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// CODE SNIPPET

903.1 Mound Dimensions and Design

Private Sewage Disposal Code 2018 of South Holland > 9 Mound Systems > 903 System Design > 903.1 Mound Dimensions and Design
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For one- and two-family dwellings and other buildings with estimated waste-water flows less than 600 gallons (2271 L) per day, the mound dimensions shall be determined in accordance with this section or Tables 903.1(1) through 903.1(12). Dimensions and corresponding letter designations listed in the tables and referenced in this section are shown in Appendix A, Figures A-6 through A-10. For buildings with estimated waste-water flows exceeding 600 gallons (2271 L) per day, the mound shall be designed in accordance with this section. Daily wastewater flow shall be estimated as 150 gallons (568 L) per day per bedroom for one- and two-family dwellings. For other buildings the total daily wastewater flow shall be determined in accordance with Table 802.7.2.
TABLE 903.1(1)
DESIGN CRITERIA FOR A MOUND FOR A ONE-BEDROOM HOME ON A 0- TO 6-PERCENT SLOPE WITH LOADING RATES OF 150 GALLONS PER DAY FOR SLOWLY PERMEABLE SOIL
DESIGN PARAMETERSLOPE (percent)
0246
ATrench width, feet3333
BTrench length, feet
Number of trenches
42
1
42
1
42
1
42
1
DMound height, inches12121212
FMound height, inches9999
GMound height, inches12121212
HMound height, inches18181818
IMound width, feeta15151515
JMound width, feeta11888
KMound length, feet10101010
LMound length, feet62626262
PDistribution pipe length, feet
Distribution pipe diameter, inches
Number of holes per distribution pipeb
Hole spacing, inchesb
Hole diameter, inchesb
20
1
9
30
0.25
20
1
9
30
0.25
20
1
9
30
0.25
20
1
9
30
0.25
WMound width, feet25262626
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 gallon = 3.785 L.
  1. Additional width to obtain required basal area.
  2. Last hole is located at the end of the distribution pipe, which is 15 inches from the other hole.
TABLE 903.1(2)
DESIGN CRITERIA FOR A TWO-BEDROOM HOME FOR A MOUND ON A 0- TO 6-PERCENT SLOPE WITH LOADING RATES OF 300 GALLONS PER DAY FOR SLOWLY PERMEABLE SOIL
DESIGN PARAMETERSLOPE (percent)
0246
ATrench width, feet3333
BTrench length, feet
Number of trenches
42
2
42
2
42
2
42
2
CTrench spacing, feet15151515
DMound height, inches12121212
EMound height, inches12172525
FMound height, inches9999
GMound height, inches12121212
HMound height, inches18181818
IMound width, feeta12202020
JMound width, feet12888
KMound length, feet10101010
LMound length, feet62626262
PDistribution pipe length, feet
Distribution pipe diameter, inches
Number of holes per distribution pipeb
Hole spacing, inchesb
Hole diameter, inches
20
1
9
30
0.25
20
1
9
30
0.25
20
1
9
30
0.25
20
1
9
30
0.25
RManifold length, feet
Manifold diameter, inchesc
15
2
15
2
15
2
15
2
WMound width, feet42464646
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 gallon = 3.785 L.
  1. Additional width to obtain required basal area.
  2. Last hole is located at the end of the distribution pipe, which is 15 inches from the other hole.
  3. Diameter dependent on the size of pipe from pump and inlet position.
TABLE 903.1(3)
DESIGN CRITERIA FOR A THREE-BEDROOM HOME FOR A MOUND ON A 0- TO 6-PERCENT SLOPE WITH LOADING RATES OF 450 GALLONS PER DAY FOR SLOWLY PERMEABLE SOIL
DESIGN PARAMETERSLOPE (percent)
0246
ATrench width, feet3333
BTrench length, feet
Number of trenches
63
2
63
2
63
2
63
2
CTrench spacing, feet15151515
DMound height, inches12121212
EMound height, inches12172025
FMound height, inches9999
GMound height, inches12121212
HMound height, inches18181818
IMound width, feeta12202020
JMound width, feeta12888
KMound length, feet10101010
LMound length, feet62626262
PDistribution pipe length, feet
Distribution pipe diameter, inches
Number of holes per distribution pipeb
Hole spacing, inchesb
Hole diameter, inches
31
11/4
13
30
0.25
31
11/4
13
30
0.25
31
11/4
13
30
0.25
31
11/4
13
30
0.25
RManifold length, feet
Manifold diameter, inchesc
15
2
15
2
15
2
15
2
WMound width, feet42464646
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 gallon = 3.785 L.
  1. Additional width to obtain required basal area.
  2. First hole is located 12 inches from the manifold.
  3. Diameter dependent on the size of pipe from pump and inlet position.
TABLE 903.1(4)
DESIGN CRITERIA FOR A FOUR-BEDROOM HOME FOR A MOUND ON A 0- TO 6-PERCENT SLOPE WITH LOADING RATES OF 600 GALLONS PER DAY FOR SLOWLY PERMEABLE SOIL
DESIGN PARAMETERSLOPE (percent)
0246
ATrench width, feet3333
BTrench length, feet
Number of trenches
56
3
56
3
56
3
56
3
CTrench spacing, feet15151515
DMound height, inches12121212
EMound height, inches12202836
FMound height, inches9999
GMound height, inches12121212
HMound height, inches24242424
IMound width, feeta12202020
JMound width, feeta12888
KMound length, feet12121214
LMound length, feet80808084
PDistribution pipe length, feet
Distribution pipe diameter, inches
Number of holes per distribution pipeb
Hole spacing, inchesb
Hole diameter, inches
27.5
11/4
12
30
0.25
27.5
11/4
12
30
0.25
27.5
11/4
12
30
0.25
27.5
11/4
12
30
0.25
RManifold length, feet
Manifold diameter, inchesc
30
2
30
2
30
2
30
2
WMound width, feet57616161
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 gallon = 3.785 L.
  1. Additional width to obtain required basal area.
  2. Last hole is located at the end of the distribution pipe, which is 15 inches from the previous hole.
  3. Diameter dependent on the size of pipe from pump and inlet position.
TABLE 903.1(5)
DESIGN CRITERIA FOR A ONE-BEDROOM HOME FOR A MOUND ON A 0- TO 12-PERCENT SLOPE WITH LOADING RATES OF 150 GALLONS PER DAY FOR SHALLOW PERMEABLE SOIL OVER CREVICED BEDROCK
DESIGN PARAMETERPERCOLATION RATE (minutes per inch)
SLOPE (percent)
3 to 603 to less than 30
0246810a12a
ABed width, feetb10101010101010
BBed length, feet13131313131313
DMound height, inches24242424242424
EMound height, inches24262931343638
FMound height, inches9999999
GMound height, inches12121212121212
HMound height, inches18181818181818
IMound width, feet12131417182126
JMound width, feet12111010999
KMound length, feet12121213131315
LMound length, feet37373739393943
PDistribution pipe length, feetc
Distribution pipe diameter, inches
Number of distribution pipes
12.5
1
6
12.5
1
6
12.5
1
6
12.5
1
6
12.5
1
6
12.5
1
6
12.5
1
6
RManifold length, feet
Manifold diameter, inchesc
6
2
6
2
6
2
6
2
6
2
6
2
6
2
SDistribution pipe spacing, feet
Number of holes per distribution piped
Hole spacing, inchesd
Hole diameter, inches
3
6
30
0.25
3
6
30
0.25
3
6
30
0.25
3
6
30
0.25
3
6
30
0.25
3
6
30
0.25
3
6
30
0.25
WMound width, feet34343437374145
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 gallon = 3.785 L, 1 minute per inch = 2.4 s/mm.
  1. On sites with a 10- to 12-percent slope, the fill depth (D) shall be reduced to not less than 1.5 feet or the bed width shall be reduced to decrease E (downslope fill depth, feet).
  2. Bed widths shall not be limited.
  3. Use a manifold with distribution pipes on only one side.
  4. Last hole is located at the end of the distribution pipe, which is 15 inches from the previous hole.
TABLE 903.1(6)
DESIGN CRITERIA FOR A TWO-BEDROOM HOME FOR A MOUND ON A 0- TO 12-PERCENT SLOPE WITH LOADING RATES OF 300 GALLONS PER DAY FOR SHALLOW PERMEABLE SOIL OVER CREVICED BEDROCK
DESIGN PARAMETERPERCOLATION RATE (minutes per inch)
SLOPE (percent)
3 to 603 to less than 30
0246810a12a
ABed width, feetb10101010101010
BBed length, feet25252525252525
DMound height, inches24242424242424
EMound height, inches24262931343638
FMound height, inches9999999
GMound height, inches12121212121212
HMound height, inches18181818181818
IMound width, feet12131417182126
JMound width, feet12111010999
KMound length, feet12121213131315
LMound length, feet49494951515155
PDistribution pipe length, feetc
Distribution pipe diameter, inches
Number of distribution pipes
12
1
6
12
1
6
12
1
6
12
1
6
12
1
6
12
1
6
12
1
6
RManifold length, feet
Manifold diameter, inches
6
2
6
2
6
2
6
2
6
2
6
2
6
2
SDistribution pipe spacing, feet
Number of holes per distribution piped
Hole spacing, inchesd
Hole diameter, inches
3
5
30
0.25
3
5
30
0.25
3
5
30
0.25
3
5
30
0.25
3
5
30
0.25
3
5
30
0.25
3
5
30
0.25
WMound width, feet34343437374145
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 gallon = 3.785 L, 1 minute per inch = 2.4 s/mm.
  1. On sites with a 10- to 12-percent slope, the fill depth (D) shall be reduced to not less than 1.5 feet or the bed width shall be reduced to decrease E (downslope fill depth, feet).
  2. Bed widths shall not be limited.
  3. This design is based on a manifold with distribution pipes on both sides. An alternative design basis is 24-foot distribution pipes, with manifold at the end.
  4. Last hole is located 9 inches from the end of the distribution pipe.
TABLE 903.1(7)
DESIGN CRITERIA FOR A THREE-BEDROOM HOME FOR A MOUND ON A 0- TO 12-PERCENT SLOPE WITH LOADING RATES OF 450 GALLONS PER DAY FOR SHALLOW PERMEABLE SOIL OVER CREVICED BEDROCK
DESIGN PARAMETERPERCOLATION RATE (minutes per inch)
SLOPE (percent)
3 to 603 to less than 30
0246810a12a
ABed width, feetb10101010101010
BBed length, feet38383838383838
DMound height, inches24242424242424
EMound height, inches24262931343638
FMound height, inches9999999
GMound height, inches12121212121212
HMound height, inches18181818181818
IMound width, feet12131417182126
JMound width, feet12111010999
KMound length, feet12121213131315
LMound length, feet62626264646468
PDistribution pipe length, feetc
Distribution pipe diameter, inches
Number of distribution pipes
18.5
1
6
18.5
1
6
18.5
1
6
18.5
1
6
18.5
1
6
18.5
1
6
18.5
1
6
RManifold length, feet
Manifold diameter, inches
6
2
6
2
6
2
6
2
6
2
6
2
6
2
SDistribution pipe spacing, feet
Number of holes per distribution piped
Hole spacing, inchesd
Hole diameter, inches
3
8
30
0.25
3
8
30
0.25
3
8
30
0.25
3
8
30
0.25
3
8
30
0.25
3
8
30
0.25
3
8
30
0.25
WMound width, feet34343437374145
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 gallon = 3.785 L, 1 minute per inch = 2.4 s/mm.
  1. On sites with a 10- to 12-percent slope, the fill depth (D) shall be reduced to not less than 1.5 feet or the bed width shall be reduced to decrease E (downslope fill depth, feet).
  2. Bed widths shall not be limited.
  3. Use a manifold with distribution pipes on only one side.
  4. Last hole is located at the end of the distribution pipe, which is 27 inches from the previous hole.
TABLE 903.1(8)
DESIGN CRITERIA FOR A FOUR-BEDROOM HOME FOR A MOUND ON A 0- TO 12-PERCENT SLOPE WITH LOADING RATES OF 600 GALLONS PER DAY FOR SHALLOW PERMEABLE SOIL OVER CREVICED BEDROCK
DESIGN PARAMETERPERCOLATION RATE (minutes per inch)
SLOPE (percent)
3 to 603 to less than 30
0246810a12a
ABed width, feetb10101010101010
BBed length, feet50505050505050
DMound height, inches24242424242424
EMound height, inches24262931343638
FMound height, inches9999999
GMound height, inches12121212121212
HMound height, inches18181818181818
IMound width, feet12131417182126
JMound width, feet12111010999
KMound length, feet12121213131315
LMound length, feet74747476767678
PDistribution pipe length, feetc
Distribution pipe diameter, inches
Number of distribution pipes
24.5
1
6
24.5
1
6
24.5
1
6
24.5
1
6
24.5
1
6
24.5
1
6
24.5
1
6
RManifold length, feet
Manifold diameter, inches
6
2
6
2
6
2
6
2
6
2
6
2
6
2
SDistribution pipe spacing, feet
Number of holes per distribution piped
Hole spacing, inchesd
Hole diameter, inches
3
10
30
0.25
3
10
30
0.25
3
10
30
0.25
3
10
30
0.25
3
10
30
0.25
3
10
30
0.25
3
10
30
0.25
WMound width, feet34343437374145
For SI: 1 inch 25.4 mm, 1 foot = 304.8 mm, 1 gallon = 3.785 L, 1 minute per inch = 2.4 s/mm.
  1. On sites with a 10- to 12-percent slope, the fill depth (D) shall be reduced to not less than 1.5 feet or the bed width shall be reduced to decrease E (downslope fill depth, feet).
  2. Bed widths shall not be limited.
  3. Use a manifold with distribution pipes on only one side.
  4. Last hole is located 9 inches from the end of the distribution pipe.
TABLE 903.1(9)
DESIGN CRITERIA FOR A ONE-BEDROOM HOME FOR A MOUND ON A 0- TO 12-PERCENT SLOPE WITH LOADING RATES OF 150 GALLONS PER DAY FOR PERMEABLE SOIL WITH A HIGH WATER TABLE
DESIGN PARAMETERPERCOLATION RATE (minutes per inch)
SLOPE (percent)
0 to 600 to less than 30
024681012
ABed width, feet4444444
BBed length, feet32323232323232
DMound height, inches12121212121212
EMound height, inches12131414161718
FMound height, inches9999999
GMound height, inches12121212121212
HMound height, inches18181818181818
IMound width, feet9101112131415
JMound width, feet9988776
KMound length, feet10101010101111
LMound length, feet52525252525353
PDistribution pipe length
Distribution pipe diameter, inches
Number of distribution pipes
Number of holes per distribution pipea
Hole spacing, inchesa
Hole diameter, inches
15.5
1
2
7
30
0.25
15.5
1
2
7
30
0.25
15.5
1
2
7
30
0.25
15.5
1
2
7
30
0.25
15.5
1
2
7
30
0.25
15.5
1
2
7
30
0.25
15.5
1
2
7
30
0.25
WMound width, feet22232324242525
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 gallon = 3.785 L, 1 minute per inch = 2.4 s/mm.
  1. Last hole is located at the end of the distribution pipe, which is 21 inches from the previous hole.
TABLE 903.1(10)
DESIGN CRITERIA FOR A TWO-BEDROOM HOME FOR A MOUND ON A 0- TO 12-PERCENT SLOPE WITH LOADING RATES OF 300 GALLONS PER DAY FOR PERMEABLE SOIL WITH A HIGH WATER TABLE
DESIGN PARAMETERPERCOLATION RATE (minutes per inch)
SLOPE (percent)
0 to 600 to less than 30
024681012
ABed width, feet6666666
BBed length, feet42424242424242
DMound height, inches12121212121212
EMound height, inches12131417181922
FMound height, inches9999999
GMound height, inches12121212121212
HMound height, inches18181818181818
IMound width, feet9101112131516
JMound width, feet9988776
KMound length, feet10101010101111
LMound length, feet62626262626464
PDistribution pipe length, feeta
Distribution pipe diameter, inches
Number of distribution pipes
20
1
4
20
1
4
20
1
4
20
1
4
20
1
4
20
1
4
20
1
4
RManifold length, feet
Manifold diameter, inches
3
2
3
2
3
2
3
2
3
2
3
2
3
2
SDistribution pipe spacing, feet
Number of holes per distribution pipeb
Hole spacing, inchesb
Hole diameter, inches
3
9
30
0.25
3
9
30
0.25
3
9
30
0.25
3
9
30
0.25
3
9
30
0.25
3
9
30
0.25
3
9
30
0.25
WMound width, feet24252526262829
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 gallon = 3.785 L, 1 minute per inch = 2.4 s/mm.
  1. Use a manifold with distribution pipes only on one side.
  2. Last hole is located at the end of the distribution pipe, which is 15 inches from the previous hole.
TABLE 903.1(11)
DESIGN CRITERIA FOR A THREE-BEDROOM HOME FOR A MOUND ON A 0- TO 12-PERCENT SLOPE WITH LOADING RATES OF 450 GALLONS PER DAY FOR PERMEABLE SOIL WITH A HIGH WATER TABLE
DESIGN PARAMETERPERCOLATION RATE (minutes per inch)
SLOPE (percent)
0 to 600 to less than 30
024681012
ABed width, feet8888888
BBed length, feet47474747474747
DMound height, inches12121212121212
EMound height, inches12121618192224
FMound height, inches9999999
GMound height, inches12121212121212
HMound height, inches18181818181818
IMound width, feet9111213151718
JMound width, feet9988776
KMound length, feet10101010101112
LMound length, feet67676767696971
PDistribution pipe length, feet
Distribution pipe diameter, inches
Number of distribution pipes
23
1
6
23
1
6
23
1
6
23
1
6
23
1
6
23
1
6
23
1
6
RManifold length, feet
Manifold diameter, inches
64
2
64
2
64
2
64
2
64
2
64
2
64
2
SDistribution pipe spacing, feet
Number of holes per distribution pipea
Hole spacing, inchesa
Hole diameter, inches
32
10
30
0.25
32
10
30
0.25
32
10
30
0.25
32
10
30
0.25
32
10
30
0.25
32
10
30
0.25
32
10
30
0.25
WMound width, feet26282829303232
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 gallon = 3.785 L, 1 minute per inch = 2.4 s/mm.
  1. Last hole is located at the end of the distribution pipe, which is 21 inches from the previous hole.
TABLE 903.1(12)
DESIGN CRITERIA FOR A FOUR-BEDROOM HOME FOR A MOUND ON A 0- TO 12-PERCENT SLOPE WITH LOADING RATES OF 600 GALLONS PER DAY FOR PERMEABLE SOIL WITH A HIGH WATER TABLE
DESIGN PARAMETERPERCOLATION RATE (minutes per inch)
SLOPE (percent)
0 to 600 to less than 30
024681012
ABed width, feet10101010101010
BBed length, feet50505050505050
DMound height, inches12121212121212
EMound height, inches12141719222426
FMound height, inches9999999
GMound height, inches12121212121212
HMound height, inches18181818181818
IMound width, feet9111314171819
JMound width, feet9988776
KMound length, feet10101010111112
LMound length, feet70707070727274
PDistribution pipe length, feet
Distribution pipe diameter, inches
Number of distribution pipes
24.5
1
6
24.5
1
6
24.5
1
6
24.5
1
6
24.5
1
6
24.5
1
6
24.5
1
6
RManifold length, feet
Manifold diameter, inches
6
2
6
2
6
2
6
2
6
2
6
2
6
2
SDistribution pipe spacing, feet
Number of holes per distribution pipea
Hole spacing, inchesa
Hole diameter, inches
3
10
30
0.25
3
10
30
0.25
3
10
30
0.25
3
10
30
0.25
3
10
30
0.25
3
10
30
0.25
3
10
30
0.25
WMound width, feet28293132343536
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 gallon = 3.785 L, 1 minute per inch = 2.4 s/mm.
  1. Last hole is 9 inches from the end of the distribution pipe.
SEE MORE

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Code diagrams
Unpack the code through illustrations and descriptions.
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