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<br />500 <br /> <br />450 <br /> <br />400 <br /> <br />350 <br /> <br />Flood Damages Prevented by <br />Main Stem Reservoirs <br /> <br />Total Damages Prevented <br />By the Main Stem Dams <br />Since Construction is <br />2.7 Billion Dollars. <br /> <br />500 <br /> <br />450 <br /> <br />400 <br /> <br />350 <br /> <br /> 300 300 <br /><f) ;:: <br />a: <br />'"' r <br />~ 250 r <br />~ 250 0 <br />0 z <br />0 0 <br />Z 0 <br />0 200 200 r <br />~ ';; <br />~ <br />:;, JJ <br /> (f> <br /> 150 150 <br /> <br />100 <br /> <br />50 <br /> <br /> <br />o <br /> <br />100 <br /> <br /> <br />50 <br /> <br />o <br /> <br />~~w~~~~.ronMreffiw~~~~ <br />CALENDAR YEARS <br />Figure 3. Flood Damages Prevented by Main Stem Reservoirs <br /> <br />Doe:,> th", sy~tf'm work'? The ha~ic operatin!! plan for <br />tlood control 1:< to "IOTe watN during the biggest run- <br />off.... The fed chart:; on top ",how the Oow!' that would <br />have occurred without regulation. Tht'~t" are 8\"fi'Ti1ge <br />weekly \'a]ue". Down below we also haw 8wr8gt' <br />weekly '-aha'" of rPle-ash- from (;I1\-io,. Point. t j!\1t'S'" <br />it's really quite plain to see that the highest flows are <br />simply chllPPf'd off. If WI;' would take II look at spffiflC <br />Yt'ar... Iikt' 19,;), we had a 110w that would han- hft.n <br /> <br />2B <br /> <br />145,000 ds. and we relea;;f'd a maximum 60.000. That <br />additional water went into storage. The rel('ases were <br />not made durin~ tht:' flood pt'riod. they WNf' made <br />throughout the ,",ummf'r and fall pt'riod. We can take <br />a look at 197'; and !'f'f' thf' opposite where we had very <br />low runoff durin~ the year and would have hfld wry <br />low flows throu~hout much of tOf' year hecau"e of the <br />drought situation. but water wa.. rt:'lf'a"t:'d from "'toragf' <br />in order to provide suitable watN for hydropower gen- <br />