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<br />Advantaaes <br /> <br />Disadvantaaes <br /> <br />1, Provides means for extending <br />historical stream gaging period, <br /> <br />1, Is an inferential method, <br /> <br />2, Provides guidance on shape of <br />frequency curve beyond range of <br />measured data, <br /> <br />2, Not applicable to 911 drainage basin <br />morphology, <br /> <br />6.3 Selection of HydrologIc Approach" The particular method used for thll solution to <br />II hydrologic problem is a function of: <br /> <br />(1) Required product of the analysis <br /> <br />(2) Required level of accuracy <br /> <br />(3) Data availability <br /> <br />(4) Resources <br /> <br />9,3,1 Reauired Product of the Analvsis, The most critical element in determining which <br />/1ydrologic method is the most i1Ppropriate for a given problem is determining what <br />/1ydrologic characteristic is required to properly analyze the problem, For example, for a <br />simple sewer design, the peak discharge is all that is required, For sizing of a reservoir, <br />though, a complete inflow design hydrograph is required. The method of solution, <br />consequently, is somewhat dictated by what is required to solve the problem, <br /> <br />9-3.2 Reauired Level of AccuracY. The required level of accuracy in solving a given <br />hydrologic problem is also an important consideration in selecting w/1at hydrologic method <br />to use, The required level of accuracy is usually dependent on the scale or complexity of <br />the problem being solved, Designing a simple highway culvert is obviously going to entail <br />less detail than designing a large, high hazard dam, Table 6,1 shows genllral design <br />criteria for various water-control structures,(Chow, 1988), <br /> <br />Colorado Flood <br />Hydrology Manual <br /> <br />6.5 <br /> <br />aw=r <br />