Diameter of Sewer
(inches)
|
Absolute Maximum Manhole Spacing
(feet)
| |
---|---|---|
12 to 42
|
400
| |
48 to 60
|
500
| |
66 and larger
|
600
| |
NOTE: Height (rise) of arch and elliptical pipe
shall be used as the criteria for manhole spacing.
|
Pavement Type
|
MDOT Bituminous Mixture
| |
---|---|---|
Commercial and industrial roads
|
4C
| |
Residential streets
|
13
| |
Parking lots
|
36A
|
Sewer Size
(inches)
|
Minimum Slope
|
Maximum Slope
| |
---|---|---|---|
4
|
2.00%
|
6.5%
| |
6
|
1.00%
|
6.5%
| |
8
|
0.40%
|
5.0%
| |
10
|
0.30%
|
4.0%
| |
12
|
0.22%
|
3.0%
| |
15
|
0.15%
|
2.0%
| |
18
|
0.12%
|
1.5%
| |
21
|
0.10%
|
1.3%
| |
24
|
0.08%
|
1.2%
|