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[': <br />[ <br />c <br />f <br />·, <br />.-' <br />[ <br />[ <br />'r-- <br />.J <br />Economic assessment L I <br />I <br />Assume retention eond volume costs ~;0.03lgallon <br />Assume hauling to Stockton wastewator treatment plant costs $0.05/9allon <br />iase I <br />Annualized 10% interest over 1 0 ~ears) <br />Capital cost $153,351 $24,996 <br />Annual haul and disposal I:ost $35,865 $35,865 <br />Total annual cost $60,862 <br />Case II <br />._--- <br />Capital cost $107,133 $17,463 <br />Annual haul and disposal (lost $17,n6 $17,n6 <br />Total annual cost $35239 <br />Case III <br />C8j)ital cost $61,716 $10,060 <br />Annual haul and dIsposal (:ost $152,726 $152,726 <br />Total annual cost I $162,786 <br />L I <br />Estimate maximum ditch section for ru noff <br />Use rational formula O=CIA <br />I <br />AssumeC=1 1 <br />Assume time of concentration = 10 minutes <br />i= 0.25 inches 1.5 inches per hour <br />Area= 16.615 acres assumIng site is drained bv two ditches <br />.J= 25 cfs <br />Assume ditch slope= 0.0001 fIIlt <br />I <br />Limit maximum veloclty to 2 ftlsec Estimated using Manning equation 1.4 ftlsec <br />Cross-sectional area" I 12.~i ft2 <br />Maximum ditch cross-section 3 It deep 2:1 sidesloP4!S ; 12 It wide <br />I I <br />Elevation fall over 2,400 feet 024 feet <br />FN : dlr/a:\WATERBAL.XLS Page 5 of 5 Printed: 8131/943 :46 PM