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<br />Creek, Devils Gulch, Bobcat Gulch, Dry Gulch, Noel's Draw, Dickson <br />Gulch, and Miller Fork. Bridges and culverts were measured to <br />determine size and structural geometry. <br /> <br />Roughness coefficients (Manning's "n") were estimated by field <br />inspection. Channel values ranged from 0.035 to 0.045, and <br />overbank values ranged from 0.050 to 0.060. <br /> <br />Water-surface elevations were computed using the COE HEC-2 computer <br />program (Reference 22). Water-surface profiles for the lower <br />portion of the Big Thompson River (near Loveland) were provided by <br />the COE in their Flood Plain Information report of December 1971 <br />(Reference 13). These elevations were modified by hand calculations <br />where channel modifications and new construction required it. <br /> <br />Cross sections for Buckhorn Creek and Redstone Creek were taken <br />from topographic maps at a scale of 1:2,400, with a contour <br />interval of 2 feet (Reference 23). Bridges were measured to <br />determine size and structural geometry. Roughness coefficients <br />were estimated by field inspection. The channel value for both <br />streams was 0.035, and the overbank values ranged from 0.045 to <br />0.100. Water-surface elevations were computed using the COE HEC-2 <br />computer program (Reference 22). <br /> <br />Cross section data for Boxe1der Creek were taken from topographic <br />maps at a scale of 1:2,400, with a contour interval of 2 feet <br />(Reference 24). Bridges and culverts were measured to obtain <br />elevation data and structural geometry. Roughness coefficients <br />were estimated by field inspection. The channel value used in this <br />report was 0.035, and the overbank values ranged from 0.030 to <br />0.040. Water-surface elevations were computed using the COE HEC-2 <br />computer program (Reference 22). <br /> <br />Cross sections on Dry Creek were taken from topographic maps at a <br />scale of 1:1,200, with a contour interval of 2 feet (Reference 25). <br />Roughness coefficients were estimated by field inspection. Channel <br />values ranged from 0.03 to 0.05, and overbank values ranged from <br />0.015 to 0.10. Water-surface profiles were computed using the COE <br />HEC-2 computer program (Reference 22). <br /> <br />Cross section data for Fish Creek and the Fall River were taken <br />from topographic maps at a scale of 1:1,200, with a contour <br />interval of 2 feet (Reference 26) and were supplemented with field- <br />surveyed cross sections. Roughness coefficients were estimated by <br />field inspection. The channel value was 0.04, and the overbank <br />values ranged from 0.03 to 0.08. Water-surface profiles were <br />computed using the COE HEC-2 computer program (Reference 22). <br /> <br />Cross sections for the Cache La Paudre River were field surveyed by <br />the COE, Omaha District (Reference 6). Roughness coefficients were <br />estimated by field inspection. Channel values ranged from 0.035 to <br />0.045, and overbank values ranged from 0.045 to 0.080. <br /> <br />19 <br />