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Site: 183 South Austin Road, Manteca <br />NORTH AMERICAN TECHNICAL SERVICES, INC <br />Job# 22-282G <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 <br />Initial Depth <br />Final Depth of <br />Change in Water <br />Over Time <br />Radius (r) <br />Time Interval <br />Water (H) <br />Water (Hf) <br />Height (AH) <br />Interval (Havg) <br />Test No. <br />(inches) <br />At (min) <br />(inches) <br />(inches) <br />(Inches) <br />(Inches) <br />P1: <br />3 <br />10 <br />6.00 <br />5.250 <br />0.750 <br />5.625 <br />Hale diam= 6" <br />radius (r)= 3" <br />" diam. Slotted Pipe <br />H1a,g = 5.625' <br />Infiltration Rate (in/hr) <br />Infiltration Rate Ir=((AH)(60)(r)) /(At(r+2Havg)) <br />P1: It (in/hr) = ((0.750 in)(60 min/hr)(3 in)) / ((10 min) (3 in + 2(5.625)) = 0.95 <br />Infiltration Rate Conversion togal/sf/day <br />Infiltration Rate in gal/sf/day = It(in/hr)(24 hr/day)(7.48 gal/cf)(ft/12 in) <br />P1 = 14.17 gal/sf/day <br />