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<br />. <br /> <br />~ SPECIAL STUDIES (Continued) <br />CD <br />w::. <br />Q five other stations and the selected frequencies are shown in the <br />following tabulation: <br /> <br />Colorado River below Parker Dam <br />CRIR Levee Drain near Parker <br />CRIR Lower Main Drain near Parker <br />Palo Verde Outfall Drain near Palo Verde <br />Colorado River at Imperial Dam <br /> <br />Samples/Week <br />1 <br />1 <br />1 <br />1 <br />7 <br /> <br />Data from the Intensive Salinity Surveillance Program have been <br />valuable in analyzing salt loads from the Palo Verde Irrigation District <br />and the Colorado River Indian Reservation for the Water Quality Improve- <br />ment Program, part of the Colorado River Basin Salinity Control <br />Project - Title II. <br /> <br />G. Irrigated Areas <br /> <br />Studies have been made in several areas to determine irrigation <br />effects on water quality. <br /> <br />1. Prediction of Mineral Quality of Irrigation Return Flow <br /> <br />. <br /> <br />A cooperative study initiated in 1969 entitled "Predictions of <br />Mineral Quality of Irrigation Return Flows" was conducted by the Bureau <br />of Reclamation and Environmental Protection Agency to develop a tech- <br />nique for predicting the mineral quality of irrigation return flow. The <br />means for accomplishing this is through the use of mathematical models <br />and high speed computers. The mathematical model is primarily a mathe- <br />matical formula or expression attempting to describe conditions en- <br />countered on an irrigation project. The study utilizes data from exist- <br />ing irrigation projects in order to verify the technique. <br /> <br />The objective of the study was to use the model as a tool in pre- <br />dicting changes in capacity and the associated water quality distribu- <br />tion of the aquifer and also the quality distribution of the water as <br />surface effluents from the system. The prediction of the system <br />responses was compared with the historical data, both quantity and <br />qualify distributions as a measure of the reliability of the model. <br />Data from the Vernal Unit of the Central Utah Project have been used for <br />designing and testing the model. Tests were also made using data from <br />the Grand Valley area in Colorado and the Cedar Bluff Unit in Kansas. <br /> <br />A detailed return flow quality model was also developed under <br />contract with the University of, Arizona, and by the Bureau of <br />Reclamation personnel over a period of about 5 years. This model pro- <br />vides a highly sophisticated and detailed simulation of salt and <br />nutrient movement from the soil surface to a tile or open channel <br /> <br />. <br /> <br />121 <br />