Laserfiche WebLink
• Mr. Jeff Deckier <br />September 12, 1985 <br />Page Two <br />Design Emergency to handle 93.4 cfs. <br />Try: <br />12' bottom <br />3/1 sideslopes <br />I.5' flow line <br />1.0' free board <br />A=(12+21)/2x 1.5=24.75 <br />WP=12+4.7+4.7=21.4 <br />R = 24.75/21.4 = 1.15 <br />Q = 1.49/.04 (1.15)•67 (.01)•5 24.75 <br />Q = (37.25) (1.09) (.1) (24.75) = 100.5 cfs <br />100.5 cfs) 93.4 cfs OK <br />Adequacy Issue (4) and (7) <br />In the unusual event that the thickener tank would be completely drained, a pond <br />• volume of 2.2 acre-ft is required. The Colorado Department of Health has <br />determined that containment ponds for coal processing facilities should not <br />discharge; consequently, Pond 006 will be modified by sealing the existing principal <br />spillway and filling the emergency spillway. Maximum Pond 006 volume at 2 ft <br />freeboard will be 2.3 acre-ft, which will be adequate for completely draining the <br />thickener. <br />Wyoming Fuel Company will maintain a minimum 2 ft of freeboard at all times in <br />this pond. The water level will be lowered as necessary by one or more of the <br />following methods: <br />1. Pumping water back into the thickener. This will be the most desirable <br />procedure because plant start-up will be expedited by quickly refilling the <br />thickener tank after maintenance is complete. <br />Sediment removal to refuse disposal area. <br />3. Evaporation <br />Most discharges from the thickener will result from partial draining or occasional <br />overflows. These discharges will be clarified water from the upper portion of the <br />tank; i.e., most sediment will remain in the bottom cone. Upon completion of <br />maintenance, this water will be pumped from Pond 006 to refill the thickener. <br />• <br />