Call StormTech at
860.529.8188
or
888.892.2694
or visit our website at
www.stormtech.com
for technical and product information.
28
10.0 System Sizing
TABLE 10 - Storage Volume Per Chamber
Bare
Chamber
Storage
Chamber and Stone
Foundation Depth
in. (mm)
ft
3
(m
3
)
6 (150)
12 (300)
18 (450)
SC-160LP
6.85 (0.19)
15.0 (0.42)
17.9 (0.51)
20.9 (0.59)
SC-310
14.7 (0.4)
31.0 (0.9)
35.7 (1.0)
40.4 (1.1)
SC-740
45.9 (1.3)
74.9 (2.1)
81.7 (2.3)
88.4 (2.5)
ft
3
(m
3
)
9 (230)
12 (300)
18 (450)
DC-780
46.2 (1.3)
78.4 (2.2)
81.8 (2.3)
88.6 (2.5)
Note: Assumes 40% porosity for the stone plus the chamber volume.
TABLE 11 – Amount of Stone Per Chamber
eNGLISH tons (yd
3
)
Stone Foundation Depth
6”
12”
18”
SC-160LP
1.2 (0.9)
1.6 (1.2)
1.9 (1.4)
SC-310
2.1 (1.5)
2.7 (1.9)
3.4 (2.4)
SC-740
3.8 (2.8)
4.6 (3.3)
5.5 (3.9)
MeTRIC kg (m
3
)
150 mm
300 mm
450 mm
SC-160LP
1088 (0.7)
1452 (0.9)
1724 (1.0)
SC-310
1830 (1.1)
2490 (1.5)
2990 (1.8)
SC-740
3450 (2.1)
4170 (2.5)
4490 (3.0)
eNGLISH tons (yd
3
)
9”
12”
18”
DC-780
4.2 (3.0)
4.7 (3.3)
5.6 (3.9)
MeTRIC kg (m
3
)
230 mm
300 mm
450 mm
DC-780
3810 (2.3)
4264 (2.5)
5080 (3.0)
Note: Assumes 6” (150 mm) of stone above, and between chambers. For
SC-310, SC-740 and DC-780 Chambers only.
TABLE 12 – Volume of Excavation Per Chamber
Stone Foundation Depth yd
3
(m
3
)
6” (150 mm) 12” (300 mm) 18” (450 mm)
SC-160LP
1.5 (1.1)
1.8 (1.3)
2.1 (1.5)
SC-310
2.9 (2.2)
3.4 (2.6)
3.8 (2.9)
SC-740
5.5 (4.2)
6.2 (4.7)
6.8 (5.2)
9” (230 mm) 12” (300 mm) 18” (450 mm)
DC-780
5.9 (4.5)
6.3 (4.8)
6.9 (5.3)
Note: Assumes 6” (150 mm) of separation between chamber rows (no
spacing for the SC-160LP) and 18” (450 mm) of cover. The volume of
excavation will vary as the depth of the cover increases.
For quick calculations, refer to the Site Calculator on
StormTech’s website at
www.stormtech.com
.
10.1 SYSTEM SIZING
The following steps provide the calculations necessary
to size a system. If you need assistance determining
the number of chambers per row or customizing the
bed configuration to fit a specific site, call StormTech’s
Technical Services Department at
1-888-892-2694
.
1) Determine the amount of storage volume (V
S
)
required.
It is the design engineer’s sole responsibility to determine
the storage volume required by local codes.
2) Determine the number of chambers (C) required.
To calculate the number of chambers needed for
adequate storage, divide the storage volume (V
s
) by the
volume of the selected chamber, as follows:
C = V
s
/ Volume per Chamber
3) Determine the required bed size (S).
To find the size of the bed, multiply the number of
chambers needed (C) by either:
StormTech SC-160LP
bed area per chamber = 14.8 ft
2
(1.3 m
2
)
StormTech SC-310
bed area per chamber = 23.7 ft
2
(2.2 m
2
)
StormTech SC-740 / DC-780
bed area per chamber = 33.8 ft
2
(3.1 m
2
)
S = (C x bed area per chamber) +
[1 foot (0.3 m) x bed perimeter in feet (meters)]
NOTE: It is necessary to add one foot (0.3 m) around the perimeter of the bed
for end caps and working space.
4) Determine the amount of clean, crushed, angular
stone (Vst) required.
To calculate the total amount of clean, crushed, angular
stone required, multiply the number of chambers (C) by
the selected weight of stone from
Table 11
.
NOTE: Clean, crushed, angular stone is also required around the perimeter of
the system.
5) Determine the volume of excavation (Ex) required.
6) Determine the area of filter fabric (F) required.
Each additional foot of cover will add a volume of excavation of 1.3 yds
3
(1.0 m
3
) per SC-740 / DC-780, 0.9 yds3 (0.7 m3) per SC-310 chamber and
0.55 yds
3
(0.4m
3
) per SC-160LP chamber.
The bottom and sides of the bed and the top of the
embedment stone must be covered with ADS 601 (or
equal) a non-woven geotextile (filter fabric). The area
of the sidewalls must be calculated and a 2 foot (0.6
m) overlap must be included where two pieces of filter
fabric are placed side-by-side or end-to-end. Geotextiles
typically come in 15 foot (4.6 m) wide rolls.
7) Determine the number of end caps (E
c
) required.
Each row of chambers requires two end caps.
E
c
= number of rows x 2
Summary of Contents for StormTech DC-780
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