Ampt 2-layer model • Runoff estimates using SCS curve • Estimate demand based on published livestock consumption numbers • Assume storage volumes have uniform depth and vertical sides

  9. Cistern P - E - D Earthen Tank P - E - I - D + R Dam on Creek P - E - I - D + R + B P = Precipitation E = Evaporation D = Demand I = Infiltration R = Runoff B = Base Flow In Water Balance

  10. Plan B • Use daily rain data 1st Approach used mean monthly data • Problems with SCS model – single rain value not representative of the rain distribution

  11. Tank Catchment • Drainage: 235 acres • Tank depth: 8ft • Tank area: 1000 ft2

  12. Google Maps is Cool

  13. Spreadsheet Model

  14. Cistern/Tank Model Drainage: 235 acres Depth: 8ft Area: 1000 ft2 Start Depth: 8ft

  15. Cistern/Tank Model Drainage: 235 acres Depth: 8ft Area: 1000 ft2 Start Depth: 0ft

  16. Cistern/Tank Model Drainage: 235 acres Depth: 8ft Area: 1000 ft2 Start Depth: 0ft

  17. Upper Fall Creek Dam Catchment • Drainage: 3852 acres • Depth: 6ft • Tank area: 23,774 ft2

  18. Dam Model Drainage: 3582 acres Depth: 6ft Area: 23,774 ft2 Start Depth: 6ft

  19. Conclusions • Cistern/Tank model appears reasonable • Dam model • Difficult to calibrate • Creek baseflow not known • Runoff/infiltration model may be overly simplistic • Excel is good, but I’m tired of it

  20. Model Improvements • Infiltration model – convert to VB routine • SCS method needs daily data • Spring flow estimates • Shape of storage structure • NARR for evaporation • Doppler for rainfall • Improved runoff method

  21. Questions?

  22. Pedernales Basin

  23. Cistern/Tank Model Drainage: 235 acres Depth: 8ft Area: 1000 ft2 Start Depth: 0ft

More Related