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<br />t:;~~} <br /> <br />w <br />~, <br />r::p, <br /> <br />6/r:~., <br />'~:~;....'.' <br /> <br />"...... <br /> <br />Outflow - 24" sharp crested weir, float & pulley, Omnidata <br />datapod 115: operational during all 8 irrigations. <br /> <br />site 19 <br />Inflow - 9" parshall flume, potentiometer, Omnidata datapod <br />115: operational during all 5 irrigations. <br />Outflow - 9" parshall flume, potentiometer, Omnidata datapod <br />lis: operational during aIlS irrigations. <br /> <br />site 20 <br />Inflow - 12" broadcrested weir, potentiometer, ,Omnidata datapod <br />312: operational during all 7 irrigations. <br />Outflow - 9" parshall flume, potentiometer,Omnidata datapod <br />312: <br />operational during all 7 irrigations. <br /> <br />Site 21 <br />Inflow - CSUCE flow meter: operational during all 4 <br />irrigations .' <br />Outflow - 10" broadcrested weir, potentiometer, Omnidata <br />datapod 312: operational during all, irrigations. ' <br /> <br />Site 22 <br />Inflow - CSUCE flow meter: operational during all 5 <br />irrigations. Outflow - 12" broadcrested weir, float & pulley, <br />Omnidata datapod 115: operational during all 5 irrigations. <br /> <br />statements and Challenges <br />,The 1992 field season was the first year of implementation for <br />the CSUCE Lower Gunnison surge demonstration project. The <br />Lower Gunnison Basin Surqe Demonstration. Proqram <br />AccomDlishments ReDort for Calender Years 1992-1993, is an <br />excellent source of information for reference. <br /> <br />The following summary statements are drawn from LGCU monitoring <br />activities, the above mentioned surge report and the GVCU 1992 <br />report. <br /> <br />1) Over irrigation does occur, perhaps due in part to a <br />normally abundant supply of inexpensive irrigation water. <br /> <br />2) Low irrigation efficiencies are are due to irrigation water <br />being applied prior to the soil moisture reaching the 50% <br />available water stage and due to applications which continue <br />after field capacity has been reached. <br /> <br />3) During pre-irrigation of annual crops and first irrigation <br />of perennial crops for stand establishment (e.g. alfalfa), <br />many farmers in the Lower Gunnison apply a large amount of <br />water to "black over" the soil so that seeds have adequate <br />moisture for germination and establishment. The <br />elimination of this practice would reduce deep percolation <br />substantially (see #5). However, farmer accepted <br /> <br />13 <br />