ADS StormTech News

March 2023

ADS construction site

The Government announced in January that it intends to implement Schedule 3 of the Flood and Water Management Act 2010 (FWMA) in England. This will accelerate the adoption of SuDS and enforce mandatory standards and statutory requirements for the planning, design, construction, and maintenance of SuDS assets.

Designers and installers will now need to understand how those standards apply to various types of above- and below-ground stormwater attenuation systems, and decide which is the optimum system for any specific installation. Whilst structural performance, material, design, manufacture, installation, and maintenance will all effect the integrity and durability of a proprietary below-ground attenuation system, without a 'golden thread' running through the process, optimal performance can be compromised. Whilst attenuation methods such as large diameter pipes and crates depend on the installation of ancillary treatment systems to achieve optimal performance, the ADS StormTech system can provide a more complete solution for below-ground SuDS.

Water Quality
There is generally no water quality treatment capability within crate or pipe systems. Additional sediment and pollution removal is normally required as part of the treatment train. This not only requires additional capital investment, often costing £000s per unit, there is a potential operational cost in terms of inspection and maintenance for each of the additional devices.

StormTech has a multi-stage in-built water quality treatment device called Isolator Row that is independently tested and validated to remove over 80% Total Suspended Solids (TSS). Often, this means that no additional sediment removal provision is required. It can also mean that additional treatment devices for the removal of metals and hydrocarbons are not required. Isolator Row can also mitigate against particulate Phosphorus and Nitrogen nutrient loading from stormwater runoff.

Find Out More

Advertisement PDF

StormTech's patented Isolator Row features in our current advertising campaign

Inspection and Maintenance
Crates and pipes risk a build-up of sediment, which could compromise storage volume. Section 21.5.3 of CIRIA C753 The SuDS Manual recommends that where there is a risk of sedimentation and where an attenuation system is hard to maintain, the hydraulic design volume should be oversized by 10%.

In contrast, Isolator Row is the only part of a StormTech system that requires cleaning, and the system will not require oversizing. Cleaning is carried out using standard sewer jetting equipment and a vacuum tanker, with cleaning intervals typically between 2-5 years, depending on the nature of the site.

Find Out More

Cover depth
Many StormTech chambers can be installed with as little as a 450mm minimum cover depth under roads with HGV loading. A recent Eurocode Modelling Study confirms that StormTech chambers are structurally adequate when installed to the standard minimum and maximum cover depths provided in the StormTech Construction Guides.

Find Out More

A simple solution
A consequence of Schedule 3 is designers and developers will need to think about more than just hydraulic performance. Whole life performance, adoption and water quality will become statutory requirements and an integral part of the solution, and whilst there may be a transition period before Schedule 3 is fully implemented, it makes sense for designers to upskill now to future-proof current projects. And here's where ADS can help. Our CPD programme covers SuDS best practice, information on legislation, ADS StormTech and alternative below-ground systems. To book a CPD seminar, simply click here or call 0203 442 0607.


StormTech is manufactured by ADS, America's largest manufacturer of thermoplastic corrugated drainage pipes and a specialist in water management systems. StormTech has a long and successful track record with over 50,000 system installations using in excess of 3 million units.

To book a CPD seminar or to contact ADS UK call
0203 442 0607 or click here

StormTech News brings you regular updates on issues affecting drainage and water management in the UK. We deem this email to be of legitimate interest to you and your data is in the public domain or has been provided to us by Glenigan or another source compliant with data protection legislation. If you unsubscribe, you will not receive emails of this kind again. To read our UK Privacy Policy, please click here or to unsubscribe from this email, please click on the link below: