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Network Control and Dynamic Catchment Area Reduction Ultra low power and lightweight the Flapstopper automated flap valves, can be used to dynamically alter flow into or through the network/catchment area. Without the need for mains power, their easy retro-fit design and optional local control using rain gauges (distrometers) or remote control from the network using radio telemetry make them easy to install with substantial savings over the traditional sluice gate and penstock valves. The FlapstoppersTM can be supplied to fit a variety of sizes and profiles of sewers. They can be engineered to either totally close off a channel or to offer fixed or programmable attenuation of the flow. Unlike manual penstocks – the valves can self test and also be configured to auto report in the unlikely event of failure.

Dynamic Catchment Area Management

Key to the occurrence of flooding is the management of the legacy catchment area where SUDS (Sustainable Drainage Systems) have not been or could not be applied, http://www.grdp.org/netregs/102255.aspx . Such as in cities and towns with high density housing and industry, etc.

In addition to the above, many factory sites have "consented discharges" into sewers that generally arise due to the lack of on-site drainage capacity and/or the lack of purity of the run-off,

How it works: We believe that in-drain retro-fit apparatus such as the DrainstopperTM strategically located at key points within the drainage network can play an important part in reducing the risk of sewer flooding, CSO discharges and flooding in general.


In truth we don't often need to reduce the flow by massive amounts to have an impact on flooding. Flooding like every other event, follows a probability distribution curve and in many cases a reduction in the peak flow by as little as 5% can be enough to make a difference. Drainage systems by their nature have two capacities, one is the flow rate and the other is storage capacity. We take advantage of the storage capacity to temporarily hold back or to partially hold back flow by closing off the drains / sewers at strategic locations.

Retro Fit The FlapstopperTM system was designed for retro-fit and can be installed in just a few hours, Systems can be mains or battery powered and for combined sewers supplied to meet ATEX Zone 2 and Zone 1 requirements, and in some cases multiple valves can be operated from a single controller. Actuation can be by means of a flow/level switch, rain gauge or remote control and closure time from a few tens of seconds to a couple of minutes depending upon drain size.

Easy to Maintain The FlapstopperTM is also available with a slide in mounting frame that permits easy maintenance of the system from above ground eliminating the need for teams of confined space operators.


Groundwater Source Protection During a recent conference Veolia Water acknowledged that in the drought stressed S.E. England loose on average one valuable groundwater source each year to pollution. EIL believe that with the correct application and enforcement of containment technology many of these valuable sources could have been still working today. Products such as the Flapstopper costing just a few thousands of pounds to install can literally save millions of pounds of valuable water resource if used up stream of an extraction borehole or river. WARNING: The FloodstopperTM is not the answer when your house or business is left unattened. For 100% assurance you need to install an Environmental Innovations automatic DrainstopperTM system. The DrainstopperTM is pre-installed into the drain using a special suspension bracketR. The whole assembly is automatically inflated under the control of level sensors located in the drain which are automatically triggered once the water/sewage levels exceed a preset level via our pneumatic control panel. The DrainstopperTM solution may sound expensive and complex but often it is much cheaper than an insurance policy excess and certainly the cost of the damage or lost production if you simply do nothing!


Network Control and Dynamic Catchment Area Reduction