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Economic assessment <br /> Assume retention pond volume costs$0.03/gallon <br /> Assume haulinq to Stockton wastewaton,treatment plant costs$0.05/ ailan <br /> -;ase1 <br /> Capital cost Annualized (101/o interestover 0 year <br /> $153,351 $24,996 <br /> Annual haul and disposal ost <br /> $35,865 $35,865 <br /> Total annualCos, $60,862 <br /> Case 11 <br /> Capital cost $107,133 $17.463 <br /> Annual haul and disp2sal cost $17,776 $17,776 <br /> Total—annual cost--- <br /> Case III <br /> capital cost $61,716 $10,060 <br /> Annual haul and disposal Cost $152,726 _.$152,726 <br /> Total annual cost $162,786 <br /> Estimate maximum ditch section for runoff <br /> Use rational formula Q--CIA <br /> =:�_ <br /> Assume C= — <br /> L- <br /> tAssume time of concentration_= 10minutes0.25 inches 1.51 inches per hour <br /> i <br /> r—ea= 16,615 acres "assuming site is drained two ditches <br /> 25 cfs <br /> 5 c <br /> Assume ditch sic e= 0.0001 ft/ft <br /> Limit maximum VelOCItY to 2 ft/Sec OEsfimated usinN Manning equation 1.4 ft/sec, <br /> Cross-sectional area= 12.6 ft2 <br /> Maximum ditch cross-section 3 ft deep 2:1 sideslopes; 12 ft wide <br /> I Elevation fall over 2,400 feet 0.241 feet <br /> FN: dtr/a:\WATERBAL.XLS Page 5 of 5 Printed:8131/94 3:46 PM <br />