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<br />o <br />(-:--, <br />.... <br />W <br /><.0 <br />t-'" <br /> <br />. <br /> <br />-. <br /> <br />" <br /> <br />obtained as a result of data collection, research, and hydrologiC <br />studies. A great deal of time and money is spent in arriving at the <br />factors and unless such factors are uniform or derived under common <br />criteria, hydrologic coordination cannot be achieved. Consequently, <br />a great deal of time and money can be saved and closer coordination <br />can be achieved by taking advantage of all available data and work in <br />connection with these factors and thus arriving at commonly acceptable <br />results. Although the factors being derived and utilized are basically <br />of a local n&ture and susceptible of solution at that level, essen- <br />tially the same over~ll policy and administrative cOIlUllents can be <br />made for this item as are IIIl.de for item d. <br /> <br />f. Develop uniform or commonly acceptable hydrologic procedures <br />including frequency an&lysis, flood and vater resource determinations, <br />flood routing, reservoir regulation and other hydrologic analyses where <br />differing approaches could affect the comprehensive development of the <br />watershed. <br /> <br />Procedures for making hydrologiC calculations such as included in <br />this item are developed on the basis of experience, research, and ad- <br />vancements in the science of hydrology and each organization has <br />developed its own methods over a period of years. In general, the <br />discussion included under item d is applicable to this item. <br /> <br />g. Adopt uniform approach to hydrologic criteria for planning and <br />design such as storage allocation for flood control, spillway design, <br />and safety factors. <br /> <br />The factors here considered are, to a <br />by decisions IIIl.de at the Washington level. <br />item d also apply here. <br /> <br />certain extent, determined <br />Thus, the discussions under <br /> <br />h. Reach a common understanding on and take account of the effects <br />of all water use and control measures. <br /> <br />In order to plan and design structures and programs for the <br />1IIl.x1mum efficiency in terms of benefits from the ex.penditures made, <br />it is necessary to assume a set of conditions for a reasonable period <br />of years into the future. The effects of various projects and programs <br />which are hydrologically interrelated is an important part of this <br />consideration since the effects of existing as well as anticipated <br />projects and programs IllUBt be taken into account. Thus, historic <br />recorda of past experiences of streamflovs or other data can be used <br />for dependable predictions of future conditions only as they are <br />modified by anticipating changes resulting from present and/or related <br />projects and programs. For example, a project designed to utilize a <br />certain quantity of water derived on the basis of historic record will <br />not realize the anticipated benefits if another project i8 constructed <br />to utilize all or part of the same water. Likewise, a project <br /> <br />C/l-5 <br />