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<br />,~,', ; <br /> <br />, <br /> <br />CONTENTS <br /> <br />Page <br />Abstract---------------------------------------------------------------- 1 <br />Introduction--~-----------~--------------------------------------------- 2 <br />Purpose and scope------------------------------------------------------- 2 <br />Methods of study-------------------------------------------------------- 3 <br />Study plan--------------------------------------------------------- 3 <br />Site selection and location---------------------------------------- 3 <br />Description of the study watershed---------------------------- 3 <br />Delineation of hydrologic-response units <br />and development of test plots------------------------------------ 5 <br />Development of runoff data from rainfall simulator----------------- 7 <br />Model application to plot runoff----------------------------~~----- 9 <br />Overland-flow routing----------------------------------------- 10 <br />Results of model calibration-------------------------------------------- 12 <br />Calibration using rainfall-simulator data-------------------------- 12 <br />Calibration using observed rainfall-runoff data-------------------- 33 <br />Comparison of results of plot calibrations----------~-------------- 40 <br />Watershed modeling--North Fork Willow Gulch----------------------------- 40 <br />Partitioning the watershed----------------------------------------- 40 <br />Comparison of observed and simulated runoff events----------------- 44 <br />Sources of etror--------------------------------------------------- 49 <br />Results and conclusions------------------------------------------------- 49 <br />References-------------------------------------------------------------- 59 <br /> <br />Figure <br /> <br />ILLUSTRATIONS <br /> <br />1. Map of Willow Gulch drainage basin <br />and location of instrumentation----------------------- <br />2-4. Photographs showing: <br />2. Grass cover on plot 1, Willow <br />Gulch study watershed----------------------------- <br />3. Close-up view of sod cover on plot 3, <br />Willow Gulch study watershed---------------------- <br />4. Rainfall simulator in operation, plot 2, <br />Willow Gulch study watershed---------------------- <br />5. Graph showing model calibration of simulator <br />runs, plot 1, 1981------------------------------------ <br />6. Graph showing model calibration of simulator <br />runs, plot 2, 1981------------------------------------ <br />7-12. Diagrams showing the sensitivity of calculated runoff: <br />7. To changes in model parameters <br />and precipitation-------------------------------- <br />8. To changes in KSAT--------------------------------- <br />9. To changes in P------------------------------------ <br />10. To changes in WINT--------------------------------- <br />11. To changes in SURF------------------------------~-- <br />12. To changes in FRIC--------------------------------- <br /> <br />11i <br /> <br />Page <br /> <br />4 <br /> <br />6 <br /> <br />6 <br /> <br />7 <br /> <br />13 <br /> <br />14 <br /> <br />15 <br />17 <br />18 <br />19 <br />20 <br />21 <br />