Stormwater Attenuation Lagoon

Stormwater Attenuation Lagoon

A safe and cost-effective way to prevent flooding

We supply a wide range of compliant geomembrane liners specifically designed for the creation of stormwater attenuation lagoons.

Dependent on your needs, we can supply the geomembrane only or provide you with a complete package. This includes supply, design and construction of the lagoon. Our installation team has over 25 years of experience in rural construction and are ISO:9001 and ISO:14001 compliant.

Contact our team of specialists for expert advice on 0121 351 3230.

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What is a stormwater attenuation lagoon?

Stormwater attenuation lagoons are used to control the flow of stormwater runoff. Also known as detention basins, retention ponds, retarding ponds, dry ponds or holding ponds, these lagoons are man-made.

Detention basins are surface storage basins or facilities that provide flow control through attenuation of stormwater runoff. They also facilitate some settling of particulate pollutants.

Detention basins are normally dry and in certain situations, the land may also function as a recreational facility. However, basins can also be mixed, including both a permanently wet area for wildlife or treatment of the runoff and an area that is usually dry to cater for flood attenuation.

Basins tend to be found towards the end of the SuDS management train, so are used if extended treatment of the runoff is required or if they are required for wildlife or landscape reasons.

How does a detention basin work?

A detention basin (stormwater attenuation lagoon) prevents flooding by controlling the amount of stormwater that is released into the environment at any given time. When a storm event occurs, the detention pond simply fills up and stores large volumes of rainwater temporarily. It will then gradually release this water, thereby reducing flooding and erosion downstream.

What is the difference between a detention and retention basin?

In contrast to dry detention ponds, retention ponds will hold a permanent pool of water and can also be referred to as wet ponds. A retention pond is usually created because of a high groundwater table (the groundwater is near the surface of the earth).

How are stormwater attenuation lagoons created?

These basins are typically created during the construction of new building development projects, such as housing estates or shopping centres. They are a best practice method of preventing general flooding and controlling extreme floods, such as a 1 in a 100-year storm event. The basins help control excess urban runoff, which is created as a result of man-made impervious surfaces such as rooftops, roads etc.

The lagoons are created by excavating an area of land and lining it with a permeable geomembrane. There will generally be a small opening at the lowest point of the structure. The size of this opening is determined by the capacity of underground and downstream culverts and washes to handle the release of the contained water.

What geomembranes do we supply?

We can supply and install geomembrane liners and waterproof lining systems for reservoirs, lakes, ponds, canals and lagoons. By understanding your requirements we can quickly identify the best lining solution for your specific project. We provide a full 360-degree service that includes detailed design, full installation and inspection.

Our high quality, CE marked range of waterproof lining products includes: Landflex PEHD (HDPE), Landflex PELL (LLDPE), Landflex BR (Butyl Rubber), Landflex EP (EPDM Rubber). Our Landflex G3000, G4000 and G6200 CBR puncture resistant liner protection geotextile are designed to complement the range, providing excellent protection against damage to our liners.

Do we install stormwater lagoons?

We can supply the geomembrane only or provide you with a complete package. This includes supply, design and also install your lagoon for you. Our installation team has over 25 years of experience in rural construction and are ISO:9001, ISO:14001, Achilles and ConstructionLine accredited.

To find out more, contact our specialist at Cotterill Civils for expert advice on stormwater lagoons on 0121 351 3230.

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Interested to know more?

Speak to our Stormwater Attenuation Lagoon experts to make sure you get the most efficient solution for your needs

Why choose our stormwater attenuation lagoons?

High strength & durability

Our geomembranes are designed to be strong and durable to ensure they last.

Puncture resistant

Our geomembranes are designed to have a high resistance to punctures, prevent root growth and other items puncturing the membrane and causing leakages.

Withstands heat/cold weather fluctuations

Our membranes are designed to withstand all fluctuations in weather.

Installation available

We can supply the membrane only or deliver a 360-service service where we can supply, design and install your attenuation lagoon for you.

Interested to know more?

Speak to our Stormwater Attenuation Lagoon experts to make sure you get the most efficient solution for your needs

What is a stormwater attenuation lagoon?

The management of stormwater is becoming increasingly important as a means to control flooding and prevent pollutants from entering our waterways. All new building developments now need to ensure they install compliant stormwater attenuation systems.

Stormwater attenuation lagoons are seen as a best-practice method of controlling the flow of stormwater runoff. Also known as detention basins, retention ponds, retarding ponds, dry ponds or holding ponds, these lagoons are man-made.

They are designed to prevent flooding by controlling the amount of stormwater that is released into the environment at any given time. When a storm event occurs, the lagoons fill up and store large volumes of rainwater temporarily. This water is then gradually released, reducing flooding and erosion downstream.

Our range of geomembranes

We can supply and install geomembrane liners and waterproof lining systems for reservoirs, lakes, ponds, canals and lagoons. We can quickly identify the best lining solution for your specific project. We provide a full 360-degree service that includes detailed design, full installation and inspection.

Our high quality, CE marked range of waterproof lining products include Landflex PEHD (HDPE), Landflex PELL (LLDPE), Landflex BR (Butyl Rubber) and Landflex EP (EPDM Rubber). Our Landflex G3000, G4000 and G6200 CBR puncture resistant liner protection geotextiles are designed to complement the range, providing excellent protection against damage to our liners.

Interested to know more?

Speak to our Stormwater Attenuation Lagoon experts to make sure you get the most efficient solution for your needs

Our installation service

We can supply the membrane only or provide you with a complete 360-service. This includes the design, supply and complete construction of your lagoon.

At Cotterill Civils, we have over 25 years of experience in rural construction and have extensive experience in constructing lagoons for our customers.

From start to finish, we will work with you to advise on the best, most practical, economical and compliant solution. You can also rest assured that you are dealing with professionals –  we are ISO 9001, ISO 14001, Achilles and Constructionline accredited.

CASE STUDY

Construction of a detention lagoon for Aston Villa’s new training ground

O’Brien Contractors, the multi-award-winning civil engineering and groundwork contractor, had been appointed to work on the latest phase of Aston Villa’s new training ground. As part of this work, they needed a solution to prevent excess stormwater from potentially flooding the site.

They contacted us in regards to a stormwater attenuation solution for this project. From undertaking a detailed analysis of their needs, the plans and the site, we agreed upon the installation of a detention basin. It was agreed that we would install as well as supply the detention basin by creating an attenuation lagoon.

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Interested to know more?

Speak to our Stormwater Attenuation Lagoon experts to make sure you get the most efficient solution for your needs