Sewage Pit Sidewall Area Chart

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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

Depth Feet Below Inlet	3' Diameter	4' Diameter	5' Diameter
1	9 sq. ft.	13 sq. ft.	16 sq. ft.
2	19 sq. ft.	25 sq. ft.	31 sq. ft.
3	28 sq. ft.	38 sq. ft.	47 sq. ft.
4	38 sq. ft.	50 sq. ft.	63 sq. ft.
5	47 sq. ft.	63 sq. ft.	79 sq. ft.
6	56 sq. ft.	75 sq. ft.	94 sq. ft.
7	66 sq. ft.	88 sq. ft.	110 sq. ft.
8	75 sq. ft.	101 sq. ft.	126 sq. ft.
9	85 sq. ft.	113 sq. ft.	141 sq. ft.
10	94 sq. ft.	126 sq. ft.	157 sq. ft.
11	104 sq. ft.	138 sq. ft.	173 sq. ft.
12	113 sq. ft.	151 sq. ft.	189 sq. ft.
13	122 sq. ft.	163 sq. ft.	204 sq. ft.
14	132 sq. ft.	176 sq. ft.	220 sq. ft.
15	141 sq. ft.	189 sq. ft.	236 sq. ft.
16	150 sq. ft.	201 sq. ft.	251 sq. ft.
17	160 sq. ft.	214 sq. ft.	267 sq. ft.
18	169 sq. ft.	226 sq. ft.	283 sq. ft.
19	179 sq. ft.	239 sq. ft.	299 sq. ft.
20	188 sq. ft.	251 sq. ft.	314 sq. ft.
21	198 sq. ft.	264 sq. ft.	330 sq. ft.
22	207 sq. ft.	277 sq. ft.	346 sq. ft.
23	217 sq. ft.	289 sq. ft.	361 sq. ft.
24	226 sq. ft.	302 sq. ft.	377 sq. ft.
25	236 sq. ft.	314 sq. ft.	393 sq. ft.
26	245 sq. ft.	327 sq. ft.	408 sq. ft.
27	254 sq. ft.	339 sq. ft.	424 sq. ft.
28	264 sq. ft.	352 sq. ft.	440 sq. ft.
29	273 sq. ft.	264 sq. ft.	456 sq. ft.
30	283 sq. ft.	377 sq. ft.	471 sq. ft.
31	292 sq. ft.	390 sq. ft.	487 sq. ft.
32	301 sq. ft.	402 sq. ft.	503 sq. ft.
33	310 sq. ft.	415 sq. ft.	518 sq. ft.
34	320 sq. ft.	427 sq. ft.	534 sq. ft.
35	330 sq. ft.	440 sq. ft.	550 sq. ft.
36	339 sq. ft.	452 sq. ft.	566 sq. ft.
37	348 sq. ft.	465 sq. ft.	581 sq. ft.
38	358 sq. ft.	478 sq. ft.	597 sq. ft.
39	367 sq. ft.	490 sq. ft.	613 sq. ft.
40	377 sq. ft.	503 sq. ft.	628 sq. ft.
41	386 sq. ft.	515 sq. ft.	644 sq. ft.
42	395 sq. ft.	528 sq. ft.	660 sq. ft.
43	405 sq. ft.	540 sq. ft.	675 sq. ft.
44	415 sq. ft.	553 sq. ft.	691 sq. ft.
45	424 sq. ft.	566 sq. ft.	707 sq. ft.
46	433 sq. ft.	578 sq. ft.	723 sq. ft.
47	442 sq. ft.	591 sq. ft.	738 sq. ft.
48	452 sq. ft.	603 sq. ft.	754 sq. ft.
49	462 sq. ft.	616 sq. ft.	770 sq. ft.
50	471 sq. ft.	628 sq. ft.	785 sq. ft.