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The estimated flow rate through the rock drain is 1.2 to 479 gallons per minute. <br />The seepage from the Fire Mountain Canal does not have a perceptible flow. <br />Therefore, even if the rock drain can only pass 1.2 gallons per minute, it is <br />adequate for the seepage from the Fire Mountain Canal. The perforated pipe in <br />the rock drain will significantly increase its flow capacity. <br />The rock drain including the upper wide and tapering segment of the drain will be <br />wrapped in geotextile fabric. Twelve inches of common fill will be placed over <br />the rock drain so as to protect against the entrance of surface water or leachate <br />from the coal processing waste. The perforated pipe in the rock drain will extend <br />the full length of the drain except for the final 20 feet which shall be a solid pipe. <br />The solid pipe will discharge into ditch D -J3. A screen shall be placed over the <br />outlet of the solid pipe to keep rodents out of the pipe. <br />Volume XI <br />TR -84 - 7 - 12/13 <br />