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<br />(- <br /> <br />. . <br /> <br />. <br /> <br />. <br /> <br />RECOMMENDED PROCEDURE <br /> <br />( <br /> <br />The USGS gage, East River at Almont (gage no, 09112500) can be used to predict daily <br />streamflow at the upstream East River site, The gage is lower in elevation and is generally "ice- <br />free" for all or part, of the snowmaking season, Further, the gage is on the State's satellite <br />network and streamflows can be ascertained on a real-time basis. <br /> <br />To determine if the gage at Almont could be used as a reUable basis to predict upstream flows, a <br />regression analysis was completed, The analysis utilized streamflow measurements at the <br />snowmaking diversion site as recorded by Hydrography Resources and others, In total, 18 <br />observations over the period October 1985 through October 1991 were used and correlated with <br />records from the USGS gage, East River at Almont (Attachment 11, The analysis was confined <br />to the snowmaking season, October through December. Altliougti'~dd;tjorial '!Ieas~renlf;lrts oWei8 <br />..._..,____ _ ~ _.....".. H.__..... <br />available at the upstream site during the summer it was felt that they would not be representative' <br />of base-flow comfltions and would not correlate well to the downstream gage due to 'agricultural <br />diversions and associated return flows, . <br /> <br />The regression equation developed for the site is: <br /> <br />. "" <br />yco;. 0,18 X if. 1.70 "v <br /> <br />Where: <br /> <br />Y = Correlated flow at the pumping station lctsl <br />X = Measured flow at the East River at Almont gage lctsl <br /> <br />l <br /> <br />The correlation coefficients of the regression is: R2 = 0,98. 'This indicates that there is an <br />extremely good correlation between the base flow at the two sites and that the Almont gage can <br />be used to reliably predict f1ow.at the upstream diversion.site-. The attached figure graphically <br />displays streamflows at the two sites and compares actual streamflow at the pumping station to <br />predicted flows using the regression equation, <br /> <br />Implantation of this procedure would be as follows: <br /> <br />L <br /> <br />During the period of anticipated snowmaking diversion, the streamflow at the East River at Almont <br />gage would be determined by calling the State's Water Talk network. This consists of the <br />following procedures: <br /> <br />. <br /> <br />3 <br /> <br />.... <br />