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<br />-- <br /> <br />vcrbaok areas by the engineer using published information, <br />(Reference 3) coupled with experience of field conditions. For <br />the roughness coefficient of a channel, a calculation using the <br />~thod described in the Appendix can be performed to estimate the <br />11" 1 <br />~!llnnings n va ue. <br /> <br />~:annings roughness coefficients were estimated at each of the <br />,;tudy stream cross sections to ensu-e nroper representation of <br />~oughness. A "n" value Summary Table (Pages 45 through 49) is <br />also included in this report for reference purposes. <br /> <br />Since the photographs depict only representative cross-sections, <br />not every variation in roughness along the streams is shown. <br />However, any significant variation in the Mannings "n" value not <br />shown in this report will be included in the hydraulic analysis <br />of the related Flood Hazard and Information Report for Otero <br />County, Colorado. <br /> <br />BRIDGE HAND CALCULATIONS <br /> <br />Also included in the Appendix are hand calculations at all the <br />bridges included in the study. These calculations were a check <br />on the Hec-2 computer calculations for pressure, weir, and low <br />flood conditions at the bridges. A variety of flow equations <br />were used in thi1? process because each bridee had unique flow <br />....... characteristics. A percent difference of 10% between the Hec-2 <br />calculations and the hand calculations was considered acceptable <br />for the purposes of t s report. <br />, <br />/ <br />Prepared by: ~ <br /> <br /> <br />JPD: 1 c <br /> <br />-3- <br /> <br />-- <br /> <br />