Treatment Catch Basin

Treatment and Settling Catch Basin for Stormwater. An HDPE catch basin designed to collect stormwater runoff, settle sediments and retain floating debris before they spread through the storm sewer network.

The Soleno treatment catch basin is designed to collect surface runoff while helping control sediments, debris and floating pollutants before they enter the storm sewer network. Installed at the source, it combines stormwater collection, sediment settling and floating debris retention in a compact HDPE structure.

This solution can replace a standard catch basin when a project requires a stormwater pretreatment function directly at the collection point. Lightweight, durable and resistant to demanding underground conditions, the treatment catch basin is well suited for municipal, commercial, institutional and urban drainage projects where runoff quality is a concern.

Operation:

Step 1: during rainfall events, surface runoff carries sediments and floating debris. Collection systems direct water to the storm water sewer system.
Step 2: a portion of the suspended sediments is deposited at the bottom of the catch basin.
Step 3: because of its permanently submerged water intake, the treatment catch basin ensures retention and accumulation of floating pollutants.
Step 4: the treatment catch basin acts directly at the source to prevent pollutants dispersing through the whole storm water sewer network.

Technical documents

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Advantages and Benefits

Can easily replace any of the standard catch basins from our collecting solutions, helping to further control the quality of surface runoff in urban areas.
Is an economical solution for the upstream treatment of some types of pollutants.
Can be easily adapted to all types of pipe while maintaining network watertightness.
Withstands CL-625, H-25 and HS-25 loads.
Is easy to install on site, as it is much lighter than traditional catch basins.
Eliminates the need for frost-resistant geocomposite.
Provides excellent resistance to de-icing salts, abrasives, chemicals and vibration, as it is made from HDPE.

Technical Documents

Data Sheet

Data Sheet – Treatment Catch Basin

pdf

Specifications

Specs – Treatment Catch Basin

pdf

Why Choose a Treatment Catch Basin?

A source-control solution for stormwater pretreatment

The treatment catch basin helps improve stormwater management by acting directly at the collection point. Instead of only conveying runoff toward the storm sewer network, it adds a pretreatment function by allowing sediments to settle and floating debris to be retained inside the structure.

This source-control approach is especially useful in urban areas, parking lots, paved surfaces and sites where surface runoff may carry sediments, debris or floating pollutants. By retaining part of this material upstream, the treatment catch basin can help reduce the load reaching downstream infrastructure.

Made from HDPE, the treatment catch basin is lightweight, durable and resistant to demanding underground conditions. It can be adapted to different pipe materials while helping maintain network watertightness, making it a practical option for projects that require both stormwater collection and pretreatment.

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Common Applications

Storm Sewer Networks

The treatment catch basin can be integrated into storm sewer networks to collect surface runoff while helping retain sediments and floating debris before they spread downstream. It is a practical option when stormwater quality must be considered directly at the collection point.

Parking Areas and Paved Surfaces

Parking lots, streets and paved areas can generate runoff carrying sediments, debris and floating pollutants. The treatment catch basin allows pretreatment to occur at the source, where runoff is first collected.

Municipal and Urban Drainage Projects

The treatment catch basin is well suited for municipal and urban projects where surface runoff quality is an important design consideration. It can replace a standard catch basin when a settling and floating debris retention function is required.

Commercial, Institutional and Industrial Sites

For sites where runoff may carry a higher sediment or debris load, the treatment catch basin can provide localized stormwater pretreatment before water is directed toward the storm sewer network, a retention system or another treatment solution.

Treatment Catch Basin or Pretreatment Unit?

Understanding the difference to choose the right solution for your project

The treatment catch basin is a source-control stormwater collection solution that contributes to sediment settling and the retention of floating pollutants within a compact structure. It is especially useful when the objective is to add a pretreatment function directly at a catchment point.

For higher treatment requirements, greater flow rates or more advanced separation performance, a dedicated pretreatment unit may be recommended. The right choice depends on the project objectives, site conditions and applicable regulatory requirements.

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Validate the Right Stormwater Treatment Solution for Your Project

Planning a stormwater drainage or runoff quality project? Our team can help you determine whether the treatment catch basin meets your needs for stormwater collection, sediment settling and source-control pretreatment.

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FAQ - Frequently Asked Questions about Treatment Catch Basin

What is a treatment catch basin?

A treatment catch basin is a stormwater collection structure designed to retain part of the sediments, debris and floating pollutants carried by surface runoff before they spread through the storm sewer network. Unlike a standard catch basin, it includes a source-control pretreatment function.

How does a treatment catch basin work?

During rainfall events, runoff enters the catch basin carrying sediments and floating debris. A portion of suspended solids settles at the bottom of the structure, while the submerged intake helps retain floating pollutants. The water is then conveyed toward the storm sewer network or downstream infrastructure.

What is the difference between a standard catch basin and a treatment catch basin?

A standard catch basin mainly collects surface runoff and directs it toward the storm sewer network. A treatment catch basin adds a settling and floating debris retention function, helping control pollutants earlier in the stormwater management chain.

What types of pollutants can be retained?

The treatment catch basin helps retain part of the sediments, fine particles, floating debris and floating pollutants carried by stormwater runoff. Performance depends on the basin diameter, height, retention volume, site conditions and maintenance frequency.

Where should a treatment catch basin be installed?

A treatment catch basin can be installed in storm sewer networks, parking areas, streets, commercial sites, municipal projects and urban areas where runoff may carry sediments or floating pollutants. It is especially useful upstream of a stormwater network, retention basin or additional treatment system.

Can a treatment catch basin replace a standard catch basin?

Yes. In some projects, the treatment catch basin can replace a standard catch basin when the objective is to add source-control pretreatment. It combines stormwater collection, sediment settling and floating debris retention in one structure.

Can the treatment catch basin connect to different pipe materials?

Yes. Soleno treatment catch basins can be adapted to common storm sewer pipe materials, including HDPE, PVC, concrete and CSP. The final connection should be validated based on pipe diameter, material, configuration and project requirements.

Is retention capacity always the same?

No. Retention capacity depends on the diameter and height of the unit. Larger catch basins can retain a higher volume of sediments and contaminants.

When should I choose a pretreatment unit instead?

A dedicated pretreatment unit may be recommended when the project requires higher treatment performance, larger flow capacity or more advanced separation. The choice between a treatment catch basin and a pretreatment unit depends on the project’s treatment objectives, flow conditions, site constraints and regulatory requirements.