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<br />..e <br /> <br />e <br /> <br />e <br /> <br />,.'- <br /> <br />/' <br />( <br />\, <br /> <br />P' ~,r-~ t' ~ it {- I ,\ r.'~ I <br />.. ; I,.' J,~ ;::~- .~"" '!~'.J;:! (' I .... f-' t~..)i W <br />, ~~"~;; . - I ..,it' H I ~ r.' .,~ "'fl <br />\ '. '1 ~ ' ",' b ' i ',,j . <br />j \\li-ti..:.d I J ~ H..t, t Ii <br /> <br />Mr. Jesse <br />Marc;' 10, 1980 <br />Page 9 <br /> <br />[ffi\w rt\ fElf <br />'UJJ Uu if~ ~;2. U <br /> <br />desree oT 20,000 acre-feet had been aVc:i1able and in use thro,ughout <br />the stu~y period. With the Pr~ect in operation, an estimate of what <br />the flow at Thatcher would have been without the Project is determined <br />by adding t'-e estimated modified residual floN fior.1 Figure 4 to the <br /> <br />estim2ted side-chennel inflow from Figure 2. <br /> <br />In the future it wi II be <br /> <br />necessary to correct the Trinidad Sage for ariy change in storage and <br />evaporation for Trinidad Reservoir prior to using Figure 4. This <br /> <br />i..ro;ii"lctton is re2:cily available frOt71 the Corps or Engineers. It ri,ey <br /> <br />also be necessary to correct for diversions by the City of Trinidad <br /> <br />that bypass the Trinidad stream sage. <br /> <br />In order to deter.i1ine the validity and accuracy of this method, <br /> <br />.I-~o <br />1..1..... <br /> <br />flC'.'1 at Thatcher Vias estimated using Figures 2 2nd 3 Tor <br /> <br />the period <br /> <br />1367-1973 end cOiT:pered vIi th the actucl me25ured flo'..; 2S shO',.~;n in 12::1e 3. <br /> <br />In any particular year the variation between estimated and measured flow <br /> <br />c2n be significant because of the vagaries of <br /> <br />For example, see <br /> <br />n2~ure. <br /> <br />~ne estio.2ted and me2sured amounts for 1967. <br /> <br />The progressive ten year <br /> <br />averages are 2lso shO\-Jn on Table 1. The variation to be expected \'men <br />using this method is at least 4,800 acre-feet on a ten year average <br />basis. The scatter in the basic data is too great to expect any better <br />relationship. Because of the few data points for side channel inflow <br /> <br />in excess of 28,000 acre-feet per year (see Figure 2), this method will <br /> <br />not be very accurate in estimating side channel inflo.'l in excess of <br />28,000 acre-feet. The relationship bet\'Jeen precipitation and side- <br />channel inflow possibly could be improved by using a computer model <br />that would consider the distribution of precipitation during each year. <br />It is a well known hydrological fact that concentration of precipitation <br />both te.'nporally and spatially Hill increase the side-channel inflmv. <br />A word of caution is necessary concerning the method explained <br />above. The person using this method should not expect it to give exact <br />re5~lts. Even on a ten year average basis, the State Engineer should <br />