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<br />,:,.T "/ <br /> <br />C. <br /> <br />~.r::"""-~;:-:-; It~ P'f 'I;:' r,'-;:r{U <br />~ H ~.', .. ~ f.': t', ' r, ~ -- ~ <br />rj~[UIV!ar~AJ\ ~ <br /> <br />'e <br /> <br />Mr, Jesse <br />/",2 :-ch 10, 1580 <br />Page 7 <br /> <br />~ ~==?' <br />r \Q)~ \ t <br />\DJuuul\J'J <br /> <br />that time. Table 1 gives the discharges by month for the wc~er years <br />1~c,7 through lQ-'j8. -h d ...I . b t' ~\.. t h <br />__ _ t e raincge area cOfllman....ea y ne Ilia c. el" gage <br />a~ounts to 1935 square mi les cs opposed to the Trinicad gage which <br />cc~m2nds an area of 795 square miles. These figures show that there <br />is a total of 1140 square miles of wate:-shed between the two gaging <br />stations. Therefore, the flew at Thatcher es~en:ially comes frOG two <br /> <br />1T:2in sources: <br /> <br />the ,-es i dua 1 flo\" in the me ins tern of the Pu rg<3 to ire <br /> <br />CCC,'iilstre2:<i from the Trinidad Project and side-channel inflovJ. Sicie- <br />c;;a;-lnel inflovJ is primarily depencent upon excess precipitation. The <br />resicl.!2l floVJ of the main ste.'T1 cf the Purgatoire is dependent upon <br /> <br />t~e flow at Trinidad and depletions between Trinidad and-Thatcher. <br /> <br />As might be expected a good direct ccrrelation between the flo~s <br /> <br />2: Thatcher and the flews at Trini~a~ ~oes not exist. This is quite <br /> <br />2?parent when inspecting a plot of the respective discharges at the <br /> <br />e <br /> <br />~, 0 s ~ - ~ . ( ,- . <br />~'d' Lc~lons rlgure <br /> <br />1). In an effort to find a reliable means of <br /> <br />cetec:iilS cnanges of <br /> <br />d;scncrge 2t Thatcher v;hich could be attributed <br /> <br />to operation of the Trinidad Project, two basic methocs were e~ployec <br />toestimate the flow at Thatcher and indicate a possible expanded use <br />by the Trinidad Project area wcter users. Three additional suggestions <br />are also made to determine or verify the cause of a chanqe in the flo'.'1 <br />at Thatcher from vJnat it would have been wi thout the Project. <br /> <br />ESTIt-IATING TH.L\TCHER FLOW <br /> <br />T"JO methods of estimating the flO\" or the Purgatoire at Thatcher <br />have been developed. Due to the vagaries of nature, it is not possible <br />to predict exactly the streamflow at the Thatcher gage by utilizing <br />precipitation and streamflow correlations. Therefore, the following <br /> <br />methods should only be used as approximations of what the flow at <br />Thatcher would have been without the Project. These methods should only <br />be used as an indicator of possible expanded use if the actual difference <br /> <br />e <br />