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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />details of these equations refer to the Guidelines for Determining lOO-year Flood Flows for <br />Approximate Floodplains in Colorado (eWes. 1999). <br /> <br />HEC-RAS. the Army Corp of Engineers Hydrologic Engineering Center's River Analysis <br />Systems. is the computational program 10 be used for the delineations of the river basin. This <br />program is capable of one-dimensional steady now water surface profile calculations. <br />simulations of unsteady flow and sediment transport computations. The basis for these <br />calculations is the solution of the one dimensional energy equation. For rapidly varied surface <br />water now, the momentum equation is utilized. <br /> <br />14 <br />