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<br />6. Loss of agriculturalproductton because of poor drainage. <br /> <br />7. Lo'ss. of water from large areas covered with phreatophytes; <br />also, reduction in channel and floodway capacity where <br />these growths are not controlled. <br /> <br />Problem Area 4, AsA ,1304. <br /> <br />Unless positive steps. are taken to reduce salinity, siltation, <br />and phreatophytic growth along the mainstem of the Pecos River down- <br />stream from Santa Rosa, negative effects will continue in the form of: <br /> <br />1. Surface-water supplies cannot be used for most municipal <br />and industrial purposes without expensive treatment. When <br />used for agricultural purposes, considerable water is required <br />to leach salts below the root zone. In some areas, it is also <br />necessary to add sulphuric acid to the water and gypsum to the <br />soil to maintain a reasonable salt balance. <br /> <br />2. Surface-water quality exceeds the tolerance of some vegetable <br />and fruit crops. Failure to obtain satisfactory stands during <br />germination frequently reduces yields of semitolerant crops <br />such as cotton and wheat. <br /> <br />3. Continued siltation of stream channels and reservoir areas. <br /> <br />4. Loss of water from large areas covered with phreatophytes; <br />also, reduction in channel and floodway capacity where these <br />growths are not controlled. <br /> <br />Problem Area 5, ASA's 1302 and l304. <br /> <br />The problem of diminishing ground-water supplies resulting from <br />ground-water mining in irrigated areas will have these negative effects. <br /> <br />1. Loss in food and fiber production as the ground-water supplies <br />diminish. <br /> <br />2. Social and economic impacts resulting from loss of income <br />which will occur as these lands change from irrigated to <br />dry cropland uses. <br /> <br />TEXAS <br /> <br />The broad implication of not solving severe water and related problems <br />is directly related to the need to plan for the solution and prevention of <br />water problems. )In this regard, there are two compelling reasons for <br />developing plans to solve water resource problems: (1) the quantity of <br />water necessary to meet Texas' large and growing need is not available <br />from ground-water aquifers and undeveloped flowing streams; and (2) the <br />time required to find, develop, and deliver additional quantities of suitable <br />quality water exceeds the length of time that the people and the economy of <br />Texas can survive a water supply interrupting drought. <br /> <br />76 <br /> <br />0031.>1 <br />