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~") L"'J ,:; ~ 10 ~~-, '.. Major Elements of the Survey More reliable data and analysis' of many aspects of salt loading from irrigated areas and diffused land sources are needed before ~lll impacts of alternative improvement programs can be adequately detennined. How- ever, there are many improvement practices which will enhance overall water quality including salinity reduction in any regard which should be implemented in the Grand Valley. Major elements of the survey include developing water and salt budgets, determination of irrigation system and management alternative impl'ove- ment needs, treatment opportunities in diffuse source upland dra:i,nage, costs and impacts of alternative treatment practices and an implementa- tion program. Water Budget - An overview of the inflow-outflow water pattern fe-I' the Grand Valley area and for each irrigation system, Present and improved irrigation system alternatives will be evaluated. Components to be determined include diversions, canal seepage and spill, farm delivery, crop consumptive use, surface and subsurface return flow, and incidental consumptive losses. Salt Budget - Develop an overall inflow-outflow salt distribution pattern by geohydrologic segments, including the diffuse source areas and irrigated areas of the Grand Valley. Water quality analysis win be used to evaluate the diversion inflow, and the surface and the subsurface outflow. The interrelationship of surface water distribution and on-,f6,rm irrigation efficiency for present and future conditions as they relate to salt load pickup will be identified. Irrigation System an't Water Management Improvement Nee,!&.. ,. Jnvent,,,.y Lb present on-farm systems and efficiency of water use field-by-f'i d,<I. Using accepted and proven technology, determine gravity in'iglj,tI,/, system improvement opportunities and needs. Also explore opi: l.unities for pressure systems or other new technology, such as sprinLLu, bubbler, or drip irrigation systems which would greatly reduce deep pb'colation return :flow. Using the ef:ficiency obtainable in irrigation guides for improved systems, calculate on-farm efficiencies using three alternative levels of water management. The study of on-farm systems and management. opport.unities will provide information for use in (1) water budget.s, (2) salt budgets, (3) determining alt.ernat.ive program need", and (4) cost and ret.urn evaluations. Diffuse Source Area Problems - Evaluate t.he contribution of sa},t, sedi- ment., and water into and t.hrough the irrigat.ed area from t.he upland water- shed (diffuse area.) Determine treat.ment. opport.unities and needs to reduce salt and sediment inflow to the Colorado River.