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Differences in Distribution of Three-Day Peaks, Platte River at Overton, <br />under the Four Opstudy-Modeled Scenarios <br />Opstudy-estimated impacts on three-day annual peak flows in the Platte River at Overton <br />resulting from future water development and depletion plan replacements in Colorado, <br />Nebraska, and Wyoming (PA #2A and PA #2B), are illustrated below. <br />3-Day Annual Peak Flows at Overton, as modeled by OpStudy <br />28,000 <br />24,000 <br />v 20,000 <br />Y <br />10 <br />a 16,000 <br />Y <br />!0 <br />a 12,000 <br />M <br />C <br />{7 <br />? $,000 <br />4,000 <br />0 <br />0 <br />? <br />? <br />? <br /> <br /> ti <br />\ <br />! <br /> y , <br />t <br /> <br /> <br />4 8 12 16 20 24 28 32 36 40 44 48 <br />Ranked Years <br />---- Reserri Cond Prog Alt 2 Prog Alt 2A Prog Alt 2B <br />The model confirms negative impacts to three-day annual peaks above about 9,500 cfs, <br />relative to both the Present Condition and Program Alternative 2. For annual peaks <br />between 5,500 and 8,000 cfs, slight improvements are suggested. The Opstudy model <br />may somewhat under-estimate reductions in the highest short-duration peaks, but we <br />believe it accurately reflects likely impacts to the remaining, Program-influenced peaks. <br />4