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.- r` <br />-z- <br />I anticipate that you will be unable to show that the structures in their <br />current configuration can handle the 25 year-24 hour event. Therefore, you <br />have a couple of options. You may recalculate the flows based on the improved <br />cover at the site and/or you may revise the size and/or armoring of the <br />spillway and channels. Please note that rip-rap design should include <br />information of the filter bed as well as the D50, DID, D20 and DMax• <br />As a rule of thumb rip-rap will not survive flows greater than 10 fps nor <br />+r'roude numbers greater than 3. <br />Please submit this information to the Division within 45 days, with a schedule <br />for implementation by October 31, 1991. <br />Sincerely, <br />~~~ //~,Q ~lJ <br />Catherine W. Begej <br />Reclamation Specialist <br />CWB/eke <br />cc: Greystone Development Consultants <br />7461E <br />