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In L] SPECIES FLOWS Period Wet year' Normal year t Dry year t Jan 1 — Jan 31 1000 cfs 1000 cfs 600 cfs, Feb 1 — Mar 22 1800 1800 1200 Mar 23 —May 10 2400 2400 1700 May 11 —Sep 15 1200 1200 800 Sep 16 — Sep 30 1000 1000 600 Oct 1 — Nov 15 2400 1800 1300 Nov 16 — Dec 31 1000 1000 600 1 "Wet years are defined as the wettest 33 %, "dry" years as the driest 25 %, and "normal" years all others. A method for declaring type -of- conditions in the central Platte in real -time is provided in Attachment G. Annual Pulse Flows Defined as the recommended flows in excess of species flows which! ro,. )%� v� P • Occur in most (75 %) or all years; • Have a duration of 7 to 30 days; • Are in the range of at least 2,000 to 3,600 cfs (varying with frequency -of- exceedance and time of year); and - (N(.0 • May be augmented or created by the Program. fly, 4 Annual pulse flows are a subset of the flows quanti in Table 2 and Table 3 of Bowman and Carlson (1994; see Attachments B and C to thi ocument). They were identified as being important to maintaining the physical structure and other characteristics of the river for biological benefits. The annual pulse flows may be summarized as follows:'_Z-- 5 K4 C, • k "' ANNUAL PULSE FLOWS Exceedance probability Recommended flow in cfs Notes (recurrence interval 75% (3 of 4 years) 3,100 to 3,600 (Feb -Mar) • 30 -day duration for Feb -Mar 3,000 (May -Jun) • 7- to 30 -day duration for May -Jun 3,400 (May -Jun) • 10 -year running mean of 30- consecutive -day exceedance 100% (all years) 2,000 to 2,500 (Feb -Mar) • 30 -day duration for Feb -Mar Annual pulse flows do not include the "peak flows" defined below, except in the sense that pulse flows may encompass the peak flow in years when the timing of the two coincide. In those years, Program- augmented annual pulse flows are likely to improve the peak flow 10 -year running average, improving conditions relative to USFWS running- average recommendations. 3