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<br />TABLE OF CONTENTS <br /> <br />EXECUTIVE SUMMARY <br /> <br />1 <br /> <br />Purpose <br />Scope <br /> <br />3 <br /> <br />3 <br />4 <br /> <br />I. INTRODUCTION <br /> <br />II. ST. VRAIN CREEK HYDROLOGY <br /> <br />7 <br /> <br />Mean Annual Streamflow <br />Wet and Dry Year Streamflow <br />High Flow Periods ..... <br />Low Flow Periods ..... <br />Seasonal Streamflow Variations <br />Frequency of Streamflow Occurrences <br />South Branch of the St. Vrain Creek <br /> <br />7 <br />7 <br />8 <br />8 <br />8 <br />9 <br />11 <br /> <br />12 <br /> <br />12 <br />12 <br />19 <br /> <br />,,,. STUDY AREA HYDROLOGY <br /> <br />Agricultural Land <br />Diversions <br />I rrigation Return Flows <br /> <br />IV. WATER QUALITY 23 <br /> <br />Pollutants Associated with Irrigated Agriculture 23 <br />St. Vrain Creek Water Quality ........ 25 <br />Water Quality of Irrigation Return Flows . . . . . 27 <br />Pollutant Loading to the St. Vrain from I rrigation Return Flows 29 <br />Water Quality Concentrations in the St. Vrain from Irrigation <br />Return Flows ..... 30 <br /> <br />Water Quality <br />Water Quantity <br />Minimum Streamflows <br /> <br />33 <br /> <br />33 <br />33 <br />35 <br /> <br />37 <br /> <br />38 <br />38 <br />38 <br />38 <br />39 <br />39 <br />39 <br /> <br />V. DISCUSSION OF FINDINGS <br /> <br />VI. WATER QUALITY/QUANTITY IMPROVEMENTS <br /> <br />Best Management Practices <br />Improve Conveyance Systems <br />Dead Level Irrigation <br />Sprinkler I rrigation Systems <br />Irrigation Scheduling <br />Surface System Management <br />Tailwater Control .... <br /> <br />iii <br />