Laserfiche WebLink
<br />MINED LAND RECLAMATION DIVISION <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, CO 60203 <br />303 6663567 <br />FA X: 303 832-8106 <br /> <br />STATE OF COLORADO <br />pF COO <br />~~~ ~9 <br />wed <br />•.~~~1• <br />.~„~,vf <br />1976 <br />Roy Romer, <br />Governor <br />Fred R. Banta. <br />Division Director <br />DATE: January 16, 1991 <br />T0: Carl Mount <br />FROM: Berhan Keffelew <br />RE: p1R-72 / Orchard Valley (Analysis of Drainage Ditches to Convey Runoff <br />from Topsoil Pile Storage Areas) <br />As you requested, I have reviewed the calculations for the ditch and culvert <br />that will be utilized to convey runoff from topsoil storage areas. <br />The ditch calculation for the SUb-area #1 will have a velocity of 4.9 fps and <br />a peak flow of 3.6 cfs, which is also what the operator calculated. The <br />design calculation is also acceptable for the Sub-area #2, as submitted. <br />The Division also agrees with the operator's calculation for the 18-inch <br />culvert. The culvert will be able to handle the peak flow of 4.3 cfs without <br />any problem. The Division's calculations are enclosed. <br />gaw <br />Encls. <br />cc: Susan McCannon <br />2842E <br />