1. Virginia Smith CE397 – Spring 2009 Sediment in the Trinity River Basin 1 Virginia Smith CE 397

2. Outline The Trinity River Basin Sediment Data Trends of the Main Channel Trends of the Catchments Conclusions 2 Virginia Smith CE 397

3. The Trinity River Basin Large population and growing Lots of agriculture 80-90% of the basin’s water supply is from surface water 28 water supply reservoirs The first was in 1911 The master planning has 13 remaining reservoirs to built 3 Virginia Smith CE 397

4. Sediment Data in the Basin 4 Virginia Smith CE 397

5. Classifying the Gages 5 Virginia Smith CE 397

6. Mainstream Sediment Gages 6 Virginia Smith CE 397

7. Sediment Rating Curves 7 Virginia Smith CE 397

8. Dam Influence 8 Virginia Smith CE 397

9. Dam Influence 9 Virginia Smith CE 397

10. Catchment Sediment Gages 10 Virginia Smith CE 397

11. 11Virginia Smith CE 397

12. 12 Virginia Smith CE 397

13. Delineating Catchments 13 Virginia Smith CE 397

14. Natural Regions 14 Virginia Smith CE 397

15. Land Cover 15 Virginia Smith CE 397

16. Data Attached to Counties 16 Virginia Smith CE 397

17. Regression Variables Collected Hill slope Storm Depth Vegetation Density Precipitation Precipitation Intensity Urban Land Agricultural Land Forested Land Variance Inflation Factors 17 Virginia Smith CE 397

18. Correlation Precipitation / Precipitation Intensity / Vegetation Cover Density Hill slope/Erosion Rate Agriculture and Forest Land 18 Virginia Smith CE 397 HillslopeAvg Flood DepthErosionsVegetationPrecipitationPrecip IntensityUrbanAgricultureForest Hillslope1 Average Flood Depth0.0496180271 Erosions (Tons/year)-0.945676986-0.1802319231 Vegetation Cover Density0.0806619810.437504042-0.248314311 Precipitation (mm/month)0.2945485910.535482799-0.4052056220.9355888421 Precipitation Intensity (mm/month)0.2114154130.614652211-0.3129900390.9268534570.9879107611 Urban-0.674306514-0.629634540.787740771-0.123992128-0.300847371-0.2728271881 Agriculture-0.267466777-0.5151510670.246934188-0.636449602-0.75880502-0.7901643590.2411002671 Forest0.1218453420.454508258-0.1554172630.8584824470.8376302660.87813502-0.033591021-0.7723902921

19. Regression SAS Conc. = Hill slope*(5.16) t=5.16 R 2 =0.792 p-value = 0.0013 F = 26.65 Excel matched the results of SAS 19 Virginia Smith CE 397

20. Conclusions Virginia Smith CE 397 20 Sediment Rating Curves: a greater slope means a higher concentration Dams have influenced the transport of sediment in the main channel Hill slope is the main influence of sediment in the Trinity River Basin

21. Questions Virginia Smith CE 397 21

22. Mainstream Flow Duration Curves 22 Virginia Smith CE 397

23. SAS Regression Data Virginia Smith CE 397 23

24. Excel Regression Data Virginia Smith CE 397 24 SUMMARY OUTPUT Regression Statistics Multiple R0.889925 R Square0.791967 Adjusted R Square0.64911 Standard Error0.725048 Observations8 ANOVA dfSSMSF Significan ce F Regression114.00899 26.64850.00209 Residual73.6798660.525695 Total817.68885 Coefficien ts Standard Errort StatP-value Lower 95% Upper 95% Lower 95.0% Upper 95.0% Intercept0#N/A Hillslope0.0102860.0019935.1622190.0013060.0055750.0149980.0055750.014998

25. Storm DepthData Virginia Smith CE 397 25 Storm Depth Rainfall depth during a storm L moment statistics Based on hourly rainfall during the storm duration Data Data by county Data in inches

26. Correlation Virginia Smith CE 397 26 Spearmans Rho HillslopeAvg Flood DepthErosionsVegetationPrecipitationPrecip IntensityUrbanAgricultureForest Hillslope1 Average Flood Depth-0.309521 Erosions (Tons/year)-0.42860.333331 Vegetation Cover Density-0.03615-0.09639-0.289181 Precipitation (mm/month)0.469910.14459-0.405970.634151 Precipitation Intensity (mm/month)0.3560.31917-0.50330.484560.906991 Urban-0.571430.428570.73810.12049-0.09639-0.257791 Agriculture-0.21429-0.619050.07143-0.27713-0.6627-0.61379-0.33331 Forest-0.285710.571430.285710.48196 0.392820.7619-0.642861 Kendall's Tau HillslopeAvg Flood DepthErosionsVegetationPrecipitationPrecip IntensityUrbanAgricultureForest Hillslope1 Average Flood Depth-0.214291 Erosions (Tons/year)-0.571430.214291 Vegetation Cover Density-0.07412-0.14825 1 Precipitation (mm/month)0.370620.14825-0.29650.538461 Precipitation Intensity (mm/month)0.231460.30861-0.385760.360290.840671 Urban-0.50.428570.642860.07412-0.07412-0.15431 Agriculture-0.146286-0.357140-0.22237-0.51887-0.46291-0.214291 Forest-0.214290.28570.357140.37062 0.308610.57143-0.642861

27. NCRS Dams 27 Virginia Smith CE 397