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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.
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 PARAMETER | SLOPE (percent) | ||||
0 | 2 | 4 | 6 | ||
A | Trench width, feet | 3 | 3 | 3 | 3 |
B | Trench length, feet Number of trenches | 42 1 | 42 1 | 42 1 | 42 1 |
D | Mound height, inches | 12 | 12 | 12 | 12 |
F | Mound height, inches | 9 | 9 | 9 | 9 |
G | Mound height, inches | 12 | 12 | 12 | 12 |
H | Mound height, inches | 18 | 18 | 18 | 18 |
I | Mound width, feeta | 15 | 15 | 15 | 15 |
J | Mound width, feeta | 11 | 8 | 8 | 8 |
K | Mound length, feet | 10 | 10 | 10 | 10 |
L | Mound length, feet | 62 | 62 | 62 | 62 |
P | Distribution pipe length, feet Distribution pipe diameter, inches Number of holes per distribution pipebHole spacing, inchesb Hole diameter, inchesb | 20 1 930 0.25 | 20 1 930 0.25 | 20 1 930 0.25 | 20 1 930 0.25 |
W | Mound width, feet | 25 | 26 | 26 | 26 |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 gallon = 3.785 L.
- Additional width to obtain required basal area.
- Last hole is located at the end of the distribution pipe, which is 15 inches from the other hole.
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 PARAMETER | SLOPE (percent) | ||||
0 | 2 | 4 | 6 | ||
A | Trench width, feet | 3 | 3 | 3 | 3 |
B | Trench length, feet Number of trenches | 42 2 | 42 2 | 42 2 | 42 2 |
C | Trench spacing, feet | 15 | 15 | 15 | 15 |
D | Mound height, inches | 12 | 12 | 12 | 12 |
E | Mound height, inches | 12 | 17 | 25 | 25 |
F | Mound height, inches | 9 | 9 | 9 | 9 |
G | Mound height, inches | 12 | 12 | 12 | 12 |
H | Mound height, inches | 18 | 18 | 18 | 18 |
I | Mound width, feeta | 12 | 20 | 20 | 20 |
J | Mound width, feet | 12 | 8 | 8 | 8 |
K | Mound length, feet | 10 | 10 | 10 | 10 |
L | Mound length, feet | 62 | 62 | 62 | 62 |
P | Distribution pipe length, feet Distribution pipe diameter, inches Number of holes per distribution pipebHole spacing, inchesb Hole diameter, inches | 20 1 930 0.25 | 20 1 930 0.25 | 20 1 930 0.25 | 20 1 930 0.25 |
R | Manifold length, feet Manifold diameter, inchesc | 15 2 | 15 2 | 15 2 | 15 2 |
W | Mound width, feet | 42 | 46 | 46 | 46 |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 gallon = 3.785 L.
- Additional width to obtain required basal area.
- Last hole is located at the end of the distribution pipe, which is 15 inches from the other hole.
- Diameter dependent on the size of pipe from pump and inlet position.
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 PARAMETER | SLOPE (percent) | ||||
0 | 2 | 4 | 6 | ||
A | Trench width, feet | 3 | 3 | 3 | 3 |
B | Trench length, feet Number of trenches | 63 2 | 63 2 | 63 2 | 63 2 |
C | Trench spacing, feet | 15 | 15 | 15 | 15 |
D | Mound height, inches | 12 | 12 | 12 | 12 |
E | Mound height, inches | 12 | 17 | 20 | 25 |
F | Mound height, inches | 9 | 9 | 9 | 9 |
G | Mound height, inches | 12 | 12 | 12 | 12 |
H | Mound height, inches | 18 | 18 | 18 | 18 |
I | Mound width, feeta | 12 | 20 | 20 | 20 |
J | Mound width, feeta | 12 | 8 | 8 | 8 |
K | Mound length, feet | 10 | 10 | 10 | 10 |
L | Mound length, feet | 62 | 62 | 62 | 62 |
P | Distribution pipe length, feet Distribution pipe diameter, inches Number of holes per distribution pipebHole spacing, inchesb Hole diameter, inches | 31 11/4 1330 0.25 | 31 11/4 1330 0.25 | 31 11/4 1330 0.25 | 31 11/4 1330 0.25 |
R | Manifold length, feet Manifold diameter, inchesc | 15 2 | 15 2 | 15 2 | 15 2 |
W | Mound width, feet | 42 | 46 | 46 | 46 |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 gallon = 3.785 L.
- Additional width to obtain required basal area.
- First hole is located 12 inches from the manifold.
- Diameter dependent on the size of pipe from pump and inlet position.
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 PARAMETER | SLOPE (percent) | ||||
0 | 2 | 4 | 6 | ||
A | Trench width, feet | 3 | 3 | 3 | 3 |
B | Trench length, feet Number of trenches | 56 3 | 56 3 | 56 3 | 56 3 |
C | Trench spacing, feet | 15 | 15 | 15 | 15 |
D | Mound height, inches | 12 | 12 | 12 | 12 |
E | Mound height, inches | 12 | 20 | 28 | 36 |
F | Mound height, inches | 9 | 9 | 9 | 9 |
G | Mound height, inches | 12 | 12 | 12 | 12 |
H | Mound height, inches | 24 | 24 | 24 | 24 |
I | Mound width, feeta | 12 | 20 | 20 | 20 |
J | Mound width, feeta | 12 | 8 | 8 | 8 |
K | Mound length, feet | 12 | 12 | 12 | 14 |
L | Mound length, feet | 80 | 80 | 80 | 84 |
P | Distribution pipe length, feet Distribution pipe diameter, inches Number of holes per distribution pipebHole spacing, inchesb Hole diameter, inches | 27.5 11/4 1230 0.25 | 27.5 11/4 1230 0.25 | 27.5 11/4 1230 0.25 | 27.5 11/4 1230 0.25 |
R | Manifold length, feet Manifold diameter, inchesc | 30 2 | 30 2 | 30 2 | 30 2 |
W | Mound width, feet | 57 | 61 | 61 | 61 |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 gallon = 3.785 L.
- Additional width to obtain required basal area.
- Last hole is located at the end of the distribution pipe, which is 15 inches from the previous hole.
- Diameter dependent on the size of pipe from pump and inlet position.
DESIGN PARAMETER | PERCOLATION RATE (minutes per inch) SLOPE (percent) | |||||||
3 to 60 | 3 to less than 30 | |||||||
0 | 2 | 4 | 6 | 8 | 10a | 12a | ||
A | Bed width, feetb | 10 | 10 | 10 | 10 | 10 | 10 | 10 |
B | Bed length, feet | 13 | 13 | 13 | 13 | 13 | 13 | 13 |
D | Mound height, inches | 24 | 24 | 24 | 24 | 24 | 24 | 24 |
E | Mound height, inches | 24 | 26 | 29 | 31 | 34 | 36 | 38 |
F | Mound height, inches | 9 | 9 | 9 | 9 | 9 | 9 | 9 |
G | Mound height, inches | 12 | 12 | 12 | 12 | 12 | 12 | 12 |
H | Mound height, inches | 18 | 18 | 18 | 18 | 18 | 18 | 18 |
I | Mound width, feet | 12 | 13 | 14 | 17 | 18 | 21 | 26 |
J | Mound width, feet | 12 | 11 | 10 | 10 | 9 | 9 | 9 |
K | Mound length, feet | 12 | 12 | 12 | 13 | 13 | 13 | 15 |
L | Mound length, feet | 37 | 37 | 37 | 39 | 39 | 39 | 43 |
P | Distribution 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 |
R | Manifold length, feet Manifold diameter, inchesc | 6 2 | 6 2 | 6 2 | 6 2 | 6 2 | 6 2 | 6 2 |
S | Distribution pipe spacing, feet Number of holes per distribution piped Hole spacing, inchesdHole diameter, inches | 3 6 300.25 | 3 6 300.25 | 3 6 300.25 | 3 6 300.25 | 3 6 300.25 | 3 6 300.25 | 3 6 300.25 |
W | Mound width, feet | 34 | 34 | 34 | 37 | 37 | 41 | 45 |
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.
- 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).
- Bed widths shall not be limited.
- Use a manifold with distribution pipes on only one side.
- Last hole is located at the end of the distribution pipe, which is 15 inches from the previous hole.
DESIGN PARAMETER | PERCOLATION RATE (minutes per inch) SLOPE (percent) | |||||||
3 to 60 | 3 to less than 30 | |||||||
0 | 2 | 4 | 6 | 8 | 10a | 12a | ||
A | Bed width, feetb | 10 | 10 | 10 | 10 | 10 | 10 | 10 |
B | Bed length, feet | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
D | Mound height, inches | 24 | 24 | 24 | 24 | 24 | 24 | 24 |
E | Mound height, inches | 24 | 26 | 29 | 31 | 34 | 36 | 38 |
F | Mound height, inches | 9 | 9 | 9 | 9 | 9 | 9 | 9 |
G | Mound height, inches | 12 | 12 | 12 | 12 | 12 | 12 | 12 |
H | Mound height, inches | 18 | 18 | 18 | 18 | 18 | 18 | 18 |
I | Mound width, feet | 12 | 13 | 14 | 17 | 18 | 21 | 26 |
J | Mound width, feet | 12 | 11 | 10 | 10 | 9 | 9 | 9 |
K | Mound length, feet | 12 | 12 | 12 | 13 | 13 | 13 | 15 |
L | Mound length, feet | 49 | 49 | 49 | 51 | 51 | 51 | 55 |
P | Distribution 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 |
R | Manifold length, feet Manifold diameter, inches | 6 2 | 6 2 | 6 2 | 6 2 | 6 2 | 6 2 | 6 2 |
S | Distribution pipe spacing, feet Number of holes per distribution piped Hole spacing, inchesdHole diameter, inches | 3 5 300.25 | 3 5 300.25 | 3 5 300.25 | 3 5 300.25 | 3 5 300.25 | 3 5 300.25 | 3 5 300.25 |
W | Mound width, feet | 34 | 34 | 34 | 37 | 37 | 41 | 45 |
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.
- 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).
- Bed widths shall not be limited.
- 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.
- Last hole is located 9 inches from the end of the distribution pipe.
DESIGN PARAMETER | PERCOLATION RATE (minutes per inch) SLOPE (percent) | |||||||
3 to 60 | 3 to less than 30 | |||||||
0 | 2 | 4 | 6 | 8 | 10a | 12a | ||
A | Bed width, feetb | 10 | 10 | 10 | 10 | 10 | 10 | 10 |
B | Bed length, feet | 38 | 38 | 38 | 38 | 38 | 38 | 38 |
D | Mound height, inches | 24 | 24 | 24 | 24 | 24 | 24 | 24 |
E | Mound height, inches | 24 | 26 | 29 | 31 | 34 | 36 | 38 |
F | Mound height, inches | 9 | 9 | 9 | 9 | 9 | 9 | 9 |
G | Mound height, inches | 12 | 12 | 12 | 12 | 12 | 12 | 12 |
H | Mound height, inches | 18 | 18 | 18 | 18 | 18 | 18 | 18 |
I | Mound width, feet | 12 | 13 | 14 | 17 | 18 | 21 | 26 |
J | Mound width, feet | 12 | 11 | 10 | 10 | 9 | 9 | 9 |
K | Mound length, feet | 12 | 12 | 12 | 13 | 13 | 13 | 15 |
L | Mound length, feet | 62 | 62 | 62 | 64 | 64 | 64 | 68 |
P | Distribution 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 |
R | Manifold length, feet Manifold diameter, inches | 6 2 | 6 2 | 6 2 | 6 2 | 6 2 | 6 2 | 6 2 |
S | Distribution pipe spacing, feet Number of holes per distribution piped Hole spacing, inchesdHole diameter, inches | 3 8 300.25 | 3 8 300.25 | 3 8 300.25 | 3 8 300.25 | 3 8 300.25 | 3 8 300.25 | 3 8 300.25 |
W | Mound width, feet | 34 | 34 | 34 | 37 | 37 | 41 | 45 |
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.
- 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).
- Bed widths shall not be limited.
- Use a manifold with distribution pipes on only one side.
- Last hole is located at the end of the distribution pipe, which is 27 inches from the previous hole.
DESIGN PARAMETER | PERCOLATION RATE (minutes per inch) SLOPE (percent) | |||||||
3 to 60 | 3 to less than 30 | |||||||
0 | 2 | 4 | 6 | 8 | 10a | 12a | ||
A | Bed width, feetb | 10 | 10 | 10 | 10 | 10 | 10 | 10 |
B | Bed length, feet | 50 | 50 | 50 | 50 | 50 | 50 | 50 |
D | Mound height, inches | 24 | 24 | 24 | 24 | 24 | 24 | 24 |
E | Mound height, inches | 24 | 26 | 29 | 31 | 34 | 36 | 38 |
F | Mound height, inches | 9 | 9 | 9 | 9 | 9 | 9 | 9 |
G | Mound height, inches | 12 | 12 | 12 | 12 | 12 | 12 | 12 |
H | Mound height, inches | 18 | 18 | 18 | 18 | 18 | 18 | 18 |
I | Mound width, feet | 12 | 13 | 14 | 17 | 18 | 21 | 26 |
J | Mound width, feet | 12 | 11 | 10 | 10 | 9 | 9 | 9 |
K | Mound length, feet | 12 | 12 | 12 | 13 | 13 | 13 | 15 |
L | Mound length, feet | 74 | 74 | 74 | 76 | 76 | 76 | 78 |
P | Distribution 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 |
R | Manifold length, feet Manifold diameter, inches | 6 2 | 6 2 | 6 2 | 6 2 | 6 2 | 6 2 | 6 2 |
S | Distribution pipe spacing, feet Number of holes per distribution piped Hole spacing, inchesdHole diameter, inches | 3 10 300.25 | 3 10 300.25 | 3 10 300.25 | 3 10 300.25 | 3 10 300.25 | 3 10 300.25 | 3 10 300.25 |
W | Mound width, feet | 34 | 34 | 34 | 37 | 37 | 41 | 45 |
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.
- 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).
- Bed widths shall not be limited.
- Use a manifold with distribution pipes on only one side.
- Last hole is located 9 inches from the end of the distribution pipe.
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 PARAMETER | PERCOLATION RATE (minutes per inch) SLOPE (percent) | |||||||
0 to 60 | 0 to less than 30 | |||||||
0 | 2 | 4 | 6 | 8 | 10 | 12 | ||
A | Bed width, feet | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
B | Bed length, feet | 32 | 32 | 32 | 32 | 32 | 32 | 32 |
D | Mound height, inches | 12 | 12 | 12 | 12 | 12 | 12 | 12 |
E | Mound height, inches | 12 | 13 | 14 | 14 | 16 | 17 | 18 |
F | Mound height, inches | 9 | 9 | 9 | 9 | 9 | 9 | 9 |
G | Mound height, inches | 12 | 12 | 12 | 12 | 12 | 12 | 12 |
H | Mound height, inches | 18 | 18 | 18 | 18 | 18 | 18 | 18 |
I | Mound width, feet | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
J | Mound width, feet | 9 | 9 | 8 | 8 | 7 | 7 | 6 |
K | Mound length, feet | 10 | 10 | 10 | 10 | 10 | 11 | 11 |
L | Mound length, feet | 52 | 52 | 52 | 52 | 52 | 53 | 53 |
P | Distribution pipe length Distribution pipe diameter, inches Number of distribution pipesNumber of holes per distribution pipea Hole spacing, inchesaHole diameter, inches | 15.5 1 27 300.25 | 15.5 1 27 300.25 | 15.5 1 27 300.25 | 15.5 1 27 300.25 | 15.5 1 27 300.25 | 15.5 1 27 300.25 | 15.5 1 27 300.25 |
W | Mound width, feet | 22 | 23 | 23 | 24 | 24 | 25 | 25 |
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.
- Last hole is located at the end of the distribution pipe, which is 21 inches from the previous hole.
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 PARAMETER | PERCOLATION RATE (minutes per inch) SLOPE (percent) | |||||||
0 to 60 | 0 to less than 30 | |||||||
0 | 2 | 4 | 6 | 8 | 10 | 12 | ||
A | Bed width, feet | 6 | 6 | 6 | 6 | 6 | 6 | 6 |
B | Bed length, feet | 42 | 42 | 42 | 42 | 42 | 42 | 42 |
D | Mound height, inches | 12 | 12 | 12 | 12 | 12 | 12 | 12 |
E | Mound height, inches | 12 | 13 | 14 | 17 | 18 | 19 | 22 |
F | Mound height, inches | 9 | 9 | 9 | 9 | 9 | 9 | 9 |
G | Mound height, inches | 12 | 12 | 12 | 12 | 12 | 12 | 12 |
H | Mound height, inches | 18 | 18 | 18 | 18 | 18 | 18 | 18 |
I | Mound width, feet | 9 | 10 | 11 | 12 | 13 | 15 | 16 |
J | Mound width, feet | 9 | 9 | 8 | 8 | 7 | 7 | 6 |
K | Mound length, feet | 10 | 10 | 10 | 10 | 10 | 11 | 11 |
L | Mound length, feet | 62 | 62 | 62 | 62 | 62 | 64 | 64 |
P | Distribution 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 |
R | Manifold length, feet Manifold diameter, inches | 3 2 | 3 2 | 3 2 | 3 2 | 3 2 | 3 2 | 3 2 |
S | Distribution pipe spacing, feet Number of holes per distribution pipeb Hole spacing, inchesbHole diameter, inches | 3 9 300.25 | 3 9 300.25 | 3 9 300.25 | 3 9 300.25 | 3 9 300.25 | 3 9 300.25 | 3 9 300.25 |
W | Mound width, feet | 24 | 25 | 25 | 26 | 26 | 28 | 29 |
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.
- Use a manifold with distribution pipes only on one side.
- Last hole is located at the end of the distribution pipe, which is 15 inches from the previous hole.
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 PARAMETER | PERCOLATION RATE (minutes per inch) SLOPE (percent) | |||||||
0 to 60 | 0 to less than 30 | |||||||
0 | 2 | 4 | 6 | 8 | 10 | 12 | ||
A | Bed width, feet | 8 | 8 | 8 | 8 | 8 | 8 | 8 |
B | Bed length, feet | 47 | 47 | 47 | 47 | 47 | 47 | 47 |
D | Mound height, inches | 12 | 12 | 12 | 12 | 12 | 12 | 12 |
E | Mound height, inches | 12 | 12 | 16 | 18 | 19 | 22 | 24 |
F | Mound height, inches | 9 | 9 | 9 | 9 | 9 | 9 | 9 |
G | Mound height, inches | 12 | 12 | 12 | 12 | 12 | 12 | 12 |
H | Mound height, inches | 18 | 18 | 18 | 18 | 18 | 18 | 18 |
I | Mound width, feet | 9 | 11 | 12 | 13 | 15 | 17 | 18 |
J | Mound width, feet | 9 | 9 | 8 | 8 | 7 | 7 | 6 |
K | Mound length, feet | 10 | 10 | 10 | 10 | 10 | 11 | 12 |
L | Mound length, feet | 67 | 67 | 67 | 67 | 69 | 69 | 71 |
P | Distribution 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 |
R | Manifold length, feet Manifold diameter, inches | 64 2 | 64 2 | 64 2 | 64 2 | 64 2 | 64 2 | 64 2 |
S | Distribution pipe spacing, feet Number of holes per distribution pipea Hole spacing, inchesaHole diameter, inches | 32 10 300.25 | 32 10 300.25 | 32 10 300.25 | 32 10 300.25 | 32 10 300.25 | 32 10 300.25 | 32 10 300.25 |
W | Mound width, feet | 26 | 28 | 28 | 29 | 30 | 32 | 32 |
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.
- Last hole is located at the end of the distribution pipe, which is 21 inches from the previous hole.
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 PARAMETER | PERCOLATION RATE (minutes per inch) SLOPE (percent) | |||||||
0 to 60 | 0 to less than 30 | |||||||
0 | 2 | 4 | 6 | 8 | 10 | 12 | ||
A | Bed width, feet | 10 | 10 | 10 | 10 | 10 | 10 | 10 |
B | Bed length, feet | 50 | 50 | 50 | 50 | 50 | 50 | 50 |
D | Mound height, inches | 12 | 12 | 12 | 12 | 12 | 12 | 12 |
E | Mound height, inches | 12 | 14 | 17 | 19 | 22 | 24 | 26 |
F | Mound height, inches | 9 | 9 | 9 | 9 | 9 | 9 | 9 |
G | Mound height, inches | 12 | 12 | 12 | 12 | 12 | 12 | 12 |
H | Mound height, inches | 18 | 18 | 18 | 18 | 18 | 18 | 18 |
I | Mound width, feet | 9 | 11 | 13 | 14 | 17 | 18 | 19 |
J | Mound width, feet | 9 | 9 | 8 | 8 | 7 | 7 | 6 |
K | Mound length, feet | 10 | 10 | 10 | 10 | 11 | 11 | 12 |
L | Mound length, feet | 70 | 70 | 70 | 70 | 72 | 72 | 74 |
P | Distribution 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 |
R | Manifold length, feet Manifold diameter, inches | 6 2 | 6 2 | 6 2 | 6 2 | 6 2 | 6 2 | 6 2 |
S | Distribution pipe spacing, feet Number of holes per distribution pipea Hole spacing, inchesaHole diameter, inches | 3 10 300.25 | 3 10 300.25 | 3 10 300.25 | 3 10 300.25 | 3 10 300.25 | 3 10 300.25 | 3 10 300.25 |
W | Mound width, feet | 28 | 29 | 31 | 32 | 34 | 35 | 36 |
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.
- Last hole is 9 inches from the end of the distribution pipe.
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