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<br />GRAND MESA COAL COMPANY <br />FLOW CALCULATIONS <br />DITCH 1 DITCH 2 DITCH 3 <br />CHANNEL WIDTH = A 1.000 1.000 3.000 <br />FLOW DEPTH = H 0.750 1.167 1.167 <br />CHANNEL SLOPE = S 0.020 0.025 0.020 <br />ROUGHNESS COEFF = 0.040 0.040 0.040 <br />AREA 1.313 2.528 4.861 <br />WBTTED PERIMETER 3.121 4.300 6.300 <br />HYDRAULIC RADIUS 0.420 0.588 0.772 <br />R".667 0.561 0.702 0.841 <br />VELOCITY 2.956 4.132 4.431 <br />FLOW cfs 3.880 10.446 21.542 <br />TABLE 2.05.3(41(d1-6 <br />DITCH 4 <br />3.000 <br />1.333 <br />0.020 <br />0.040 <br />5.778 <br />6.771 <br />0.853 <br />0.900 <br />4.739 <br />27.380 <br />\ `nL~ <br />~~V " V <br />SEDIMENT POND <br />SPILLWAY <br />SE SECT <br />~~~ 6 <br />1 <br />0.02 0.05 <br />0.04 0.04 <br />11.000 7.000 <br />12.828 8.828 <br />0.857 0.793 <br />0.903 0.857 <br />4.754 7.135 <br />52.299 49.944 <br />.NOTES: <br />1 DITCH NUMBERS REPRESENT THE SECTIONS SHOWN ON <br />DRAWING 2.05.3(4)-2a <br />2 THE SEDIMENT POND SPILLWAY TAPERS FROM 10 FEET WIDE TO <br />6 FEET WIDE WHERE IT CROSSES OVER THE EMBANKMENT <br />AND STARTS DOWN THE OUTSLOPE OF THE FILL <br />3 THE PEAK FLOW FOR THE SPILLWAY DESIGN IS 36.53 cfs <br />4 THE FLOW CALCULATIONS SHOWN ARE WHAT THE DICH AS SIZED WILL <br />HANDLE WHICH IS IN ALL CASES GREATER THAN THE PEAK FLOW <br />CALCULATION FOR THE DITCH <br />ENGINEERING CERTIFICATION <br />I hereby certify that the calculations presented on this table were <br />performed by me during July 1988 and are true and correct to the beat <br />of my knowledge and belleP. _~,pq ,~P4o <br />~ n ~o P.EYG~i9?30 <br />i <br />o ~ ~ <br />d'Q c T // G4tg . hi' ~ <br />~c.OQ. ao r° ...~ <br />O °o " .`:: <br />c o.,.. ^f+.. <br />1 <br />L- J <br />