Articles & Case Studies

Hidrostal provides Fish Protection for Flood

Posted: Thursday 9th May 2019

Almost 10 years ago, the beautiful market town of Ross-on-Wye, close to the Forest of Dean in Herefordshire, was the benefactor of a £7m Flood Alleviation scheme. The DEFRA funded project was designed to prevent a 1% (1 in 100) annual probability of flooding to the low-lying areas of the town.

The flood defence scheme was designed to increase the amount of water that would flow through watercourses and culverts by means of a flood alleviation tunnel which ran between the Homs Road and Kings Acre car parks. The successful project protected the 10,700 residents of the town from a repeat of the devasting floods which had occurred in the past.

A decision was recently made to change the existing pump within the chamber from a macerator type to a Fish Friendly pump. Hidrostal, manufacturers of ultra-low shear pumps, which were originally developed and patented in the 1960’s for use in the fisheries industries, were pleased to be able to offer a solution to prevent fish mortality in the future.

Hidrostal worked closely with Balfour Beatty not only to supply the pump but also to develop modifications to Homs Road pumping station in order to make the site Fish Friendly. This included a new discharge pipework system which delivers the flow directly into the brook. This pipework also includes a syphon break chamber to allow the pump to have a free discharge at all time.

Due to the variance in operating levels with the chamber, the pump is operated on a VSD to enable it to stay within its fish friendly performance range. The levels have been set to limit the pumps operation at high flood times when the chamber and the brook are at the same level.

Hidrostal are experts in both Fish Friendly and Fish transfer pumps suitable for a wide variety of sizes and specifies of both fish and eels. Their pumps are suitable for aquaculture, water extraction and land drainage applications.

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