Seepage Pit Sidewall Area Chart
Effective sidewall absorption areas of seepage pits (per Appendix I, Sections 13 + 17, Uniform Plumbing Code). The effective absorption area should be exclusive of bedrock or impervious soils. Minimum of 12 feet to groundwater - diameters greater than 6 feet requires prior approval of the Administrative Authority. Seepage Pit Sidewall Area
Seepage Pit Sidewall Area |
Depth Feet Below Inlet | 3' Diameter | 4' Diameter | 5' Diameter |
SQ. FT. | SQ. FT. | SQ. FT. | |
1 | 9 | 13 | 16 |
2 | 19 | 25 | 31 |
3 | 28 | 38 | 47 |
4 | 38 | 50 | 63 |
5 | 47 | 63 | 79 |
6 | 56 | 75 | 94 |
7 | 66 | 88 | 110 |
8 | 75 | 101 | 126 |
9 | 85 | 113 | 141 |
10 | 94 | 126 | 157 |
11 | 104 | 138 | 173 |
12 | 113 | 151 | 189 |
13 | 122 | 163 | 204 |
14 | 132 | 176 | 220 |
15 | 141 | 189 | 236 |
16 | 150 | 201 | 251 |
17 | 160 | 214 | 267 |
18 | 169 | 226 | 283 |
19 | 179 | 239 | 299 |
20 | 188 | 251 | 314 |
21 | 198 | 264 | 330 |
22 | 207 | 277 | 346 |
23 | 217 | 289 | 361 |
24 | 226 | 302 | 377 |
25 | 236 | 314 | 393 |
26 | 245 | 327 | 408 |
27 | 254 | 339 | 424 |
28 | 264 | 352 | 440 |
29 | 273 | 364 | 456 |
30 | 283 | 377 | 471 |
31 | 292 | 390 | 487 |
32 | 301 | 402 | 503 |
33 | 310 | 415 | 518 |
34 | 320 | 427 | 534 |
35 | 330 | 440 | 550 |
36 | 339 | 452 | 566 |
37 | 348 | 465 | 581 |
38 | 358 | 478 | 597 |
39 | 367 | 490 | 613 |
40 | 377 | 503 | 628 |
41 | 386 | 515 | 644 |
42 | 395 | 528 | 660 |
43 | 405 | 540 | 675 |
44 | 415 | 553 | 691 |
45 | 424 | 566 | 707 |
46 | 433 | 578 | 723 |
47 | 442 | 591 | 738 |
48 | 452 | 603 | 754 |
49 | 462 | 616 | 770 |
50 | 471 | 628 | 785 |
ENVIRONMENTAL HEALTH DIVISION OF PUBLIC HEALTH SERVICES DEPARTMENT L31