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6. The pond must be "inspected during construction under the supervisi <br />end certified after construction by, a qualified registered prufesslonal <br />engineer. Certification of the constructed pond shall be for~erded tort <br />Division Immediately following construction "(Rule 4.05.6(7). <br />7, No design s, were provided forlthe proposed east or west drainage cha <br />diversions. I have made a rough estimate of the drainage area length an <br />change in elevation for the west channel from a USGS topo map. This sho <br />acceptable, however, the operator should compare the channel design to t <br />existing channel. <br />L 1730' <br />Z 7730-7360 = 370' <br />S • 21.4% <br />A=15 acres ~ <br />10 yr. - 24 hr, rainfall = 2,1" <br />CN 73 <br />Runoff 0.37" ~ <br />Slope length 209(A)•6 I <br />A ^ 33.87 <br />Slope Ad,)ustment 1.04 , <br />Q peak = 21 CFS/in x 0.37" x 1.04 x 15/33.87 • 3.58 CFS <br />Design a channel to handle these flows. <br />• L = 520' N 0.03 <br />Z = 60' <br />S 11.5% K' = QN/b8/3 S1/2 D/b = .125 <br />Q = 3.58 CFS K' 0.05 D ,25 <br />Y•Q/A•5.7FPS <br />r, <br />i ;, .l , <br />~i <br />~'il~~,~ <br />.• <br />4 ~ <br />~•~ 1V~+~ <br />of, ~~ ~: <br />'i <br />be <br />The same channel design used for the channel into the sediment pond can be <br />used for this channel. <br />The east channel will carry less flow than the west channel since the wes <br />channel will be used to divert the stream channel. For simplicity, it would <br />probably be easiest ,)ust to build the east channel to the same design as the <br />west channel and pond channel. <br />8. The drainage control map shows the east channel crossing an access road. <br />Now will this be accomplished? If possible, the channel could run along the <br />road to the meadow. If this is not possible then a Swale could be constructed <br />in the road since flows in this channel will be low. <br />/v~ r <br />7960E i <br />iL. J <br /> <br />