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<br />l'\) <br />f'') <br />co <br />f\:. <br /> <br />Irrigation monitoring sites were established to represent the general <br />conditions in the Grand Valley with regard to crops, soils, irrigation <br />system, and management practices. criteria established for site <br />selection include that sites be isolated from other fields, i.e., water <br />source for inflow must be independent and tailwater from outflow must be <br />isolated so that water from other sources does not get mixed. A <br />monitoring site is defined as a single field or a fixed portion of a <br />field, that is irrigated as a single irrigation set or a series of sets. <br />A site has a fixed size throughout the irrigation season. <br /> <br />1995 Irrigation Monitoring: In 1995, eight irrigation monitoring sites <br />were established in eight different fields. Four of the fields had <br />improved irrigation systems and four did not. <br /> <br />For each site monitored in 1995, information on soil type, texture and, <br />intake rate, slope, field size, length of run, and irrigation systems is <br />provided in the individual site summary data sheet available upon <br />request from NRCS. Figure 1 shows the location of the 1995 irrigation <br />monitoring and evaluation sites. <br /> <br />All of the eight irrigation sites monitored in 1995 were surface <br />irrigation systems. The irrigation system at each site is identified in <br />Table 2. Automated electronic flow recorders were installed at each <br />field to measure the volume of inflow and outflow. These flow recorders <br />were connected to electronic data recorders. The recorders measured <br />inflow and outflow every 10 or 30 minutes. <br /> <br />Two radio telemetry weather stations located on the east and west ends <br />of the Grand Valley measured the climatic parameters needed to calculate <br />potential evapotranspiration (ETp). These data were stored in the <br />computer for later use. Electonic data recorders were installed at the <br />weather stations and the data pack recorders retrieved weekly. <br /> <br />Crop consumptive use for each crop was determined using the Modified <br />Penman equation developed by Agricultural Research Service (ARS) , Fort <br />Collins, Colorado. The crop coefficient curves for ET calculations were <br />developed jointly by NRCS, ARS and CSU Cooperative" Extension personnel <br />located in Grand Junction. <br /> <br />Summary Of stream Gauging Data <br /> <br />No stream gauging data was collected by the NRCS. The u.s. Geological <br />Survey (USGS) is responsible for collecting stream data. In future <br />annual reports, USGS data for flows and TDS will be provided. USGS <br />stations are located at Cameo, CO and cisco, UT(see appendix B) . <br /> <br />5 <br />