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<br />r- <br /> <br />.~ .... <br /> <br />..~<1 economy resulting from project implementation. Monitoring of economic <br /> <br />...-I <br /> <br />, <br />0.-' <br /> <br />!:.~~ <br /> <br />impacts will be correlated with monitoring of irrigation and wildlife. <br /> <br />Basin-Wide Salinity <br /> <br />In addition to recognition of the activities of other agencies, USDA is an <br /> <br />active participant on interagency coordinating committees and other groups <br /> <br />where water quality sampling strategies are discussed and dat.a analyzed. <br /> <br />USGS maintains a network of stations on the main stem and tributaries of the <br /> <br />Colorado River. In addition, USGS and USBR monitor approxima.tely 100 "local" <br /> <br />stations. At the recommended level, some funds will be transferred t.o ot.her <br /> <br />agencies to maintain the existing monitoring network, and for special data <br /> <br />analysis of particular interest to USDA. <br /> <br />Analytical Analysis <br /> <br />A t the end of the irrigation season, water budgets for each irrigation event <br /> <br />will be summarized. The accumulation of irrigation events will become the <br /> <br />annual water budget. Existing hydrologic and quality models may be used, <br /> <br />such as those developed by SCS, BR, and CSU. The volume of r.~uction in deep <br /> <br />percolation due to farm improvements will be computed. The volume of <br /> <br />reduction in seepage due to ditch and lateral lining or installation of pipe <br /> <br />will be computed. Estimates of deep percolation and seepage reductions will <br /> <br />be translated into salt load reductions. Each acre-foot of dE!ep percolating <br /> <br />water picks up one to ten tons of salt while it is in transit. back to the <br /> <br />river system, the amount depending on which subarea is being evaluated. <br /> <br />Changes in water use by crops (short supply areas) and phreat.ophytes <br /> <br />(wetlands) will be determined to calculate the downstream effect on salt. <br /> <br />concentration. An annual progress report sunnnarizing results will bE! <br /> <br />prepared, and the direction of the moni toring evaluated and redirected as <br /> <br />4 <br />