Attenuation & Water Management
An Introduction to Stormwater Management
Flooding
When rain falls onto greenfield sites it is either absorbed into the ground or flows as runoff to the nearest watercourse. Hard surface developments such as roads and roofed areas on greenfield sites makes the ground impermeable thereby increasing the surface water runoff to the surrounding outfalls or storm drains. Increased run-off coupled with changing climatic conditions can overload conventional Stormwater drainage systems and contribute to flash flooding.
Legislative Response
To minimise downstream flooding European water management legislation requires local authorities to install a Sustainable urban drainage system (SuDS) in all new developments. SuDS is defined by the Construction Industry Research and Information Association (CIRIA) as “a sequence of management practices and control structures designed to drain surface water in a more sustainable fashion than conventional techniques”.
Site Audit
A detailed site audit will determine the most suitable type of Stormwater management system required. It will dictate if a permeable or impermeable system is required and if it is acceptable to discharge run off into the local watercourse. The audit is carried out by a consultant engineer and includes an analysis of the following parameters: site topography, soil type and infiltration rate, local watercourse, winter water table level and local authority regulations. This audit will determine the infiltration and/or attenuation requirements for a given project.
Make JFC your Stormwater Management Consultant & Provider
Infiltration
This system disposes Stormwater through an infiltration process replenishing the natural water table. One of the key benefits of this system is natural biomass forms on the walls and floor of the tank and over time filters and breaks down micro pollutants and contaminants present in the Stormwater.
Attenuation
These systems control the rate at which water enters the watercourse or storm drain. Attenuation systems can either be permeable or impermeable. Impermeable systems store excess water in a holding tank and discharge all water to a storm drain or watercourse. Permeable systems discharge to both the ground and a watercourse/storm drain. A Hydro-valve is used to control the flow leaving the attenuation tank. See section on JFC Hydro-Valve for more detail.
The JFC HydroChamber System can be used in three different types of stormwater management systems
- Infiltration/Soak-away system
- Permeable Attenuation System
- Impermeable Attenuation System
This broadens the range of applications for which it can be used. A site audit will determine the most suitable system.
Design Services
- Customised stormwater management solutions in accordance with local authority legislation.
- Tank sizing and calculations.
- Detailed report (for planning permission)
- On site consultation
Supply and Installation Services
JFC offer a number of options when supplying and installing a Stormwater management system
- Supply and install
- Supply and supervise
- Supply only
JFC also offer a number of services to enhance the supply and installation of the stormwater management system.
- Full Design Service
- Stormwater Management Reports
- Excavation drawings
- AutoCAD Drawings
- Excel Calculators
- Design Manuals
- Installation Manuals
- WRc / BBA Certification
- Technical Presentations
- Local Authority Support
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