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<br />o <br />r," .,' <br />.... <br />w <br />c.o <br />N <br /> <br />designed to control a certain magnitude of flood will not be fuJ.ly <br />utilized if a fUture upstream project reduces the anticipated flood, <br />or if a downstream project is constructed to protect an area which <br />already received protection from an upstream project. This item <br />occasioned considerable controversy during the course of the AWR studies <br />and special efforts were IlBde to arrive at solutions thereto. Satis- <br />factory accomplishment of this item can be achieved only after other <br />basic hydrologiC problems have been resolved. <br /> <br />1. Establish a uniform approach to the analysis, effect, and control. <br />of sedimentation. <br /> <br />The problems of sed1meptation p~y a vital role in the comprehensive <br />planning for a wv.tel1lhed;. Tl;ie CI.lltr11ilente.l effects ot. sedimen'l;e.tion range <br />from the washing avay of topsoil from the wv.tersheds to the forming ot <br />tidal deltas at the mouths of IlBjor tributaries. The problems include <br />the silting up of reservoirs, destruction of fertile farm lands by deposits <br />of sand and gravel during floods, deterioration of stream channels and <br />llBintenance problems on navigation projects. Methods of sediment analysis <br />and control vary widely among the IlBny agencies and interests concerned <br />with the problems resulting in little coordinated action among them, al- <br />though most ot the uncoordinated actions probably react to the cOIlUllOn good. <br />It is believed that through coordination, expenditures now being IlBde on <br />this problem would result in greater benefit. <br /> <br />j. Establish a uniform approach to the analysis, effect, and control of <br />the chemical and physical qualities of water. <br /> <br />Water quality in IlBny areas is being impaired through discharge of <br />industrial and domestic wastes and as a result of unwise land use, as well <br />as from natural causes. These conditions result in increased dissolved <br />mineral or bio-chemical content or changed physical properties which are <br />all recognized as pollution. Agencies whose programs relate to vater and <br />land use recognize the desirability of maintaining and improving, where <br />possible, the natural quality of streamflow and ground water. However, <br />in some areas there is not sufficient authority or a reluctance to exer- <br />cise that authority for economic reasons. It should be recognized that <br />. it IlBY not be economically feasible or desirable after using water indus- <br />trially or for MUnicipal or irrigation purposes to restore the effluent <br />waters to their pre-diversion quality. <br /> <br />, <br /> <br />Much water quality data are collected nation-wide along with other <br />streamflow data by the U. S. Geological Survey. Other miscellaneous <br />organizations also have gathered information concerning the quality and <br />other sanitary characteristics of water. Some of these latter data are <br />in pUQUshed form and others have not been.. There is need for compiling <br />all data into usable form as well as for an expanded collection program. <br />More attention is needed regarding minimum flows and their frequency in <br />the pollution abatement problem. Where organic pollution is of concern, <br /> <br />C/1-6 <br />