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<br />. <br />:. <br />. <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />. <br />I <br /> <br />J(53 <br /> <br />Plateau Creek added 59,000 tons of salt per year to the <br />Colorado River. Although an accurate salt budget for this <br />drainage was not developed, salt load contribution by irrigation <br />was estimated at 27,000 tons per year. <br /> <br />The EPA study attributed 751,900 tons per year of the total <br />subbasin salt yield to man caused sources. Natural sources were <br />identified as contributing 32,800 tons per year. <br /> <br />Bureau of Reclamation - Stage One Development Grand valley <br />unit Special Report, September 1979 <br /> <br />This report presents the results of definite plan studies on <br />the proposed Stage One Development of the Grand Valley Unit of <br />the Colorado River Basin Salinity Control project. The unit is <br />designed to reduce the salt contribution to the river from <br />irrigated lands in the Grand Valley, from below Cameo to just <br />below Mack, excluding the Gunnison River and Plateau Creek. <br /> <br />In order to more clearly characterize salt loading from <br />irrigated agriculture in the Grand Valley, the Bureau measured <br />stream and groundwater flows and quality from 1974 through 1976. <br />The annual salt contributions from irrigation are shown below. <br /> <br />Source <br /> <br />Tons per year <br /> <br />Canal Seepage <br />Lateral Seepage <br />On-Farm Ditch Seepage <br />Deep PerCOlation From Irrigation <br />s~rface Runoff From Above Irrigated Lands <br />TOTAL <br /> <br />240,000 <br />230,000 <br />160,000 <br />140,000 <br />10,000 <br />780,000 <br /> <br />-21- <br />