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State Reg. <br />Detention Storage Time • <br />Approximate detention time can be calculated as follows: <br />Td = Lp' (reference: Hann and Barfield) <br />where: Q10 <br />Td =detention time <br />L =length of the flow path in the reservoir (feet) <br />A =average cross-sectional area of the reservoir (fee12) (perpen- <br />dicular to the flow path) <br />Q 10 = is the peak discharge fora 10 year-24 hour precipitation event. <br />Td - (2300 ft.)ff5 30ct.2) = 126,951 sec. = 35.3 hours <br />Water Quality <br />Seneca Coals, Ltd. has in the past and will in the future continue to moni- <br />for the water discharged from the Wadge Impoundment. Results of pre- <br />vious monitoring are illustrated in Surface Water Information (Table 7-20 • <br />and Section III,A,ii -Surface Water (duality). <br /> <br />7-6-2-3 <br />ra~~isea s/2~/ai <br />