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a <br />The following table shows estimated pond elevation versus discharge <br />for the case of tailwater control (at 894.0), a 36 inch diameter pipe, <br />and an estimated pipe length of 50 feet. <br />Head Discharge <br />Headwater feet . Length_ cfs <br />895.0 <br />1.0 <br />50 <br />34 <br />896.0 <br />2.0 <br />50 <br />47 <br />897.0 <br />3.0 <br />50 <br />59 <br />898.0 <br />: <br />50 <br />67 <br />The Minnesota Dept of Transportation outlet control curves were <br />used in the calculation. Inlet control was also checked but was not <br />critical. Note that the above assumption of high tailwater results in <br />discharges that may be lower than is actually the case. <br />EXISTING POND VOLUME -DISCHARGE RELATIONSHIPS: <br />The following table shows the relationship between storage and <br />discharge for the existing pond for various duration storm events. <br />Note that the critical duration storm varies for differing amounts of <br />available storage. <br />Land Use 30 m 1 hr 2 hr. 3 hr 6 hr 12 hr 24 hr 48 hr 96 hr <br />TP-40 2.40 2.90 3.40 3.80 4.30 5.10 5.90 7.00 8.20 <br />Lake 5.0 <br />Imp 66.9 <br />Pery 194.1 <br />1.0 <br />'12.0 <br />23.3 <br />1.2 <br />14.6 <br />23.5 <br />1.4 <br />17.1 <br />23.5 <br />1.6 <br />19.1 <br />23.5 <br />1.8 <br />21.6 <br />23.5 <br />2.1 <br />25.6 <br />23.5 <br />2.5 <br />29.6 <br />23.5 <br />2.9 <br />35.1 <br />23.5 <br />3.4 <br />41.1 <br />23.5 <br />Total <br />Vol. <br />36.3 <br />39.3 <br />42.0 <br />44.2 <br />46.9 <br />51.2 <br />55.6 <br />61.5 <br />68.0 <br />Store <br />30 AF <br />30.0 <br />30:0 <br />30.0 <br />30.0 <br />30.0 <br />30.0 <br />30.0 <br />30.0 <br />30.0 <br />AF out <br />6.3 <br />9.3 <br />12.0 <br />14.2 <br />16.9 <br />21.2 <br />25.6 <br />31.5 <br />38.0 <br />AF/day <br />out <br />302.4 <br />223.2 <br />144.0 <br />113.6 <br />67.6 <br />42.4 <br />25.6 <br />15.8 <br />9.5 <br />Q out <br />cfs <br />151.2 <br />111.6 <br />72.0 <br />56.8 <br />33.8 <br />21.2 <br />12.8 <br />7.9 <br />4.8 <br />Store <br />35 AF <br />35.0 <br />35.0 <br />35.0 <br />35.0 <br />35.0 <br />35.0 <br />35.0 <br />35.0 <br />35.0 <br />AF out <br />1.3 <br />4.3 <br />7.0 <br />9.2 <br />11.9 <br />16.2 <br />20.6 <br />26.5 <br />33.0 <br />AF/day <br />out <br />62.4 <br />103.2 <br />84.0 <br />73.6 <br />47.6 <br />32.4 <br />20.6 <br />13.3 <br />8.2 <br />Q out <br />cfs <br />31.2 <br />51.6 <br />42.0 <br />36.8 <br />23.8 <br />16.2 <br />10.3 <br />6.7 <br />4.1 <br />Store <br />40 AF <br />40.0 <br />40.0 <br />40.0 <br />40.0 <br />40.0 <br />40.0 <br />40.0 <br />40.0 <br />40.0 <br />AF out <br />- <br />- <br />2.0 <br />4.2 <br />6.9 <br />11.2 <br />15.6 <br />21.5 <br />28.0 <br />AF/day <br />out <br />- <br />- <br />24.0 <br />33.6 <br />27.6 <br />22.4 <br />15.6 <br />10.8 <br />7.0 <br />Q out <br />cfs <br />- <br />- <br />12.0 <br />16.8 <br />13.8 <br />11.2 <br />7.8 <br />5.4 <br />3.5 <br />Store <br />45 aF <br />45.0 <br />45.0 <br />45.0 <br />45.0 <br />45.0 <br />45.0 <br />45.0 <br />45.0 <br />45.0 <br />AF out <br />- <br />- <br />- <br />- <br />1.9 <br />6.2 <br />10.6 <br />16.5 <br />23.0 <br />AF/day <br />out <br />- <br />- <br />- <br />- <br />7.6 <br />1204 <br />10.6 <br />8.3 <br />5.8 <br />Q out <br />cfs <br />- <br />- <br />- <br />- <br />3.8 <br />6.2 <br />5.3 <br />4.2 <br />2.9 <br />