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StormGate™ High Flow Bypass Structure

High stormwater flows can reduce the effectiveness of water quality facilities by re-suspending sediments and flushing captured floatables. StormGate addresses this by only allowing flows up to the water quality design flow to enter the water quality facility and bypasses the flows greater than the design flow around the treatment facility.

Technical information for this product is centrally located in the technical guides section.

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StormGate Overview

The StormGate Stormwater High Flow Bypass Structure is a precast structure that addresses high-energy flows, in excess of design flows, that may occur on a site.

High flows can reduce the effectiveness of water quality facilities by re-suspending sediments and flushing captured floatables, causing a concentrated pulse of pollutants to be sent to downstream waterways.

StormGate only allows stormwater runoff flows up to the water quality design flow to enter the water quality facility and  bypass or re-direct the flows greater than the design flow around the stormwater treatment facility.

StormGate Benefits

  • Minimizes the occurrence of pulsing when installed upstream of water quality or pretreatment facilities
  • Directs the high flow away from upstream treatment system
  • Field-adjustable weir and orifice provide tighter control over system hydraulics than other high flow bypass methods

The Contech Advantage


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Agency/Regulatory Guidance

Our team is ready to provide you with expert advice and assistance on local regulatory requirements, resulting in faster approvals.

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Solution Development

Our engineers can review your requirements, weigh all options, and recommend the optimal solution to integrate with your site designs.

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Technical Expertise

Our engineers assist by providing product specific engineering calculations such as hydraulics, buoyancy, foundation reactions, and unit sizing.

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Cost Estimates

We can quickly provide engineer’s cost
estimates to assist with your solution
selection process.

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Site Specific Drawings

Our engineers can provide site-specific drawings for proposals, project meetings, and submittals, helping you be more efficient with your time.

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On-site Assistance

Contractors know time is money, so we provide preconstruction meetings, delivery coordination, and on-site installation support to ensure a timely, smooth installation.