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-3- <br />• The control which generates the lowest flow at a given head is the control. <br />Please see the attached stage/discharge relationship. Several pages from <br />~ the Barfield and Haan text, Hydrology and Sedimentology of Surface Mined Land, <br />are included for reference to a routing technique. Please feel free to contact <br />this office for assistance in pursuing this method. <br />B. It may be possible to reduce the elevation of the crest of the emergency <br />spillway to allow for the one foot of freeboard requirement. Using the <br />equation: <br />3/2 <br />Q = 3.3 LH L = width of water surface <br />67 cfs = 3.3 (B + 4H)(H)3/2 <br />Solving for H: <br />H = 1.32 by iteration, <br />Design IYpth = Depth of flow (H) + freeboard (1') <br />Design Depth = 2.32' below crest of dam <br />4. Other Spillway Designs <br />[JF must use a weir equation, such as the one above, to provide accurate <br />estimates of depth of flow at the design flow for each emergency spillway. <br />This was done in the office and they were found to be adequate. However, <br />correct methods for design are required to be shown in the application and <br />• Manning's equation is not appropriate. <br />An attempt has been made to present not only technical errors, but correct <br />technical procedures to solve them. While it is mandatory that the problems <br />identified here be solved, the methods given are only suggestions. Wyoming <br />Fuel Company may use any defensible methods they wish. <br />1. B.J. Barfield and C.T. Haan, Hydrology and Sedimentology of Surface Mined <br />Lands, 1979, University of Kentucky Press. , <br />• <br />F 1 <br />