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Economic assessment <br /> r <br /> Assume retention pond volume costs$0.03/gallon <br /> Assume ha ling to Stockton wastewater treatment pcant costs$0.05/gallon <br /> ;ase I <br /> Annualized (10%interest over 10 ears) <br /> Capital cost $153,351 $24,996 <br /> - Annual haul and disposal cost $35,865 $35,865 <br /> Total annual cost $60,862 <br /> Case II <br /> Capital cost $107,133 $17,463 <br /> Annual haul and disposal cost $17,776 $17,776 <br /> Total annual cost $35,239 <br /> Case III <br /> l j <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 /> Assume C=j 1 <br /> Assume time of concentration= 10 minutes <br /> i= 0.25 inches 1.5 inches per tour <br /> Area= 16.615 acres assuming site is drained ditches <br /> .t= 25 cfs <br /> Assume ditch slope= 0.0001 ft/ft <br /> Limit maximum velocity to 2 ft/sec Estimated u ing Manning equation 1.4 ft/sec <br /> Cross-sectional area= 12.5 ft2 <br /> Maximum ditch cross-section 3 ft dee 2:1 sideslopes; 12 ft wide <br /> Elevation fall over 2,400 feet 024 feet <br /> FN: dtr/a-\WATERBAL.XLS Page 5 of 5 Printed:8131/94 3:46 PM <br />