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<br />I - 2U <br /> <br />on a national anrJ international basis. Throul)h an appropriate exchan'Je of <br />information between scientists working in these fielrJs, opportunities to do a beU.er <br />job with all aspects of river development should be greatly enhanced. <br /> <br />I. 5. 3 Data Requirement <br />I_arge amounts of data pertaining to understandin') the behavior of rivers have <br />been acquired over a Ion') period of time. Nevertheless, data collection efforts to <br />date have been sporadic and unfocuwd. A')encies should tab, a careful look at <br />present data requirements needed to solve practical problems "long with existing <br />data. A careful an"lysis of data rQquirements would make it possible to more <br />efficiently utilize funds to collect data in the future. The basic type of informaUon <br />that is required includes: water dischar')e hydrograph, sediment discharge <br />hydrograph, the characteristics of thl) sediments being transportQd by streams, the <br />characteristics of the channels in whit:h the water and sediment are transported, and <br />the characteristics of watersheds and how they deliver water and sediment to the <br />stream systems. Environmental data is also needed so that proper assessment can <br />be made ()f the impact of river development upon the environment and vice versa. <br />The problem of dat_a requirements at river crossings is of sufficient importance that <br />it is treated in greater detail in Chapter VI. <br /> <br />I <br />J <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />.- <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />-- <br />I <br />