Two Hydro-Brake® Flood vortex flow controls, installed in discreet, newly-refurbished culverts on the outskirts of the town, reduce flooding risk in Northallerton, UK.
The North Yorkshire town of Northallerton and surrounding villages have been plagued with flooding since the early 20th Century, with major floods most recently in 2000 and 2008 that caused widespread disruption and damage including to the town’s Friarage Hospital.
To reduce the risk of flooding to about 300 properties, the EA has adopted a solution designed with advanced self-regulating hydrodynamic vortex flow controls to protect against a 1 in 100 years storm with a 30% extra provision for climate change. Detailed hydraulic modelling was conducted for the Northallerton catchment before designing the new solution.
“The solution is designed to protect the area from flash floods, even in the event of an intense storm which could occur only once in 100 years, even with climate change,” continues Ian Cooke. “The design meets sustainable principles, by attenuating (holding back) excess flows and allowing them to discharge at a controlled rate." says Ian Cooke, Environment Agency project manager.
As well as providing storage along the Turker Beck site, an opportunity for improving the habitat to accommodate a biodiversity action plan has been taken, by including 12 m buffer strips on the previously cultivated land. This is expected to qualify for Entry Level Environmental Stewardship and, with adjacent tree and hedge planting, will improve water quality as well as encourage wildlife; early consultation with Natural England supported this action.