DRAINAGE AREA =4,800 SQ. FT. = 0.110 ACRES <br />AVERAGE RUNOFF COEFFICIENT (C) =0.90 <br />LENGTH OF DRYWELL = 16 FEET <br />WIDTH OF DRYWELL = 16 FEET <br />DEPTH OF DRYWELL = 7 FEET <br />VOID RATIO OF DRYWELL =30% <br />AVERAGE PERMEABILITY OF SOIL =2.50 INCHES/HR <br />SURFACE AREA OF BOTTOM =256 SQ. FT. <br />SURFACE AREA OF SIDES =448 SQ. FT. <br />OUTFLOW CAPACITY OF DRYWELL =53.3 CU. FT./HR = 6.65 GALLONS PER MINUTE <br />MAXIMUM STORAGE CAPACITY OF DRYWELL = 537.6 CU. FT. OF WATER <br />DRYWELL VOLUME = 66.4 CUBIC YARDS <br />5 YEAR TOTAL <br />RECURRENCE RAINFALL TOTAL OUTFLOW <br />DURATION DURATION RAINFALL DURING STORM EVENT FROM STORAGE <br />OF STORM OF STORM INTENSITY STORM RUNOFF DRYWELL REQUIRED DRYWELL <br />IN MINUTES IN HOURS IN/HR INCHES CU. FT. CU. FT. CU. FT. SIZING <br />5 0.08 2.50 0.21 75 4 71 OK <br />10 0.17 1.95 0.33 117 9 108 OK <br />15 0.25 1.42 0.36 128 13 114 OK <br />20 0.33 1.24 0.41 149 18 131 OK <br />30 0.50 1.00 0.50 180 27 153 OK <br />60 1.00 0.64 0.64 230 53 177 OK <br />120 2.00 0.48 0.96 346 107 239 OK <br />180 3.00 0.42 1.26 454 160 294 OK <br />240 4.00 0.38 1.52 547 213 334 OK <br />360 6.00 0.35 2.10 756 320 436 OK <br />480 8.00 0.33 2.64 950 427 524 OK <br />600 10.00 0.28 2.80 1,008 533 475 OK <br />720 12.00 0.24 2.88 1,037 640 397 OK <br />900 15.00 0.19 2.85 1,026 800 226 OK <br />1,080 18.00 0.18 3.24 1,166 960 206 OK <br />1,260 21.00 0.17 3.57 1,285 1,120 165 OK <br />1,440 24.00 0.15 3.60 1,296 1,280 16 OK <br />1,800 30.00 0.10 3.00 1,080 1,600 EMPTY OK <br />SOAKAGE TRENCH CALCULATIONS FOR <br />TAX LOT 17-03-16-23-2800 <br />See Attached Infiltration Test