Precast Concrete Stormwater Management Systems
Omega Underground Infiltration System
Structures are designed to support HS-20 wheel loads with as little as 6" of earth cover from wearing surface to top of structure. Internal spans are 14', 16' or 18' and internal heights range from 4'-0" to 12'-0" at 2' intervals.
The RES Omega Underground Infiltration system is a large span structure used mainly for infiltrating water below clay layers in the soil. Larger spans of 14', 16' and 18' reduce the number of sections needed to construct a large system thus reducing the time to fabricate, install and the cost of the system. The precast sections come with a monolithically cast T-shaped footing on each leg that supports the loading on the structure while providing a large open floor area that allows water to infiltrate into the soil. Precast internal outlet control structures control the flow of water from the system.
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Systems may consist of multiple barrels to fit within restricted areas. Equalization pipes are used to connect separate barrels.
Sections come with monolithically cast foundations on the bottom of each sidewall. This allows the bottom floor area to remain a stone bed allowing water to infiltrate the ground. No field-cast foundations required.
Systems come with internal precast weir walls customized with special orifices, weirs and heights to control the flow of water from the structure.
Precast sections come with pipe openings cast-in. They also come with cast-in access openings and manhole steps. Access openings range from 24" diameter to 48"x48" hatch opening.
Precast outlet control structures can be customized to control the water flow.
The exterior joints between precast sections are sealed with an exterior joint wrap.
Precast sections come to the jobsite one section per delivery truck.
Rotation of Tall Sections
Precast sections with an inside height larger than 8' need to shipped on their side due to height restrictions. These sections need to be rotated on site prior to installation.
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