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<br />. <br /> <br />. <br /> <br />e. Establish uniform hydrol9t>:Jc factors for: the watershed, such as <br />infiltration indi~-L-~imes OLr'mOrr conc8nLration, travel times, <br />channel losses l transportation 10"""3, Clnd ':,vnpora.tion. <br /> <br />The factors in this item are all important to the planning <br />and design of water use and control structures and progr'ams'. They are <br />obtained as a result of data collection, research, and hydrologic <br />stucies, 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, hydrolo~ic coordination Cilllnot 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 am. utili.zed are basically <br />of a local n"ture and susceptible of solution at that level, essentidly <br />the same over-all policy and administrative cOmmBnts can be made for <br />this item as are made for item d. <br /> <br />f. Develop uniform or commonly acce9table hydrolozic procedures in- <br />cludin~ frequency ~.nalysis, flood, and water r'~SOllrce dgterminations, <br />flood routing, res,rvoir regulation and oth"r hydrylo",ic am,l:yses <br />~JOe differin" apnroaches could affect the cO'1lprehenslve develop~ <br />of the watershed. <br /> <br />Procedures for makin;: hydrologi c calculations such as included <br />in this item are d8veloped on the b,;sis of ,"xp~rienc8, research, and <br />advanc8ments in the science of h;l'drolo~y and '''8ch 0r~"nization has <br />developed its own methods over n perIod o~ y~,~,t's. In ,~.3n2r&1, the dis- <br />cussion included under item d is armlicab1e to thLs item. <br /> <br />r,. Adopt uniform 8-pproach to hydrolo':ic crit,"rio; for pl,~nning and <br />design such ~s stora~8 allocation for flood control, ~pillwcY design,and <br />saf8ty factors. <br /> <br />Th:l factors h3re considel'ed arc, to a certain extent, deter- <br />mined by decisions marte at the Washington level. Thus, the discussions <br />under item d also opply here. <br /> <br />h. Reach a common understandinr on and take account of the '3ffects of <br />all W,'j, ter l~fje a.nd. control m9ClSl.1res. <br /> <br />In order to plan and design structures and programs for the <br />maximum efficiency in terms of benefits from the expenditures made, it <br />is necessary to assume a set of condItions for a reasonable ~,"riod of <br />years into the future. The effects of vnrious projects anrl programs <br />which are hydrolo7,ically interrela.ted is an important p-crt of this con- <br />sideration since the effects of existing as well as anticipatod proj- <br />ects and programs must b~ taken into account, Thus, historic records <br />of nest exn2riences of str2,>mflows or other dctu can be used for de- <br />pendable nredictions of futl1re condi tions only us they arc modified by <br /> <br />- 5 - <br />