- [Narrator] Welcome to the HydroStor's Stormwater Chamber
installation video.
HydroStor chamber systems are a highly effective way
to maximize commercial land usage,
by providing underground stormwater storage and recharge.
Let's get started.
Upon delivery to the project site,
visually inspect the chambers and the end caps for damage,
and to ensure accurate quantities.
After inspection,
unload the pallets with a forklift
with a minimum of 72 inch forks.
Place pallets in an area that is flat,
free of debris,
and away from construction traffic
to avoid potential damage.
Chambers and end caps may remain on the pallets
until they're ready to be installed.
HydroStor chambers feature integrated handles,
to allow them to easily be moved and set in place.
To remove the chambers from the pallets,
carefully cut and remove the banding
from around the chambers.
With two people,
use the handles to lift the chambers off the pallet,
and carry them into place.
Warning, the chambers must not be removed
from the stack by pushing them off from one side.
Removing the chambers in this manner may result
in chamber damage, injuries,
or even death.
Due to the inherent hazards associated with excavation,
special precautions should be taken.
Obey all federal, state and local guidelines
for excavation safety.
Using the project plans,
excavate the chamber system bed
making sure to allow enough space for the entire system,
including the chambers, and manifolds.
Ensure you have a minimum of 12 inches of excavation
between the side walls and the chamber system.
A minimum of 6 inches for HS 180,
and 12 inches for the HS 31,
HS 75, and HS 290 between the side wall and the end caps.
A stable foundation is required for installation.
If water or unstable soils are present,
take appropriate measures to ensure
you have a stable foundation.
The method used to remedy the issue will depend
on your specific circumstance.
The design engineer should be consulted
to determine the appropriate method based
on the site conditions.
Once your excavation is deemed stable,
place a 4 to 6 ounce Aashto M288
plus 2 or 3 non-woven filter fabric on the bed bottom
as a separation layer.
When placing the fabric be sure to maintain
a 24 inch overlap at all seems
After the fabric has been laid out,
place a level base of 3/4 inch to 2 inch
clean crushed angular stone
over the entire excavated bottom.
The bedding should be a minimum of 9 inch for the HS 180,
and HS 290 chambers,
and a minimum of 6 inch for the HS 75 and HS 31 chambers.
Additional bedding stone may be necessary based
on the native soil conditions
and the burial depth of the chambers,
consult a Prinsco representative
for minimum recommendations.
Using a vibratory compactor,
compact the stone base to achieve a flat level surface.
If specified in the project plans,
a perimeter under drain may be laid in the stone bedding.
Be sure it is not installed under a chamber footing.
A manifold is used to distribute the stormwater
to the chamber rows.
A manifold system will typically consist
of Prinsco goldflo dual wall pipe,
fittings, and split band couplers
Using project plans,
layout a manifold system at this time,
to alleviate the potential for scour at the inlet locations,
lay a 15 foot wide strip
of an Aashto M288 class 1 woven stabilization geotextile,
along the entire length of the manifold mainline,
adequately covering the bedding beneath the inlet locations.
The fabric should extend a minimum of 12 inches
in front of the end caps.
Position the end caps of each row with the inlet pipes,
at the required locations and elevations,
pour an opening in the end cap,
the approximate outside diameter of the pipe,
and insert the inlet pipe.
The inlet pipe should penetrate 12 inches into the end cap,
repeat this process for each row.
Cover any voids on the end caps greater than 3/4 of an inch,
with a non-woven geotextile to prevent infiltration
of the backfill material position.
Position the chambers in line with the end caps,
noting their orientation.
The chambers are stamped with arrows,
showing the direction for installation.
The end caps will fit over the first rib of the chambers,
and should be fastened with a minimum of three screws
to keep the end caps from shifting
during the backfilling process.
The assembly of each row is achieved
by over topping the last rib of the initial chamber,
with the first rib of the succeeding chamber.
End caps should be used to terminate each row of chambers.
During the assembly process,
do not extend the chamber rows beyond the reach
of the backfill placed equipment.
Maintaining a minimum clear space between each row
is required for adequate structural support.
Clear space should be a minimum of 8.5 inches
for the HS 290,
6 inches for the HS 75 and HS 31,
and 5 inches for the HS 180.
A spacer is recommended to maintain the required spacing.
Considering chambers have open bottoms,
it is essential to utilize a pre-treatment system
to remove sediment and debris,
before the influent enters the chamber system.
Prinsco recommends pretreatment by using
either a Prinsco stormwater quality unit,
and or a chamber sediment row.
It is important to consider
the local water quality regulatory requirements,
and the expected influent contamination.
Inspection ports are not required,
however they may be installed to monitor the sediment,
and debris level within the system.
Using the project plans,
identify which chambers should be fitted
with inspection ports.
Using a hole saw,
cut out the opening at the appropriate location.
A rubber gasketed connection can be used
to connect schedule 40,
or SDR 35 PVC pipe and fittings to build
the inspection port.
For the HS 180 and HS 290 chambers,
a 4 inch vent or inspection port may be drilled
in the valley between the corrugations,
the HS 31 and HS 75 chambers are equipped
with one circular cutout point,
to accommodate a 4 inch diameter inspection port.
The backfill and chambers function together
as a structural system to support the soil overburden
and vehicular live loads,
therefore a proper backfill material selection
and placement is critical.
Backfill material used for embedment,
anchoring and surrounding areas,
should comprise of a 3/4 to 2 inch
clean crushed angular stone.
Placement of backfill material is best accomplished
by using the long reach of an excavator
or stone shooter conveyor system.
No construction equipment shall be situated
on top of the chamber system
without the minimum cover specified.
Compaction of the crushed stone
around the chambers is not required.
However, it is critical to ensure that the backfill
is adequately knifed in around the manifolds,
and between the chamber corrugations.
In order to prevent chamber shifting
and to maintain the appropriate row spacing,
carefully deposit the stone evenly
along the center line of the chamber,
allowing the stone depth between the rows to rise equally.
During this phase,
stone height between rows should differ
by more than 12 inches.
After the anchoring is complete,
stone placement may continue to surround the chambers
and around the perimeter.
The embedment backfill stone should fully encompass
the chambers and extend evenly from the chambers
to the side walls of the excavation.
After the required embedment backfill has been placed,
12 inches for the HS 180 and HS 290,
and 6 inches for the HS 75 and HS 31,
a small lightweight tracked dozer may be used
to finalize the grading of cover stone.
Equipment should run parallel
to the chamber rows at all times.
Wheel and roller loads are not allowed at this time.
After the embedment backfill has been evenly spread,
the entire top of the stone bed should be covered
with a layer of 4 to 6 ounce non-woven fabric,
overlapping sims a minimum of 24 inches.
Utilizing an excavator positioned next to the chamber rows,
the initial backfill can now be placed
over top of the fabric.
The initial backfill should
be a well graded granular material.
After a minimum of 24 inches for the HS 290,
and 18 inches for the HS 180,
HS 75, and HS 31 has been placed,
compaction of the backfill may begin.
It is recommended that the compaction equipment
travels parallel with rows.
After the initial backfill has been placed and compacted,
the final backfill may be placed to reach
the required ground elevation.
Measured from the top of the chambers
to the bottom of pavement,
chambers should have a minimum cover of 24 inches
for the HS 290,
and 18 inches for the HS 180,
HS 75, and HS 31,
for H 20 vehicle loading.
If pavement does not to be used,
the cover should be increased to a minimum 30 inches
of cover for the HS 290,
and 24 inches of for the HS 180,
HS 75 and HS 31 for vehicular loading.
If the chambers will experience loading
from construction equipment while the project
is still being constructed,
temporary fill may be placed
over the system during construction and removed
after the heavy equipment traffic is rerouted.
The maximum burial depth for all chambers is 8 feet.
Proper installation of your chamber system
is critical to ensure structural integrity,
and maximum service life.
This can be achieved by following the steps laid out
in this installation guide.
They were, easy handling with two people,
make sure to excavate adequate room
for the system and ensure you have a stable foundation.
Assemble chambers in the proper direction
as indicated by the arrows on the chamber.
Install pretreatment structure into a sediment row.
Backfill evenly to prevent chamber shifting.
Be sure to check the minimum and maximum cover heights.
For more information on the HydroStor chamber,
visit Prinsco.com/Hydrostor.