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18
4.0 Foundations for Chambers
Cover
Hgt. ft.
(m)
Minimum Required Bearing Resistance for Service Loads ksf (kPa)
4.1
(196)
4.0
(192)
3.9
(187)
3.8
(182)
3.7
(177)
3.6
(172)
3.5
(168)
3.4
(163)
3.3
(158)
3.2
(153)
3.1
(148)
3.0
(144)
2.9
(139)
2.8
(134)
2.7
(129)
2.6
(124)
2.5
(120)
2.4
(115)
2.3
(110)
2.2
(105)
2.1
(101)
2.0
(96)
1.5
(0.46)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
9
(230)
9
(230)
9
(230)
9
(230)
9
(230)
12
(300)
12
(300)
12
(300)
15
(375)
15
(375)
2.0
(0.61)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
9
(230)
9
(230)
9
(230)
9
(230)
9
(230)
12
(300)
12
(300)
12
(300)
15
(375)
15
(375)
15
(375)
2.5
(0.76)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
9
(230)
9
(230)
9
(230)
9
(230)
9
(230)
12
(300)
12
(300)
12
(300)
15
(375)
15
(375)
15
(375)
18
(450)
3.0
(0.91)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
9
(230)
9
(230)
9
(230)
9
(230)
9
(230)
12
(300)
12
(300)
12
(300)
15
(375)
15
(375)
15
(375)
18
(450)
18
(450)
3.5
(1.07)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
9
(230)
9
(230)
9
(230)
9
(230)
9
(230)
12
(300)
12
(300)
12
(300)
12
(300)
15
(375)
15
(375)
18
(450)
18
(450)
21
(550)
4.0
(1.22)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
9
(230)
9
(230)
9
(230)
9
(230)
9
(230)
12
(300)
12
(300)
12
(300)
12
(300)
15
(375)
15
(375)
18
(450)
18
(450)
21
(550)
4.5
(1.37)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
9
(230)
9
(230)
9
(230)
9
(230)
9
(230)
12
(300)
12
(300)
12
(300)
12
(300)
15
(375)
15
(375)
18
(450)
18
(450)
21
(550)
5.0
(1.52)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
9
(230)
9
(230)
9
(230)
9
(230)
9
(230)
12
(300)
12
(300)
12
(300)
15
(375)
15
(375)
15
(375)
18
(450)
18
(450)
21
(550)
5.5
(1.68)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
9
(230)
9
(230)
9
(230)
9
(230)
9
(230)
12
(300)
12
(300)
12
(300)
12
(300)
15
(375)
15
(375)
15
(375)
18
(450)
18
(450)
21
(550)
6.0
(1.83)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
9
(230)
9
(230)
9
(230)
9
(230)
9
(230)
12
(300)
12
(300)
12
(300)
12
(300)
15
(375)
15
(375)
15
(375)
18
(450)
18
(450)
21
(550)
21
(550)
6.5
(1.98)
6
(150)
6
(150)
6
(150)
6
(150)
6
(150)
9
(230)
9
(230)
9
(230)
9
(230)
9
(230)
9
(230)
12
(300)
12
(300)
12
(300)
15
(375)
15
(375)
15
(375)
18
(450)
18
(450)
18
(450)
21
(550)
24
(600)
7.0
(2.13)
6
(150)
6
(150)
6
(150)
6
(150)
9
(230)
9
(230)
9
(230)
9
(230)
9
(230)
9
(230)
12
(300)
12
(300)
12
(300)
12
(300)
15
(375)
15
(375)
15
(375)
18
(450)
18
(450)
21
(550)
21
(550)
24
(600)
7.5
(2.30)
6
(150)
6
(150)
6
(150)
9
(230)
9
(230)
9
(230)
9
(230)
9
(230)
12
(300)
12
(300)
12
(300)
12
(300)
12
(300)
15
(375)
15
(375)
15
(375)
18
(450)
18
(450)
21
(550)
21
(550)
24
(600)
27
(675)
8.0
(2.44)
6
(150)
9
(230)
9
(230)
9
(230)
9
(230)
9
(230)
9
(230)
12
(300)
12
(300)
12
(300)
12
(300)
12
(300)
15
(375)
15
(375)
15
(375)
18
(450)
18
(450)
21
(550)
21
(550)
24
(600)
24
(600)
27
(675)
NOTE: The design engineer is solely responsible for assessing the bearing resistance (allowable bearing capacity) of the subgrade soils and
determining the depth of foundation stone. Subgrade bearing resistance should be assessed with consideration for the range of soil moisture
conditions expected under a stormwater system.
TABLE 2 - SC-310 and SC-740 Minimum Required Foundation Depth in inches (millimeters)
Summary of Contents for StormTech DC-780
Page 2: ...An company TOOL 2 0 DESIGN ...
Page 39: ......
