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• Calculation Sheet 2 of 5 <br />PCI Sediment Pond l/1 <br />As Built <br />Calculation of Minimum Storage Volume <br />From equations derived from the inflow-outflow triangular hydrographs <br />on Figure 4.21 (Barfield, et al) determine the minimum storage volume <br />from equations derived from the inflow-outflow triangular hydrographs <br />on Figure 4.21 (Barfield, et al) determine the minimum storage volume <br />required to produce an average detention time (Td) of 24 hours,. Assume <br />sediment fill-up of pond at stage 0 or 2.5 feet. <br />Tpi = .464 hr. <br />V = .89 in. <br />Qpi = 1.617 in/hr. <br />• From Equation (c) <br />Tbi 2 V/Qpi = (2) (.89)/1.617 <br />= 1.101 hr. <br />Tri = Tbi - Tpl 1.101 hr. - .464 hr. <br />_ .637 hr. <br />From Equation (d) <br />Tmi = (Tpi/3) + (Tbi/3) _ (.464 hr./3) + (1.101 hr/3) <br />_ .522 hr. <br />• <br />