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JUL -08 -2002 MON 0913 AM FAX NO, P. 17 <br />AT'J'ACLIMEN`1' C <br />(From Bowniall and Carlson, 1994) <br />f411:►1c 3. 1'ttlsc flow 1z.co1l�mc:ncic►tion 'f`or the central Platte River Valley ccosystc;m during l�ebrualy <br />and March. <br />. _ - -- - - -�-� P'low Duration Recurronce(yrs) <br />Porioci �- sY) - Exceedcncc 'C/�) -- <br />very west Feb 1 - March 31 16,000* 5 ** 1 in 5 (20 %) <br />wet Feb 15 - March 15 12,000* 5 *1` 1 in 2.5 (40 %) <br />1'1)1'111411 176) 15 - March 15 3,100 -3,600 30 3 in 4 (75 %) <br />dry lycb 15 - March 15 2,000 -2,500 30 all remainiAg (100' %) <br />At lctlst 5(,)% ol, these ptl lsc flows should occar during May 20 to June 20, with May 1 to <br />J unc; 30 u1 the tina c franc For broadest benefit for chanacl maintenance, and instream and wct <br />n1c:4jcloW tl4zbitats. OCCUrrence between Fcbru.uTy I an(1 June 30 would accomplish the <br />1►cce s41ry cffc:cls for ehanitel mainlccZaltce, The 107year running average for the moan annual <br />pIllsc 11c)w tat °gets s-hoWd Tall€;C from approximately 8,300 cfs to 10,800 cfs. <br />11 The duration of tlics'c 1)11180 I10ws s1'1o111d emulate the historic, natural pattel,�; (a) asccudecl <br />ovur approximately 10 days, (b) cresting for approximately 5 (lays, and (c) descending over <br />approximately 12 days. <br />16 <br />