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<br />w <br />o <br />~::l,:'<':", , <br />C"il""":'",,:'The Team monlto...ed 166 i...rigati.on events th...oughout the season. Total <br />inflow and outflow fo... all 23 sites we...e measu...ed du...ing each <br />i......igation using elect...onic flow reco...de...s and senso...s as desc...ibed <br />above. Each site was well maintained and se...viced, and equipment <br />cal ib...ated and checked to ensu...e accu...ate data.' <br /> <br />The two ...adio telemet...y weathe... stations located on the east and west <br />'ends of the G...and Val'ley measu...ed the cl imatic pa...amete...s nee'ded to <br />calculate potential evapot...anspiration (ETp). The weathe... data fo... <br />calculations of ET data we...e t...ansmitted di...ectly to ~he G...and <br />Junction field office eve...y 15 to 20 minutes f...om the two weathe... <br />st.tions. These data we...e sto...ed in the compute... fo... late... use. <br /> <br />C...op consumptive use f~... each c...op was dete...mined using the Modified <br />Penman equation developed by Ag...icultu...al Resea...ch Se...vice (ARS), Fo...t <br />Col I ins, Colo...ado. The c...op coefficient cu...ves fo... ET calculations <br />we...e developed by the SCS, ARS and the Coope...ative Extension office <br />located in Grand Junction. ' <br /> <br />2. Summa...y of St...eam Gauging Data <br /> <br />'No st...eam gauging data was collected by the SCS. The U.S. Geological <br />Su...vey is ...espons ible 'fo... co II ecti ng st...eam data. <br /> <br />~~;~~?? <br /> <br />3. l......igation Monito...irig and Evaluation <br /> <br />a. Summa...y of the Monito...ing Site Data <br /> <br />App...oxi~ately 350 ac...es were monito...ed in 1991. This ac...eage accounts <br />f 0'" 0 n I y a ve... y sma I I po... t ion .< I e s s t h ani iD 0 f the tot a I a c ... e,a 9 e i n <br />the G...and Va I ley. Refe... to Append i x B fo... i nfo...mat i on on Mesa county <br />ag...icultu...al ac...eage. Th"e average monito...ed site was 15 ac...es. The <br />23 monito...ed sites we...e established in seven diffe...ent soil types, <br />eight diffe...ent i......igation systems and six diffe...ent c...ops. C...ops <br />monito...ed included alfalfa, corn, fall g...ain, g...apes and o...cha...d. <br /> <br />A total of 166 i ......igation events we...e monito...ed in 1991. The ...esults <br />of these i......igation events from 23 sites a...e shown in Table 2 as the <br />1991 Annual Summa...y. The Table p...ovides the annual summa...y of each <br />monito...ed site. I......igation data f...om individual sites a...e p...esented <br />as site summa...y data in Appendix D. Site summa...y data f...om each <br />monito...ed site is compiled and presented in Table 2. The annual <br />i......igation summary fo... the 23 sites in Table 2 as wel I as othe... tables <br />also include data f...om su...ge and compa...ative conventional sites to <br />estimate an ove...all ave...age for the G...and Vall ey. Data f...om <br />compa...ison sites a...e discussed in detail under the section, "Su...ge and <br />conventional irrigation comparison". <br />9 <br />