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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 all drainage basin <br />morphology. <br /> <br />6.3 Selection of Hydrologic Approach. The particular method used for the solution to <br />a hydrologic problem is a function of: <br /> <br />(1) Required product of the analysis <br />(2) Required level of accuracy <br />(3) Data availability <br /> <br />(4) Resources <br /> <br />6.3.1 Reauired Product of the AnalYsis. The most critical element in determining which <br />hydrologic method is the most appropriate for a given problem is determining what <br />hydrologic 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 />6.3.2 Reauired Level of Accuracv. The required level of accuracy in solving a given <br />hydrologic problem is also an important consideration in selecting what 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 general design <br />criteria for various water-control structures.(ehow, 1988). <br /> <br />Colorado Flood <br />Hydrology Manual <br /> <br />6.5 <br /> <br />a=w=r <br />