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%7,MIN C. 4230 Kiernan Ave..Ste.15DI hlcdeab CA 953561 Ph:(209}543-17%I Fax:(269)543-1775 <br /> CTE#25-1256G <br /> INFILTRATION RATE PER PORCHET METHOD <br /> Reference:'Riverside County-Low Impact Development BMP Design Handbook"(Page 20) <br /> Percolation Data at the Final Interval <br /> Initial Depth Change in Height Average Head Over <br /> Time Interval of Water in Final Depth of Water in of Water in inches Time Interval in <br /> Test No. Radius (At) inches(D o) inches (Df) (AH) inches(Haug) <br /> P-1: 2.0 10.00 6.00 5.50 0.50 5.75 <br /> Infiltration Rate It=(AH 60 r)/At(r+2Hav9) <br /> ► P-1: It=(0.50 in)(60 min/hr)(2 in)/(10 min)(2 in+2(5.75 in))= 0.44 in/hr <br /> 1111 <br /> Infiltration Rate in gal/sf/day=(It in/hr)(24 hr/day)(7.48 gal/cf)(ft/12 in) <br /> P-1= ((0.44)(24)(7.48))/12= 6.6 gal/sf/day <br />