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L ■ A OWN dM <br /> IMP4 , NORTH AMERICAN TECHNICAL SERVICES, INC <br /> Project Site: 25071 S Lammers Rd,Tracy Job# 22-355G <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 /> Test Hole Initial Depth Final Depth of Change in Water Over Time <br /> Radius(r) Time Interval Water(H) Water (Hf) Height(4H) Interval(Havg) <br /> Test No. (inches) 4t(min) (inches) (inches) (Inches) (Inches) <br /> P 1: 3 30 6.00 5.00 1.00 5.50 <br /> Infiltration Rate (in/hr) <br /> Infiltration Rate 1=((4H)(60)(r))/(4t(r+2Havg)) <br /> P1: It(in/hr)=((1.0 in)(60 min/hr)(3 in))/((30 min)(3 in+2(5.50))= 0.43 <br /> Hole diam= 6" <br /> radius(r)= 3" <br /> Infiltration Rate Conversion to gal/sf/day <br /> Infiltration Rate in gal/sf/day= It(in/hr)(24 hr/day)(7.48 gal/cf)(ft/12 in) <br /> P1 = 6.41 gal/sf/day <br /> t � <br /> HU,avg =9.0" <br /> t i <br /> t � <br /> i <br /> i <br />