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<br />Devils Gulch, Bobcat GUlch, Dry Gulch, Noel's Draw, Dickson Gulch, <br />and Miller Pork. Bridges and culverts were measured to determine <br />size and structural geometry. <br /> <br />. <br /> <br />Roughness coefficients (Manning's WnW) were estimated by field <br />inspection. Channel values ranged from 0.035 to 0.045, and overbank <br />values ranged from 0.050 to 0.060. <br /> <br />. <br /> <br />Water-surface elevations were computed using the COE HEC-2 computer <br />program (Reference 22). Water-surface profiles for the lower portion <br />of the Big Thompson River (near Loveland) were provided by the COE <br />in their Flood Plain Information report of December 1971 (Reference 13). <br />These elevations were modified by hand calculations where channel <br />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 interval <br />of 2 feet (Reference 23). Bridges were measured to determine size <br />and structural geometry. Roughness coefficients were estimated by <br />field inspection. The channel value for both streams was 0.035, <br />and the overbank values ranged from 0.045 to 0.100. Water-surface <br />elevations were computed using the COE HEC-2 computer program <br />(Reference 22). <br /> <br />Cross section data for Boxelder 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 eleva- <br />tion data and structural geometry. Roughness coefficients were <br />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 pro~ram (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 />~ <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 interval <br />of 2 feet (Reference 26) and were supplemented with field-surveyed <br />cross sections. Roughness coefficients were estimated by field <br />inspection. The channel value was 0.04, and the ,overbank values <br />ranged from 0.03 to 0.08, Water-surface profiles were computed <br />using the COE HEC-2 computer program (Reference 22). <br /> <br />Cross sections for the Cache La POudre River were field surveyed <br />by the COE, Omaha District (Reference 6). Roughness coefficients <br />were estimated by field inspection. Channel values ranged from <br />0.035 to 0.045, and overbank values ranged from 0.045 to 0.080. <br /> <br />17 <br /> <br />. <br />