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Percolation Rate Conversion <br />Infiltration Rate, It <br />Porchet Method, aka Inverse Borehole Metho <br />St. Barbara Catholic School - Percolation Tests <br />Project No: D-6289-08 <br />Data collected at the Final Interval analysed: <br />Percolation Test PC-1 <br />CITY OF SANTA ANA <br />Planning and Building Agency <br />may, lS. <br />Approved <br />FOR PERMIT ISSUANCE <br />Master ID: <br />Date: <br />As per Test Result, Percolation Rate = 0.1199 inch/Min = 7.19 inch/hour <br />Time Interval, A t = 10 Minutes <br />Total Depth of Test Hole, Dt = 48 Inches <br />Test Hole Radius, r = 4 Inches <br />Initial Height of Water at the selected time interval, Ho <br />Final Height of Water at the Selected time interval, Hf <br />Change in Height over the time interval, A H <br />Average Head Height over the time interval, Hags <br />Tested Infiltration Rate, It <br />Therefore, it <br />it <br />Initial Depth to Water, Do = 20.5 Inches <br />Final Depth to Water, Df = 22.5 Inches <br />= 27.5 <br />Inches <br />(Dt - Do) <br />= 25.5 <br />Inches <br />(Dt - Df) <br />= 2 <br />Inches <br />(Ho - Hf) <br />= 26.5 <br />Inches <br />(Ha + Hf)/2 <br />= A H (60 r) /((A t)(r + 2 Ha„ g)) <br />0.842105 inch/hour <br />= 0.421053 inch/hour FS: <br />> 0.3 inch/hour requirement <br />PASSED <br />K <br />in/hr <br />INFILTRATION RATE PLATE - 5 <br />