Articles & Case Studies

Flod alleviation at Much Wenlock

Posted: Friday 21st February 2020

Situation

The multi award-winning Much Wenlock flood alleviation scheme is a £2M project initiated by Shropshire Council to reduce flood risk to homes, businesses and highways in the small town of Much Wenlock.

Much Wenlock has a long history of flooding. The Shylte Brook and its tributaries run through the centre of the town and are largely culverted running underground. The culverts have a limited capacity and when they are full, the excess floodwater flows over ground through Much Wenlock thus affecting properties, businesses and infrastructure. In 2007 around 64 properties reported flooding to Shropshire Council and an electricity substation caused a power outage to a large part of the town due to the flooding.

Problem

Due to its history of flooding problems, Much Wenlock needed a flood prevention system and an early warning monitoring system.

The flood prevention system needed to be self-activating and require no power or moving parts to ensure that it would operate reliably.

The monitoring solution needed to be non-contact, require minimal or no maintenance, and be installed in an elevated position in order to prevent the risk of vandalism. With no existing power supply available at the site, ideally the system would need to have its own integral power.

Solution

Two sites were identified for the construction of flood alleviation ponds to store flood water upstream of Much Wenlock. One is on the Sytche Brook to the north west of the town and the other on the Shylte Brook to the south west.

Hydro International worked with consultants WSP to size and design the three Hydro-Brake® Flood vortex flow controls which are situated at the outlets of the ponds, restricting the water flow to within the downstream culvert capacities. Between them the two ponds have a water storage capacity of 21,104m3.

Following this initial phase, WSP asked Hydro International to recommend a suitable monitoring system to provide insight into water levels.

Hydro-Logic® Flexi Logger 100’s, paired with VEGA WL61 level sensors were chosen - a tried and tested combined solution that provides accurate and reliable real-time information and long-term data gathering. The Hydro International team worked with WSP and contractor Alun Griffiths to develop an effective installation method. One set was installed at each of the flood attenuation ponds.

Outcome

The completed scheme has reduced flood risk to 171 properties and highways and has also created a public open space and restored the local Westwood Quarry SSSI (Site of Special Scientific Interest) providing additional environmental and sustainability benefits.

Work started on the scheme in 2015 and won the Sustainability category in the Environment Agency’s annual Flood & Coast 2018 Project Excellence Awards. In March 2018, it also won the CIHT Sustainability Award and came highly commended in the 2018 BCI Awards for Small Project of the Year and the 2018 IHE Mercia Branch Awards in April 2018.

The £2M scheme was supported by the Environment Agency and funded through the Severn & Wye Regional Flood Defence Committee by Flood Defence Grant in Aid, local developer contributions and Shropshire Council. The scheme was designed and developed by consultants WSP, with construction by Alun Griffiths.

The Much Wenlock project is also one of the first Hydro International Hydro-Brake® Flood systems to incorporate Hydro-Logic® Smart Monitoring. The Hydro-Logic® Flexi Logger 100s were successfully installed and commissioned on site on the 24th of July 2017, and are enabling Shropshire Council to track flood conditions, direct response teams quickly and effectively and to gather long-term data on flooding and climate change to inform future flood mitigation strategies and projects.

Steve Davenport, Shropshire Council’s Cabinet member for highways and transport, said:

“I’m delighted that work on this important scheme has now been completed, and that dozens of homes and businesses in Much Wenlock are now at far less risk from flooding than they have been in the past.”

The Much Wenlock site is one of 11 that Hydro-Logic® Services Ltd manage for Shropshire Council.

Phil Collins, Europe Sales Director for Hydro International commented: “This award-winning scheme has been a significant milestone for Hydro International. We have provided not just an exceptional product, technical support and design assistance, but also a managed, site specific smart monitoring and early warning system.”

[Sidebar]

Ideal choice for water or drainage monitoring

The precision-engineered Hydro-Brake® Flood vortex flow controls from Hydro International manage the flow of water.

The Hydro-Logic® Flexi Logger 100 is perfect for remote sites such as culverts, rivers, reservoirs or wetland loggers, or even a rain gauge logger. This battery-operated device has both an internal and external antenna enabling optimisation of the signal on site.

The VEGA Radar sensor for continuous level measurement of water and wastewater; the VEGAPULS WL 61 is the ideal sensor for all applications in water and sewage water applications. It is particularly suitable for use in water processing, pump stations as well as overflow basins, for flow measurement in open flumes and gauge monitoring. Normal 0 false false false EN-US X-NONE X-NONE




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September 2020

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