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Exhibit 18 <br />• <br />SEPCAD+ _ gI1'G.1P-l'IIANNEL_ DES I CN <br />DITCH SA-D3C <br />IA'PUT VALUES: <br />Sli~xl;e TRAPEZOIDAL <br />.^-,luj•.. °_5.00 <br />oul~:>lu1• •, .1.00. ]. ^~ 1.00.1 <br />P,uttum h'iath 9.00 feet <br />RE.; UL'f;, <br />Stec; <br />1 ~loye DC 51;; 17 <br />Dcj~tl' 0.02 feet <br />TuP h`iQtL `.1.04 fcuC <br />Velocity 1.G~1 f1r;; <br />llydraulic Ra~.]ius 0.0~ fceC <br />'!auv'~il~E' n 0.085 <br />I'roude Number 1.'17 <br />-41p- Revised 9/27/91 , <br /> <br />