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• <br />JUL -08 -2002 MON 09:13 AM <br />FAX <br />ATTACHMENT 13 <br />(Front l3owma)a and Carlson, 1994) <br />Tl ihlc; 2. <br />Pulse: {TONY recoil irnendation for the central <br />Platte River Valley ecosystem during May and <br />171ow �Y <br />Duration <br />hregllcncY (Yr'S)�N^ <br />vor Y wet1 <br />~— M�ty I - June 30°x' <br />> 16,000 <br />5 ** <br />1 in 5 (20 %) <br />wet <br />:May l - June 30* <br />>' 12,000 <br />5�`A` <br />1 in 2.5 (40 %) <br />rlolru'll <br />M-,:iy 20 - Junc 20 <br />> 3,000 <br />7 -30 * ** <br />3 i1i 4 (75 %) <br />dry <br />May 11 - JL1110 30 <br />none * * ** <br />all reY aillltlg (100%) <br />*At least 50% of tluse pulse flaws should occur during May 20 to June, with May 1 to June 30 as the <br />tir)1L.fmanic for 1)roadset bone.f)t (or channel nlalntcriance, i)nd 1ns[rcal -ri and wet meadow habitats. Occurrence <br />l)e[wcen l "ehrui.lry 1 and Jung 30 woc)ld accomplish the necessary effects for channel nl3intC0a11ce. The 10- <br />ycnr 1-urn)ing avti:rage for the nlcan alliLial plalse flow targets should range iron]. 81)1)roximately 8,300 cfs to <br />10,F00 cfs. <br />o'The dur;atian of these pulse flows should emulate the historic, natural patlel n' (a) ascended over <br />..11)j)roximaik�ly 10 days, (b) eri:sting for alproximately 5 days, and (c) descending over approximately 12 <br />days, <br />• <br />:k.i °* '1'hc target is for a. 10 -year runnilig average for the 30 -day exceedence flow (i.e., 10 -ye,,ir running <br />average of t11c arinrlal level exceeded for 30 colisecutive days) of at least 3,400 efs. A flow of 3,000 cfs <br />sliould be exccccic)d for 7 -30 days ii at least 75% of years. Pulse flows should be followed by dcsccnclir)g <br />110w , ;)1,1)1-oxi1nt11 ilia a rate of goo c fs /day. <br />NV 1)ulse, (lows during May and June in driest years; target flows icicntified in the March 1994 <br />worh5l)op (13ow n1s.u1 1994), apply u11der dry year conditions. <br />15 <br />