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<br />Page 2 - Mr. Mack Graham <br /> <br />site carefully read and record the flows at various times throughout <br />the irrigation season, <br />For the South Branch of St. Vrain Creek we would recommend <br />installing two 5' X 30" Parshall flumes, one near the upstreaR (west) <br />WPCC property line, and one near the downstream (east) property line. <br />To adequately assess seepage losses in this reach, it will also be <br />necessary to have a measuring flume on each of the ditches which <br />• divert from the South Branch within this reach, The above described <br />flumes on the Clough and True would be adequate for that ditch, and <br />~el.rG rJ Pr. y.t] r: <br />the tname unknown drtch which diverts just above the east property <br />line already has an adequate flume in it, Chuck Atkins indicated <br />the other day that he now has two flumes which he will install in the <br />Goss #1 and Goss #2 ditches. Al] of these flumes will be required to <br />determine the seepage losses. <br />The 5' X 30" flumes for the South Branch are also stock items at <br />Thompson Pipe and Steel Company, and cost $760 each. Because the <br />South Branch is a live stream throughout the year and is subje:et to <br />flash flooding at times, we would recommend that these flumes be <br />~~ installed with concrete bases and wing walls. I have enclosed a rough <br />sketch showing a similar flume installation which will give you an <br />idea of what is needed as far as concrete work, etc. 1 have estimated <br />that each flume would require placement of about 3 c,y, of concrete <br />and would require about 35 l,f. of 4 X 4 timbers, some miscel~aneous <br />reinforcing steel, anchor bolts, and riprap. The earthwork r~:quired <br />to divert the stream around the flume area during construction could <br />be done with the backhoe now at the site. Since you indicated that <br />you will have a construction crew at the site doing same concrete <br />work later this month, I will leave it to you to assess the cost of • <br />this work. <br />As with the Clough and True ditch, we could not recommend putting <br />recorders on these flumes. To obtain continuous loss data over extended <br />periods of time, it would be necessary to put recorders on the two <br />