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<br />. ' <br /> <br />J <br /> <br />The January 19!17 Floods <br /> <br />NASER BATENI BOB ZE1TIEMOYER. and <br />staff from D~' 5 FloOd Center contributed to <br />this (1rticle. Nw;,r is the Chief of DWR's <br />Northern Distrir. t and Bob is a senior engineer <br />in DWR's Statell.Jide Pronning Branch. <br />~ <br /> <br />Warm tropical storms during early <br />January 1997 caused widespread <br />flooding in the Celltr~ Valley when <br />levees broke on the Sacramento and San <br />Joaquin rivers and their'tributaries. The <br />following graphs compare the January <br />1997 flood wtth historic flood events for ~ <br />.' sele'Cted river basins, and illustrate how <br />, major water stprai~e reservoirs were <br />operated for flood control. (Some of the <br />values sho"(Il on the graphs may <br />represent prelilninary hydrologic data. <br />and are subject tc revision when the <br />- - <br /> <br />I <br />I <br /> <br />fmal hydrologic records have been <br />tabulated and reviewed.) / <br /> <br />Table 2 compares runoffwtth up- <br />stream storage capacity for selected river <br />systems. to illustrate the degree ofwaler <br />management possible on each tiver sys- <br />tem.' <br /> <br />These graphs are presented in <br />response to suggestions by members of <br />i;he Bulletin 160-98 Advisory Committee <br />that the bulletin depict nonwater supply <br />benefits of multipurpose water <br />projects-such as,water supply reservoirs <br />, which provide flood control benefits. As <br />the graphs indicate. the reservoirs shown <br />provided significant attenuation of flood <br />peaks for downstream communities. <br /> <br />/ <br /> <br />Table ~:. Maximum Historical Runoff vs. Storage Capacity for Selected Rivers <br />/ <br /> <br />...... <br /> <br />Location <br /> <br />Max. Annual Ave. Annual Total Upstream <br />. Runoff Runoff Storage 1 <br />(in acre-feet) Year (in acre-feet) (in acre-feet) <br /> <br /> <br />. <br /> <br />1 Cumulative storag <br />10,000 af or great <br /> <br />2 Interstate river. sho <br /> <br />upstream of Indicated dam, based on reservoirs with a storage capacity of <br />r. <br /> <br />n for comparison of average annual runoff to storage ratio. <br /> <br />) 6 <br />