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4230 Kx Ave_Ste 1501 Modesto.CA 953561 Ph:(209)N3.1799 1 Fa:(209)543-1775 <br /> CTE#25-0710G <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 /> diam= 6" Time Interval At=30 min <br /> Initial Depth Change in Height Average Head Over <br /> of Water in Final Depth of Water in of Water in inches Time Interval in <br /> radius= 3" inches(D,) inches (D1) (O H) inches(Haug) <br /> P 1 x: 6.00 5.94 0.06 5.97 <br /> P1: 6.00 4.13 1.88 5.06 <br /> Infiltration Rate 1,= Infiltration Rate 1,=(4H 60 r)/At(r+2Hav9) <br /> ♦ H(P1x)=6.0" P1x: It=(.06 in)(60 min/hr)(3 in)/((30 min)(3 in)+2(5.97))= 0.03 in/hr <br /> H(P1)=6.0" P1: I,=(.06 in)(60 min/hr)(3 in)/((30 min)(3 in)+2(5.06))= 0.86 in/hr <br /> ' 1 <br /> Infiltration Rate in gal/sf I day= It(in/hr)(24 hr/day)(7.48 gal I cf) (ft/12 in) <br /> Plx= 0.38 gal/sf/day <br /> P1 = 12.82 gal/sf/day <br />