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MIDI-CONTINENT RESOURCES, INC. <br /> PRODUCERS OF THE FAMOUS COAL BASIN COKING COAL SPAMW p <br /> BOX 158 AM" ApjW0#8"" <br /> CARBONDALE, COLORADO 81623 AUG <br /> Mlf I C)NTINENTRESOURCES INC <br /> Lt"'-F I E L D ROAD SUITE 220 <br /> ILLINOIS 60521 <br /> C�oHpR�t)o 2 , 1985 "Iff <br /> OF RESOURCES DIEF�,P�"�"T (-)-, NATURAL RES <br /> -'CLAMATION <br /> H F:D L,`1'!0 P-- '= , T <br /> !,I\!- F'J�!I'LDINQ -- <br /> S 1 F, EET <br /> 9 8 <br /> 8 5 <br /> Mr. Mike Ward <br /> To <br /> - <br /> Paonia Ranger District ........................................................ <br /> P. 0. Box 1030 ............ <br /> Paonia, Colorado 81428 <br /> Re : Culvert Sizing Henderson Creek <br /> Dear Mike, <br /> Enclosed is the information you requested on the <br /> culvert sizing of Henderson Creek (Placita and Elk Knob <br /> Quadrangles, R 89W, T 10 S , See 18 , 19 and R. 90 W, T 10 S , <br /> See 24) . <br /> All computations taken from SCS peak flows in <br /> Colorado Technical Release No . 55, March 1984. <br /> Area = 250+ Acres <br /> C.F .S . /inches = 150. (Figure S-1A) <br /> 25 yr/24 hr storm = 2. 211 <br /> Curve No . 70 <br /> Table 2-1 Runoff depth/inches = 0 . 33 <br /> 150 x 0. 33 = 49 . 5 e . f . s . <br /> Thompson Pipe and Steel table for c .m.p. 0.024 n <br /> shows a 48" c .m.p. at . 8% with a discharge of 77 . c. f . s . <br /> We would then recommend using a 48" c .m.p. <br /> Please contact me if you have any questions . <br /> Sincerely yours , <br /> Environmental Coordinator <br /> DWBowman :ms S <br /> Copy : <br /> George Wear <br /> 07-1 <br />