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// CODE SNIPPET

903.5 Mound Dimensions

Private Sewage Disposal Code 2018 of South Holland > 9 Mound Systems > 903 System Design > 903.5 Mound Dimensions
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The mound height consists of the fill depth, bed or trench depth, the cap and topsoil depth.

903.5.1 Fill Depth

The fill depth (D) shall be not less than 1 foot (305 mm) for slowly permeable soils and permeable soils with high water tables and not less than 2 feet (610 mm) of fill shall be required for shallow permeable soils over bedrock. Additional fill shall be placed at the downslope end of the bed or trench where the site is not level so the bottom of the bed or trench is level. The downslope fill depth for bed systems shall be determined by the following equation:
(Equation 9-3)
For SI: 1 foot = 304.8 mm.
The downslope fill depth for trench systems shall be determined by the following equation:
(Equation 9-4)
For SI: 1 foot = 304.8 mm.

903.5.2 Bed or Trench Depth

The bed or trench depth (F) shall be not less than 9 inches (229 mm) and not less than 6 inches (152 mm) of aggregate shall be placed under the distribution pipes and not less than 2 inches (51 mm) of aggregate shall be placed over the top of the distribution pipes.

903.5.3 Cap and Topsoil Depth

The cap and topsoil depth (H) at the center of the mound shall be not less than 18 inches (457 mm), which includes 1 foot (305 mm) of subsoil and 6 inches (152 mm) of topsoil. Outer edges of the mound, G (the minimum cap and topsoil depth), shall be not less than 1 foot (305 mm), which includes 6 inches (152 mm) of subsoil and 6 inches (152 mm) of topsoil. The soil used for the cap shall be topsoil or finer textured subsoil.

903.5.4 Mound Lengths

The total mound length (L) shall be determined by the following equation:
(Equation 9-5)
For SI: 1 foot = 304.8 mm.
where:

903.5.5 Mound Widths

The mound width for a bed system shall be determined by the following equation:
(Equation 9-6)
For SI: 1 foot = 304.8 mm.
The mound width for a trench system shall be determined by the following equation:
(Equation 9-7)
For SI: 1 foot = 304.8 mm.
where:
J = 3(D + F + G)SU
I = 3(E + F + G)SD
The upslope correction factor (SU) and the downslope correction factor (SD) shall be determined based on the slope in accordance with Table 903.5.5.
TABLE 903.5.5
DOWNSLOPE AND UPSLOPE WIDTH CORRECTIONS FOR MOUNDS ON SLOPING SITES
SLOPE
(percent)
DOWNSLOPE CORRECTION
FACTOR (SD)
UPSLOPE CORRECTION
FACTOR (SU)
011
11.030.97
21.060.94
31.100.915
41.140.89
51.180.875
61.220.86
71.270.83
81.320.80
91.380.785
101.440.77
111.510.75
121.570.73

Related Code Sections


903.5 Mound Systems, Mound Dimensions
The mound height consists of the fill depth, bed or trench depth, the cap and topsoil depth ...
Private Sewage Disposal Code 2018 of South Holland > 9 Mound Systems > 903 System Design > 903.5 Mound Dimensions
903.5 Mound Systems, Mound Dimensions
The mound height consists of the fill depth, bed or trench depth, the cap and topsoil depth ...
Private Sewage Disposal Code 2012 of South Holland > 9 Mound Systems > 903 System Design > 903.5 Mound Dimensions
903.5.5 Mound Systems, Mound Widths
The mound width for a bed system shall be determined by the following equation: W = J + A + I (Equation 9-6) For SI: 1 foot = 304.8 mm ...
Private Sewage Disposal Code 2012 of South Holland > 9 Mound Systems > 903 System Design > 903.5 Mound Dimensions > 903.5.5 Mound Widths
903.5.1 Mound Systems, Fill Depth
The fill depth ( D ) shall be not less than 1 foot (305 mm) for slowly permeable soils and permeable soils with high water tables and not less than 2 ...
Private Sewage Disposal Code 2018 of South Holland > 9 Mound Systems > 903 System Design > 903.5 Mound Dimensions > 903.5.1 Fill Depth
903.5.1 Mound Systems, Fill Depth
The fill depth ( D ) shall be not less than 1 foot (305 mm) for slowly permeable soils and permeable soils with high water tables and not less than 2 ...
Private Sewage Disposal Code 2012 of South Holland > 9 Mound Systems > 903 System Design > 903.5 Mound Dimensions > 903.5.1 Fill Depth
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