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<br />- <br />xi <br /> <br /> <br />Contents <br /> <br />EXECUTIVE SUMMARY... ......... ......... ......... ......... ...... ................ ..1 <br /> <br />1 SACRAMENTO AND THE STRUGGLE TO <br />MANAGE FLOOD RISK.......................................................9 <br />Settling in the Floodplain, 9 <br />Risk Reduction Efforts, 9 <br />Current Planning Efforts and Controversies, 11 <br />Technical Issues and Policy Implications, 13 <br /> <br />2 DATA SOURCES...............................................................16 <br />General Description of Flood Frequency Data, 16 <br />American River Data, 24 <br />Summary, 37 <br /> <br />3 FLOOD FREQUENCY ESTIMATES FOR <br />THE AMERICAN RIVER............ .................................... .....39 <br />Introduction, 39 <br />Bulletin 17-B, 40 <br />Expected Probability, 44 <br />Summary of Committee Approach, 44 <br />Analysis of American River Data, 45 <br />Summary, 64 <br /> <br />4 CLIMATE AND FLOODS: <br />ROLE OF NON-STATIONARITY.................. ........................67 <br />General Meteorological 'Features of Major Floods, 68 <br />Observed Climate and Streamflow Variability, 73 <br />Sources of Sierra Nevada Climate Variability, 86 <br />Global Changes Issues, 94 <br />Summary, 97 <br /> <br />5 SUMMARY AND RECOMMENDATIONS........................... 101 <br />Recommended Flood Frequency Distribution, 101 <br />Beyond Bulletin 17-B, 102 <br />