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Platte River Ecosystem Resources and Management, with Emphasis on the Big Bend Reach in Nebraska

Figures

Figure 14. The acre-foot re-regulation credits and debits measured using 1994 USFWS wet/average and dry instream flow recommendations (IFR) (weighted monthly average) with and without the 30-day pulse target flows (average pulse flow of 3,350 and 2,250 cfs for wet/average and dry years, respectively, during 14 February - 15 March; 30-day duration of 3,000 cfs for wet/average years during 20 May - 20 June) and based upon the Opstudy model (FERC 1994b) (M. Butler, USFWS, personal communication). Comparing each monthly flow in each Kingsley alternative with IFR in effect for that month produces the instream flow shortages (M. Butler, USFWS, personal communication). The IFR were used in two separate calculations: one with and one without the 30-day pulse flows. The calculations were further separated into two other classes: a 1:1 relationship between increases and decreases in the average shortage for a particular month (e.g., a decrease in shortage (a credit of 10,000 acre-feet during, for example) during one month is zeroed out by an increase in shortage (a debit of 10,000 acre-feet) in another month; the without pulse flow calculation gave more credit to decreasing shortages in higher priority months, and less debit for increasing shortages in lower priority months (e.g., decreasing the shortage in any month was given full credit of 1, and increasing the shortage was debited by .5 for the lower priority months of October through January, and 0.75 for the months of Februrary and September). Depending on the inclusion or exclusion of pulse flows and the credit and debit factor, the Nebraska Plan, for example, scored a credit of 11,000-31,300 acre-feet. Values are for each of th FERC alternatives in FERC's supplemental revised draft environmental impact statement (SRDEIS): Districts (Centrat Nebraska Public Power and Irrigation District and Nebraska Public Power District); Nebr. Plan (Nebraska Plan); Mod. Nebr. (Modified Nebraska Plan); Interior (U.S. Department of the Interior); NGPC (Nebraska Game and Parks Commission); Mod. NGPC (Modified NGPC); Trust (Platte River Whooping Crane Habitat Maintenance Trust, Inc.); Cons. Int. (Conservation Intervenors); Instream Enh. (Instream Enhancement Alternative).

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