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CaLculacion Sheet 5 of 5 <br />PCI Sediment Pond I/1 <br />As Built <br />r1 <br />LJ <br />Detention Time (7" Orifice) <br />Sediment Pond 111 <br />• <br />Area of orifice = <br />Qpo = <br />Qpo converted to inches/hr. _ <br />Tbo = (2 V)/Qpo = (2)(.89)/.011 = <br />Tpo Tbi - (Tri(Qpo/Qpi)) <br />= 1.101 hr. - (.637 hr.(.011 in/hr./1.617 in/hr.)) <br />Tmo = (Tpo/3) + (Tbo/3) <br />_ (1.097 hr./3) + (161.818 hr./3) _ <br />Td Tmo - Tmi <br />= 54.305 hr. - .522 hr. _ <br />.267 ft2 <br />3.278 cfs <br />.011 in/hr. <br />161.818 hr. <br />1.097 hr. <br />54,305 hr. <br />53.783 hr. <br /> <br />