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Response to DRMS General Stormwater Comments — Cotter JD -9 Mine Drainage Design Plan <br />b. Please provide flow-velocities for each section or eliminate reference, indicating <br />FlowMaster results are appropriate. <br />Flow velocities are "included on the revised drawings in Attachment 5 and the <br />calculations can be seen on the worksheets in Attachment 3. <br />c. Please revise slopes, considering the response to Comment 3. <br />Channel slopes have been verified and corrected where necessary. Results can be <br />seen on the drawings and worksheets included in this document. <br />11. Sheet 7 of 7. Cross sections and details: <br />a. Section 20 -2. No analysis is provided for this swale. The 6 -inch depth will not <br />meet the minimum freeboard requirements in Comment 3. Please provide a <br />hydraulic analysis and revise the design to meet the DRMS requirements. <br />An analysis has been provided for this swale and is included in Attachment 3. The <br />swale has been deepened to a depth of 12" of freeboard above flow depth, as <br />requested. <br />b. Section 30 -2. The one foot design depth does not meet the minimum freeboard <br />requirements stipulated in Comment 3. Please revise the design to meet the <br />DBMS requirements. <br />All sections identified on the plan view in the drawings have been analyzed and <br />provided with appropriate freeboard. Results can be seen on the worksheet in <br />Attachment 3. , <br />c. Section 20 -3. Please demonstrate the one foot high berm has sufficient freeboard. <br />The diversion berm illustrated on the drawing and identified as Section 20-3 has <br />been analyzed for the-projected flow and demonstrated that it does have sufficient <br />freeboard. Results of this are found in Attachment 3. <br />d. Please provide details or sections identified as missing in Attachment A. <br />Details and analyses are provided for the requested sections identified in the review. <br />31 <br />