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PERMFILE122284
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PERMFILE122284
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Entry Properties
Last modified
8/24/2016 10:20:22 PM
Creation date
11/25/2007 10:14:53 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980006A
IBM Index Class Name
Permit File
Doc Date
5/17/2004
Section_Exhibit Name
Part 816 Surface Mining Activities
Media Type
D
Archive
Yes
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Section 816.46(c) Continued. <br />from the entire area to be disturbed by mining within the tributary <br />watershed. Runoff from undisturbed areas which is to be diverted by <br />ditches out of the tributary watershed was not considered in the pond <br />design. <br />The detention time for each pond has been designed to be a minimum of <br />24 hours, and longer if necessary, to meet the applicable effluent <br />limitations with respect to Total Suspended Solids. The detention <br />time, as calculated in Exhibit 42, Drainage and Sediment Control <br />Plan, is considered to be the time interval between the centroid of <br />the inflow hydrograph and the centroid of the outflow hydrograph of <br />the design event. Each outlet device is sized to provide the proper <br />discharge rate so that the detention time meets the design criteria. <br />Each pond has a unique inflow hydrograph which is controlled by the <br />hydrology of the upstream watershed. The outflow hydrograph is <br />established by the physical design of the outlet device and can be <br />variable. The correct size of outlet device was selected by deriving <br />the proper outflow hydrograph so that a detention time of at least 24 <br />hours is provided. <br />(d) Dewatering. The water storage resulting from inflow shall be removed <br />by a nonclogging dewatering device or a conduit spillway approved by the <br />regulatory authority, and shall have a discharge rate to achieve and <br />maintain the required theoretical detention time. The dewatering device <br />shall not be located at a lower elevation than the maximum elevation of <br />the sedimentation storage volume. <br />Inflow to each pond will be routed through an outlet device <br />consisting of a riser pipe with drain holes specifically designed to <br />provide the 24-hour design detention time. Each outlet device will <br />have a wire mesh cover to prevent clogging. In no instances will the <br />816-51R Revised - January, 1991 <br />
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