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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 /> <br />2 <br /> <br />3 <br /> <br />4 <br /> <br />5 <br />6 <br /> <br />7 <br />8 <br /> <br />9 <br /> <br />10 <br />11 <br /> <br />12 <br /> <br />TABLE 5 <br />COLORADO RIVER CROSS-SECTION SELECTION <br /> <br />.... ___....._,..".d ......._ ......, .____ ..... <br />.............................................................. <br />.......................-..................................... <br />.............................................................. <br />............................................................. <br />........ ............,........................................ <br />."'.El'iliOW"'vAtUES'(CF5)"""",...., <br />tlll'.._I,.1 <br /> <br /> <br />38700, 42900 DETAILED STUDY COESTUDY <br />(Cl & C2) AVAILABLE <br />38700, 42900 (C2) DETAILED STUDY COESTUDY <br /> AVAILABLE <br />C2 - C6 DETAILED STUDY COE STUDY <br /> AVAILABLE <br />41054, 45791 (C6) DETAILED STUDY COE STUDY <br /> AVAILABLE <br />44400, 49300 (C6 -C8) CANYON REACH N/A <br />44400, 49300 (C8) A-A' FIELD CALCULATED <br /> SURVEYED <br />44400, 49300 (C8) CANYON REACH N/A <br />45098, 50030 (C9) DETAILED STUDY FEMA STUDY <br /> A V AILABLE <br />71619, 80289 (C9 - CI1) DETAILED STUDY FEMA STUDY <br /> AVAILABLE <br />73340, 82262 (C12) CANYON REACH N/A <br />74565,83668 (C13) B-B' MAP CALCULATED <br /> DERIVED <br />74565, 83668 (C13) C-C' MAP CALCULATED <br /> DERIVED * <br /> <br />* Reach 12 is a "Canyon" reach, but a map-derived cross-section was used there anyway. <br /> <br />4.4 Computing Flood Depths <br /> <br />Flood depths were calculated at each cross-section through a computer program (QANY) which <br />uses Manning's equation. The input parameters for the calculation of flow included: x and y <br />coordinates for points on the cross-section, Manning's 'n' values (Reference 11), the channel <br />slope (interpreted from USGS quadrangle maps), and depth values. The program calculated flow <br />and velocity values for each depth value entered. The target flow values were those values <br />established in Section 3.0 and shown on Table 3. Rating curves were established from the <br />calculated depths. From the rating curves 50-year and 100-year flood elevations were <br />established at each location. <br /> <br />18 <br />