|
<br />Advantages
<br />
<br />DisaQ,yantillWJ,
<br />
<br />1, Provides means for extending historical
<br />stream gaging period,
<br />
<br />1, Is an infmential 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 />3, Requires specialized training,
<br />
<br />3, Indicates probable upper limits of the
<br />largest floods that have occurred in river
<br />basins,
<br />
<br />4, Channel changes (scour/deposition)
<br />over time may significantly affect
<br />discharg" estimates, Generally, limited to
<br />stable boundary conditions, Le, bedrock
<br />channels,
<br />
<br />4, Provides supplemental information on
<br />the age, magnitude, frequency, and spatial
<br />occurrence of floods,
<br />
<br />5, Assumes climatic stationarity over very
<br />long time p'eriods, i,e, since glaciation,
<br />
<br />5, Provides information about flood!; in
<br />ungaged basins,
<br />
<br />6.3 Selection of Hydrologic Approach, The particular method used for the solution to a hydrologic
<br />problem is a function of:
<br />
<br />(1) Required product of the analysis
<br />
<br />(2) Required level of aCCLJracy
<br />
<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 hydrologic
<br />method is the most appropriate for a given problem is determining what hydrologic characteristic is
<br />required to properly analyze the problem, For example, for a simple sewer design, the peak discharge
<br />is all that is required, For sizing of a reservoir, though, a complete inflow design hydro graph is
<br />required. The method of solution, consequently, is somewhat dictated by what is required to solve the
<br />problem,
<br />
<br />6,3,2 Required Level of Accuracy, The required level 01 accuracy in solving a given hydrologic
<br />
<br />Colorado Flood
<br />Hydrology Manual
<br />
<br />6.6
<br />
<br />DRAFT
<br />
|