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Simulation of Streamflow and Estimation of Recharge to The In cooperation with the San Antonio Water System Simulation of Streamflow and Estimation of Recharge to the Edwards Aquifer in the Hondo Creek, Verde Creek, and San Geronimo Creek Watersheds, South-Central Texas, 1951–2003 Scientific Investigations Report 2005–5252 U.S. Department of the Interior U.S. Geological Survey Blank Page Simulation of Streamflow and Estimation of Recharge to the Edwards Aquifer in the Hondo Creek, Verde Creek, and San Geronimo Creek Watersheds, South-Central Texas, 1951–2003 By Darwin J. Ockerman In cooperation with the San Antonio Water System Scientific Investigations Report 2005–5252 U.S. Department of the Interior U.S. Geological Survey U.S. Department of the Interior Gale A. Norton, Secretary U.S. Geological Survey P. Patrick Leahy, Acting Director U.S. Geological Survey, Reston, Virginia: 2005 For sale by U.S. Geological Survey, Information Services Box 25286, Denver Federal Center Denver, CO 80225 For more information about the USGS and its products: Telephone: 1-888-ASK-USGS World Wide Web: http://www.usgs.gov/ Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this report is in the public domain, permission must be secured from the individual copyright owners to reproduce any copyrighted materials contained within this report. Suggested citation: Ockerman, D.J., 2005, Simulation of streamflow and estimation of recharge to the Edwards aquifer in the Hondo Creek, Verde Creek, and San Geronimo Creek watersheds, south-central Texas, 1951–2003: U.S. Geological Survey Scientific Investigations Report 2005–5252, 37 p. iii Contents Abstract . 1 Introduction . 1 Purpose and Scope . 2 Description of Study-Area Watersheds . 2 Simulation Approach . 5 Simulation of Streamflow and Estimation of Recharge . 7 Data Collection and Compilation . 7 Model Construction . 10 Model Calibration and Testing . 12 Streamflow . 12 Hondo Creek Model . 14 Verde Creek Model . 14 San Geronimo Creek Model . 14 Evapotranspiration . 17 Summary of HSPF Process-Related Parameters . 17 Streamflow, 1951–2003 . 17 Recharge, 1951–2003 . 19 Model Limitations and Assessment . 20 Summary. 20 References . 21 Figures 1–2. Maps showing: 1. Location of Hondo Creek, Verde Creek, and San Geronimo Creek watersheds, south-central Texas . 3 2. Land cover in Hondo Creek, Verde Creek, and San Geronimo Creek watersheds, south-central Texas, early to mid-1990s . 4 3. Diagram showing Hydrological Simulation Program—FORTRAN (HSPF) flowchart for (a) impervious and (b) pervious land segments . 6 4–6. Maps showing: 4. Location of data-collection sites used for Hydrological Simulation Program— FORTRAN (HSPF) model calibration, testing, and simulations, Hondo Creek, Verde Creek, and San Geronimo Creek watersheds, south-central Texas . 8 5. Subwatersheds in Hondo Creek, Verde Creek, and San Geronimo Creek watersheds, south-central Texas, for Hydrological Simulation Program—FORTRAN (HSPF) model development . 11 6. Primary rain gages and associated rainfall areas for Hydrological Simulation Program—FORTRAN (HSPF) model calibration, testing, and simulations, Hondo Creek, Verde Creek, and San Geronimo Creek watersheds, south-central Texas . 12 iv 7–9. Graphs showing: 7. Measured and simulated daily mean streamflow at U.S. Geological Survey streamflow-gaging station 08200000 Hondo Creek near Tarpley, Texas, 1992–2003 . 15 8. Measured and simulated daily mean streamflow at U.S. Geological Survey streamflow-gaging station 08200700 Hondo Creek at King Waterhole near Hondo, Texas, 1992–2003 . 16 9. Measured and simulated daily mean streamflow at U.S. Geological Survey streamflow-gaging station 08180590 San Geronimo Creek Reservoir inflow near Rio Medina, Texas, 1992–93 . 18 Tables 1. Process-related model parameters for the Hydrological Simulation Program—FORTRAN . 7 2. Basin-related model parameters for the Hydrological Simulation Program—FORTRAN . 7 3. Data-collection stations used for Hydrological Simulation Program—FORTRAN model input, calibration, and simulations for Hondo Creek, Verde Creek, and San Geronimo Creek watersheds, south-central Texas . 9 4. Sources of rainfall data used to provide missing record and time-step disaggregation for primary rainfall time series used in the Hydrologic Simulation Program—FORTRAN (HSPF) model, Hondo Creek, Verde Creek, and San Geronimo Creek watersheds, south-central Texas . 10 5. Subwatershed drainage areas, Hondo Creek, Verde Creek, and San Geronimo Creek watersheds, south-central Texas . 13 6. Streamflow calibration and testing results, Hydrological Simulation Program—FORTRAN model, Hondo Creek watershed, south-central Texas, 1992–2003 . 23 7. Streamflow testing and recalibration results, Hydrological Simulation Program—FORTRAN model, San Geronimo Creek watershed, south-central Texas, 1992–93 . 25 8. Rainfall and simulated evapotranspiration, Hydrological Simulation Program—FORTRAN model, Hondo Creek watershed, south-central Texas, 1992–2003 . 26 9. Process-related annual parameters for pervious and impervious land segments, Hydrological Simulation Program—FORTRAN models, Hondo Creek and Verde Creek watersheds, south-central Texas . 27 10. Process-related annual parameters for pervious and impervious land segments, Hydrological Simulation Program—FORTRAN model, San Geronimo Creek watershed, south-central Texas . 31 11. Monthly values of lower-zone evapotranspiration (LZETP) parameter, Hydrological Simulation Program—FORTRAN models, Hondo Creek, Verde Creek, and San Geronimo Creek watersheds, south-central Texas . 35 12. Simulated average annual streamflow volumes for Hondo Creek, Verde Creek, and San Geronimo Creek watersheds, south-central Texas, 1951–2003 . 35 13. Estimated annual rainfall and Edwards aquifer recharge, Hondo Creek, Verde Creek, and San Geronimo Creek watersheds, south-central Texas, 1951–2003 . 36 14. Comparison of Edwards aquifer recharge estimates from Hydrological Simulation Program—FORTRAN (HSPF) with historical (Puente method) U.S. Geological Survey recharge estimates for Hondo Creek and Verde Creek watersheds, south-central Texas, 1992–2003 . 37 Simulation of Streamflow and Estimation of Recharge to the Edwards Aquifer in the Hondo Creek, Verde Creek, and San Geronimo Creek Watersheds, South-Central Texas, 1951–2003 By Darwin J. Ockerman Abstract feet (5.04 inches), 26,000 acre-feet (3.36 inches), and 5,940 acre-feet (1.97 inches), respectively. Most of the recharge (about 77 percent for the three watersheds together) occurs as The U.S. Geological Survey, in cooperation with the San streamflow channel infiltration. Diffuse recharge (direct infil- Antonio Water System, constructed three watershed models tration of rainfall to the aquifer) accounts for the remaining 23 using the Hydrological Simulation Program—FORTRAN percent of recharge. For the Hondo Creek watershed, the HSPF (HSPF) to simulate streamflow and estimate.
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