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tnaI Parearwins <br /> VCAL.INC. an K. A".saINImade o.cAs"NI rn:Mw• <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" radius=3" <br /> Final Depth of Change in Height Average Head <br /> Time Interval Initial Depth of Water of Water Over Time Interval <br /> Test No. At(min) Water Do(in) Df(in) AH(in) Havg(in) <br /> P-1 X: 30 6.00 5.94 0.06 5.97 <br /> P-2: 10 6.00 4.50 1.50 5.25 <br /> P-3: 10 6.00 5.00 1.00 5.50 <br /> P-1: 30 6.00 4.13 1.88 5.06 <br /> t Infiltration Rate If=(OH 60 r)/Ot(r+2Havg) <br /> o. H=6.0" P-1X: If=(0.06 in)(60 min/hr)(3 in)/(30 min(3 in+2(5.97))= 0.03 in/hr <br /> P-2: If=(1.50 in)(60 min/hr)(3 in)/(10 min(3 in+2(5.25))= 2.00 in/hr <br /> P-3: If=(1.00 in)(60 min/hr)(3 in)/(10 min(3 in+2(5.50))= 1.29 in/hr <br /> ► P-1: It=(1.88 in)(60 min/hr)(3 in)/(30 min(3 in +2(5.06))= 0.86 in/hr <br /> 1111 � <br /> Infiltration Rate If in gal/sf/day=It(in/hr)(24 hr/day)(7.48 gal/cf)(ft/12 in) <br /> P-IX= 0.38 gal/sf/day (Old Leach Field Failed Test; Not Used) <br /> P-2= 29.92 gal/sf/day (French Drain Area) <br /> P-3= 19.23 gal/sf/day (French Drain Area) <br /> P-1 = 12.82 gal/sf/day (Leach Field Area) <br />