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%TE <br /> INC. 4233 Kiernan Ave.,Ste.7561 Modeslo,CA 953561 Ph:({239}M3 7799 I F.:{239}5431775 <br /> CTE#25-1084G <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(Do) inches (D f) (AH) inches(H avg) <br /> P-1: 2.0 30.00 6.00 5.25 0.75 5.63 <br /> P-2: 2.0 30.00 6.00 5.50 0.50 5.75 <br /> P-3: 2.0 30.00 6.00 5.50 0.50 5.75 <br /> Infiltration Rate It=(AH 60 r)/(At(r+2Hav9)) <br /> ► P-1: It=(0.75 in)(60 min/hr)(2 in)/((30 min)(2 in+2(5.63 in)))= 0.23 in/hr <br /> ► P-2: It=(0.50 in)(60 min/hr)(2 in)/((30 min)(2 in+2(5.75 in)))= 0.15 in/hr <br /> ► P-3: It=(0.50 in)(60 min/hr)(2 in)/((30 min)(2 in+2(5.75 in)))= 0.15 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= ((0.23)(24)(7.48))/12= 3.4 gal/sf/day <br /> P-2= ((0.15)(24)(7.48))/12= 2.2 gal/sf/day <br /> P-3= ((0.15)(24)(7.48))/12= 2.2 gal/sf/day <br />