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<br />TABLE 18-6 FLOW RATING CHART <br />SWGS - 06 COAL CREEK CULVERTS <br />SLOPE -6.50-(-7.77) 0.0416 <br />30.5 <br />Based upon Mannino Formula <br />• <br />DEPT °(inchBS)~ L'OVtt . cfs} ~,D nc~~ cfs) <br />1 0.69 14 162 <br />2 3.04 16 206 <br />3 7.19 18 253 <br />4 13.2 20 301 <br />5 21.0 22 349 <br />6 30.5 24 396 <br />7 41.8 - 26 441 <br />8 54.8 28 480 <br />9 69.2 30 513 <br />10 85.2 32 536 <br />11 103 34 544 <br />12 121 36 506 <br />The rating chart shown above is for equal flow in the six culverts. <br />The depth of flow in each of the six culverts will be measured for both <br />instantaneous and peak flow. Flows will be calculated from the <br />average depth. <br />:~ <br />VOL 5 TAB 18 <br />TABLE 18-6 <br />7-7-99 <br />