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<br />----------------.------------ <br /> <br />comes from two sources: (1) rele!lses from the upper reservoir <br />system; llnd (2) runoff from the dl'ainage area between Alcova <br />Dam and Cllendo Reservoir. The 1973 snowmelt runoff from tne <br />incremental drainage area started about 10 April. Inflow to <br />the reservoir during the next 40 Qays climbed to a peak inflow, <br />on 21 Me.:;, of 14,661 cubic feet P~r second. There were many <br />lesser P~aks on the hydrograph du~ to warming and cooling trends. <br />From lat€; July on, most of the intlow came from upper syst~m <br />releases. Reservoir inflow then Qropped, reaching 2,000 c~bic <br />feet per second in mid-August. Tll.ble 16 shows average monthly <br />inflow and outflow for January thl;-ough October 1973. <br /> <br /> Table :\.6 <br /> GLENDO RES~RVOIR <br /> AVERAGE MONTHLY INFl:.ow AND OUTFLOW <br /> (January through 0ctober 1973) <br />Month Inflow Out flow !~onth Inflow Out f:low <br /> (c.f .s.) (c.f .s.) (c.f.s.) (c.f.s. ) <br />Jan 1,092 2 Jun 7,270 8,9:t3 <br />Feb 1,153 4 Jul 4,467 6,512 <br />Mar 1,261 546 Aug 2,987 7,2;:>4 <br />Apr 1,992 1,'789 Sep 2,105 3,648 <br />May 9,046 4,160 Oct 1,804 11 <br />21. ALCQVA DAM TO GLENDO RESERVOIR, RUNOFF <br /> <br />a. The drainage area between Alcova Dam and Glendo Dam <br />is 4,733 square miles. This area was contributing less than <br />500 cubic feet per second to Glendo Reservoir inflow in early <br />April 1973. There was a heavy Snowpack, however, at all eleva- <br />tions. Plate 17 shows a hydrogra.ph of snowmelt runoff in this <br />reach and a graph of maximum daily temperatures at the Casper <br />Weather Service Office. Maxinnun daily incremental inflow was <br />11,202 Cubic feet per second on 21 May. This was augmented <br />by 3,459 cubic feet per second oU.tflow from Alcova Dam to give <br />the total peak inflow to Glendo Of 14,661 cubic feet per Second. <br /> <br />b. Alcova outflow. The large inflows to the upper system <br />caused the Bureau of Reclamation to repeatedly revise actu.al and <br />anticipa.ted releases from Alcova Dam. Alcova outflow increased <br />from 900 cubic feet per second On 1 April 1973 to over 7,000 <br />cubic feet per second in early J11ne. By the time Alcova releases <br />had reached '7,000 cubic feet per second, the increMental-reach <br />inflow nad dropped to 1,000 cubic feet per second or less. <br /> <br />36 <br />