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t <br />TABLE 5 <br />COLORADO RIVER CROSS - SECTION SELECTION <br />1 <br />38700, 42900 <br />DETAILED STUDY <br />COE STUDY <br />(Cl & C2) <br />AVAILABLE <br />2 <br />38700, 42900 (C2) <br />DETAILED STUDY <br />COE STUDY <br />AVAILABLE <br />3 <br />C2 - C6 <br />DETAILED STUDY <br />COE STUDY <br />AVAILABLE <br />4 <br />41054, 45791 (C6) <br />DETAILED STUDY <br />COE STUDY <br />AVAILABLE <br />5 <br />44400, 49300 (C6 -C8) <br />CANYON REACH <br />N/A <br />6 <br />44400, 49300 (C8) <br />A -A' FIELD <br />CALCULATED <br />SURVEYED <br />7 <br />44400, 49300 (C8) <br />CANYON REACH <br />N/A <br />8 <br />45098, 50030 (C9) <br />DETAILED STUDY <br />FEMA STUDY <br />AVAILABLE <br />9 <br />71619, 80289 (C9 - C11) <br />DETAILED STUDY <br />FEMA STUDY <br />AVAILABLE <br />10 <br />73340, 82262 (C12) <br />CANYON REACH <br />N/A <br />11 <br />74565, 83668 (C13) <br />B -B' MAP <br />CALCULATED <br />DERIVED <br />12 <br />74565, 83668 (C13) <br />C -C' MAP <br />CALCULATED <br />DERIVED <br />* Reach 12 is a "Canyon" reach, but a map- derived cross - section was used there anyway. <br />4.4 Comnutine Flood Depths <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 />OR <br />