Call StormTech at
860.529.8188
or
888.892.2694
or visit our website at
www.stormtech.com
for technical and product information.
3
2.0 Product Information
2.1 PRODUCT APPLICATIONS
StormTech chamber systems may function as stormwater
detention, retention, first-flush storage, or some
combination of these. The StormTech chambers can be
used for commercial, municipal, industrial, recreational,
and residential applications especially for installations
under parking lots and commercial roadways.
One of the key advantages of the StormTech chamber
system is its design flexibility. Chambers may be
configured into beds or trenches of various sizes or
shapes. They can be centralized or decentralized, and fit
on nearly all sites. Chamber lengths enhance the ability to
develop on both existing and pre-developed projects. The
systems can be designed easily and efficiently around
utilities, natural or man-made structures and any other
limiting boundaries.
2.2 CHAMBERS FOR STORMWATER DETENTION
Chamber systems have been used effectively for storm
water detention for over 15 years. A detention system
temporarily holds water while it is released at a defined
rate through an outlet. While some infiltration may
occur in a detention system, it is often considered an
environmental benefit and a storage safety factor. Over
70% of StormTech’s installations are non-watertight
detention systems. There are only a few uncommon
situations where a detention system might need to
limit infiltration: the subgrade soil’s bearing capacity is
significantly affected by saturation such as with expansive
clays or karst soils, and; in sensitive aquifer areas where
the depth to groundwater does not meet local guidelines.
Adequate pretreatment could eliminate concerns for the
latter case. A thermoplastic liner may be considered for
both situations to limit infiltration.
2.3 STONE POROSITY ASSUMPTION
A StormTech chamber system requires the application
of clean, crushed, angular stone below, between and
above the chambers. This stone serves as a structural
component while allowing conveyance and storage of
stormwater. Storage volume examples throughout this
Design Manual are calculated with an assumption that
the stone has an industry standard porosity of 40%.
Actual stone porosity may vary. Contact StormTech for
information on calculating storm water volumes with
varying stone porosity assumptions.
2.4 CHAMBER SELECTION
Primary considerations when selecting between the SC-
160LP, SC-310, SC-740 and DC-780 chambers are the
depth to restrictive layer, available area for subsurface
storage, cover height and outfall restrictions.
The StormTech SC-160LP chamber shown on page
4 is the smallest of the chamber family and has been
optimized to fit in the shallowest of applications. This
extra low profile chamber allows for storage of 1.01 ft
3
/ft
2
(0.3m
3
/m
2
) [minimum] of storage.
The SC-310 and SC-740 chambers and end plates.
StormTech systems can be integrated into retrofit and
new construction projects.
The StormTech SC-310 chamber shown on page 6 is ideal
for systems requiring low-rise and wide-span solutions.
This low profile chamber allows the storage of large
volumes, 1.3 ft
3
/ft
2
(0.40 m
3
/m
2
) [minimum], at minimum
depths.
Like the Stormtech SC-310, the StormTech SC-310-
3 found on page 8 allows for a design option for sites
with both limited cover and limited space. With only 3”
of spacing between the chambers, the SC-310-3 still
provides 1.3 ft
3
/ft
2
(0.40 m
3
/m
2
) [minimum] of storage.
The StormTech SC-740 chamber shown on page 10
optimizes storage volumes in relatively small footprints.
By providing 2.2 ft
3
/ft
2
(0.67 m
3
/m
2
) [minimum] of storage,
the SC-740 chambers can minimize excavation, backfill
and associated costs.
The DC-780 chamber shown on page 12 has been
developed for those applications which exceed the
maximum 8 ft (2.44 m) burial depth of the SC-740 and SC-
310 chambers. The DC-780 is a modified version of the
SC-740 allowing it to reach a maximum burial depth of 12
ft (3.66 m). The design of the DC-780 chamber, like other
StormTech chambers, is designed and manufactured
in accordance with the AASHTO LRFD Bridge Design
Specifications as well as ASTM F 2418 and ASTM F 2787
ensuring structural adequacy for deeper systems.
The end corrugations of the DC-780 chamber have not
been modified in order to allow connections to the SC-740
chamber. This will allow hybrid systems utilizing both
chambers in one system design.
Summary of Contents for StormTech DC-780
Page 2: ...An company TOOL 2 0 DESIGN ...
Page 39: ......
