Articles & Case Studies


Posted: Friday 23rd April 2010

Hydro International’s Hydro-Brake® Flow Controls have been installed into a new dam, near Devil’s Bridge, on the Blackburn Brook, just outside Sheffield. JBA Consulting specified two of the large flow control devices to reduce the risk of flooding on the nearby Thorncliffe Industrial Estate, and surrounding residential areas.

The Blackburn Brook runs through a 500 m long culvert beneath the Thorncliffe Industrial Estate. The small weir, situated on the brook, creates a holding capacity of just 4000 cu.m; this isn’t large enough to provide protection from flooding. As a result, the industrial estate and nearby housing have suffered flood damage and disruption. A dam, creating a potential storage capacity of 32,000 cu.m, is therefore being constructed, approximately 300 m upstream of the culvert, to alleviate this.

Joăo Santa-Clara, consulting engineer, JBA Consulting, commented: “The area suffered from extensive flooding in 2007, due to a 150 year storm event, which exceeded the capacity of a culvert on the local Blackburn Brook. The flood caused a great deal of damage and a dam was needed to prevent a repeat.

“By installing two 1098 mm diameter Hydro-Brake® Flow Control devices, we can control the water flow to match the maximum capacity of the culvert, without the stored water taking excessive land in a restricted area and country park.”

Alex Stephenson, Stormwater Division director, Hydro International, added: “The Hydro-Brake® Flow Control installation will control the flow, up to a design maximum of 5.7 cu.m/sec, so will protect the culvert and prevent overtopping.

“Above this flow, the stored water will back up behind the dam but the flow characteristic of the devices limits the speed of back-up compared to other forms of flow control, saving in the region of 10-15 per cent of land grab.

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