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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Section <br /> <br />I <br /> <br />II <br /> <br />III <br /> <br />IV <br /> <br />V <br /> <br />TABLE OF CONTENTS <br /> <br />Description <br /> <br />I NTROOUCTI ON <br />Ten-Year Channel Design. . , . . . <br />Leyden Lake. , . . . . . . . <br />Hydrologic and Design Consistency. <br />Acknowledgments. . . . . . . . . . <br /> <br />BASIN DESCRIPTION <br />General Basin Description. <br />Ralston Creek, . <br />Leyd en Creek . . <br />Van Bibber Creek <br /> <br />HYDROLOGICAL SUMMARY <br />General. . . , . . . . . . . . <br />Ra i nf all . . . . . . , , , , , <br />Infiltration. . . . . . . . . <br />Determination of Design Floods <br />Flood Hydrology. . , . . <br />Present Condition~. . . . <br />Future Conditions . , . . <br /> <br />HYDRAULIC ENGINEERING AND FLOODPLAINS <br />Introduction . . . . . . . . <br />Hydraulic Analysis. . . . . <br />Methodology. . . . . . <br />Floodplain Delineation. . . . . . . <br />Del ineation of Improved Floodplains <br />Description of Reaches . . <br />Ral ston Creek . . . . <br />Leyden Creek. . . . . <br />Van Bibber Creek. . . <br />Floodplains and Floodways. <br /> <br />MASTER PLAN DEVELOPMENT <br />Introduction . . . . . . . . . . . <br />Phase A Study. . . . . . . . . . . <br />Purpose of the Phase A Study. <br />Altern at ives Eval uated. . . . <br />The Phase A Recommended Plan. <br />Phase B Direction. . . <br />Design Criteria. . . . <br />Introduction. . . <br />Planning Criteria <br />Design Criteria. <br /> <br />Page <br /> <br />I-I <br />1-2 <br />1-2 <br />1-2 <br /> <br />II-I <br />II-I <br />11-1 <br />II-2 <br /> <br />VI <br /> <br />III-I <br />III-l <br />II 1-3 <br />III -3 <br />II 1-3 <br />II 1-3 <br />II I -3 <br /> <br />IV-l <br />IV-2 <br />IV-2 <br />IV-2 <br />IV-2 <br />IV-2 <br />IV-2 <br />IV-3 <br />IV-4 <br />IV-5 <br /> <br />V-I <br />V-I <br />V-I <br />V-2 <br />V-2 <br />V-3 <br />V-3 <br />V-3 <br />V-3 <br />V-4 <br /> <br />TABLE OF CONTENTS <br />( Continued) <br /> <br />Unit Costs and Cost Estimates. V-4 <br />Unit Construction Costs . V-4 <br />Right-of-Way Costs. . . . V-4 <br />Operation and Maintenance Costs V-5 <br />Cost Estimates. . . . . . . . . . . . . V-6 <br />Floodplain Management, Preservation and Regulation V-6 <br />Flood Forecasting and Warning Systems. . . . . . . V-6 <br /> <br />DESCRIPTION OF PROPOSED PROJECT VI-l <br /> <br />APPENDIX A - LEGAL OPINION <br />APPENDIX B - REFERENCES <br /> <br />ATTACHMENT A - DRAWINGS - Major Drainageway Planning and Flood <br />Hazard Area Delineation <br /> <br />ATTACHMENT B - TEXT <br /> <br />- Flood Hazard Area Del ineat ion <br />Ralston Creek Above Leyden Creek <br /> <br />ATTACHMENT C - DRAWINGS - Flood Hazard Area Delineation <br />Ralston Creek Above Leyden Creek <br />