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<br />TABLE OF CONTENTS <br /> <br />LETTER OF TRANSMITTAL <br /> <br />Sect ion <br /> <br />Ti tIe <br /> <br />~age . <br /> <br />SUMMARY <br /> <br />Urban Drainage and Flood Control District <br />Recommended Solution <br />Phase A Synopsis <br />Phase B Synopsis <br />Planning Variations <br /> <br />1-1 <br />1-2 <br />1-3 <br />1-5 <br />1-9 <br /> <br />II LENA GULCH DESCR I PT I ON <br /> <br />General Comments <br />Basin Description <br />Special Considerations/Hazards <br />General Conclusions <br /> <br />I 1- 1 <br />II - 3 <br />11-10 <br />I 1-12 <br /> <br />III HYDROLOG I CAL SUMMARY <br /> <br />General Comments <br />Lena Gulch Flood Hydrology <br />Streamflow Sensitivities <br /> <br />111-' I <br />III -. 2 <br />111-' 9 <br /> <br />IV FLOOD PLAINS <br /> <br />General Comments <br />Water Surface Profiles <br />Flood Damages <br /> <br />IV- I <br />I V.. 1 <br />I V- 2 <br /> <br />V CRITERIA <br /> <br />Introduction <br />Structural Cri teria <br />Non-Structural Criteria <br /> <br />V.. 1 <br />V.. 1 <br />V- 6 <br /> <br />VI PHASE A ALTERNATIVES <br /> <br />General Comments <br />Alternatives Investigated <br />Three Alternatives Designated <br /> <br />Vi- I <br />111- 2 <br />111- 7 <br /> <br />VI I BENEFIT COST ANALYSIS <br /> <br />Explanation <br />Unit Costs <br />Operation and Maintenance Costs <br />Secondary Benefits <br />Intangible Benefits <br />Flood Damages of Al te rna t i ves <br />Comparison Summary <br /> <br />V 11- 1 <br />V 11- 2 <br />II 11- 4 <br />V 11- 5 <br />V II - 8 <br />II 11-14 <br />VII -15 <br />