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<br />6 is chosen as the smaller value from the two criteria. the values chosen by the <br />program for 6X and 6t are printed in the output, along with the computed peak flow. <br />Before the hydrograph is used in subsequent operations, or printed in the hydrograph <br />tables, it is converted back to the user-specified computation interval. the user should <br />always check to see if the interpolation back to the user-specified computation interval <br />has reduced the peak flow significantly. If the peak flow computed from the internal <br />computation interval is markedly greater than the hydrograph interpolated back to the <br />user-specified computation interval, the user-specified computation interval should be <br />reduced and the model should be executed again. <br /> <br />6.3. DATA REQUIREMENTS. Data for the Muskingum-Cunge method consist of the <br />following: <br /> <br />1. Representative channel cross section. <br /> <br />2. Reach length, L. <br /> <br />3. Manning roughness coefficients, n (for main channel and overbanks). <br /> <br />4. Channel bed slope, S . <br />o <br /> <br />In the HEC-1 model the method can be used with a simple cross section (i.e. <br />trapezoid, rectangle, square, triangle, or circular pipe), or a more detailed 8-point cross <br />section can be provided. <br /> <br />SUGGESTED FURTHER READING <br /> <br />U.S. Army Corps of Engineers, 1960. "Routing of Floods Through River Channels", <br />EM1110-2-1480. <br /> <br />U.S. Army Corps of Engineers, 1990. "River Routing With HEC-1 and HEC-2" Training <br />Document No. 30 Hydrologic Engineering Center, Davis, California. <br /> <br />U.S. Army Corps of Engineers, 1980. "Comparative Analysis of Flood Routing <br />Methods", <br />Research Document No. 24, Hydrologic Engineering Center, Davis, California. <br /> <br />U.S. Army Corps of Engineers, 1991. "A Muskingum-Cunge Channel Flow Routing <br />Method for Drainage Networks." Technical Paper No. 135, Hydrologic Engineering <br />Center, Davis, California. <br /> <br />Linsley, R.K.; Kohler, M.A.; and Paulus, J.L., 1975. "Hydrology for Engineers," <br /> <br />7-54 <br />