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<br />CHAPTER. 5 <br />POLICY AND DECISION ELEMENTS <br /> <br />5,0 Introduction <br />The development of a hydrologic model for a draina.ge basin requires a number of input variables <br />and criteria, Consistency in the application of a model can be achieved with the establishment <br />of statewide and regional guidelines. This chapter provides state policies and guidelines <br />necessary to perform a comprehensive analysis of a basin under study, Regionalization of criteria <br />is a means of establishing guidelines/assumptions for many of Colorado's basins, streams, <br />weather patterns, and topographic characteristics where there is a disparity of real-time data, <br />Policy on detention and diversion effects are needed for many basins because of the changes to <br />the natural drainageways, Guidelines are presented in this chapter which indicate a consensus <br />of the Flood Hydrology Advisory Committee, a panel of experts representing Federal, State, and <br />local government, and engineering consultants, with a high level of knowledge and e)(perience <br />in Colorado flow regimes. Guidance is provided for the following "Decision Elements"; <br /> <br />A Basin and Stream Characteristics <br />B, Flood Control Detention Storage Facilities <br /> 1) Allocated Detention Storage Facilities <br /> 2) Incidental Flood Control Storage <br /> 3) Incidental Detention Storage Facilities <br />C. Effects of Irrigation Canals and Ditches <br />D, Non-Tributary Areas <br />E, Storm Patterns and Distribution <br />F. Methods <br /> 1) Statistical Analysis <br /> a, Historic EventslHigh Outliers <br /> b. Skew Coefficients ~ <br /> c. Expected Probability <br /> 2) Regional Regression Equations/Cur;es <br /> 3) Rainfall Runoff Models <br /> <br />1 <br />