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Wednesday, 06 December 2006
Novel Hydro-Brake® Complex Flow Control Controls Flow for Cumbria
For a new housing development on the site of the former Rowntree Chocolate factory in Egremont, Cumbria, the installation of stringent stormwater discharge controls was required by the Environment Agency. By devising an unusual two storey configuration of Hydro International’s Hydro-Brake® flow control devices, the consulting engineer Richard Bland was able to meet the specific discharge profile required at a competitive cost. Richard Bland, consulting engineer RAB Engineering Design Ltd, commented: “The EA requirements were complex, and we had to meet discharge limits for 2, 30 and 100 year events. The discharge profile had to mimic the former factory’s stormwater outfall profile so that it would be compatible with the local storm drainage and facilitate adoption by United Utilities. Hydro-Brake® delivers the requisite control of head at the best possible value, and Hydro’s service support was impressive.” The site is intended for 14 homes (6 semis and 8 bungalows) on 0.48 hectares from local developer Stuart Williamson and 72 homes (high density and detached) on 1.40 hectares from Persimmon Homes. The discharge calculations with the roofs, roads and other surfaces made up 1.04 hectares of impermeable area and resulted in limits of 30 l/sec (2 year event) 51 l/sec (30 year event) and 62 l/sec (100 year event) being agreed.   

The Hydro-Brake® Flow Control devices are mounted at the discharge end of a 2.4 m diameter, 42 m long concrete pipe which is used to balance the stormwater storage.  A 207 mm SXH Hydro-Brake® Flow Control is sited at the invert of the pipe, with a 170 mm SXH Hydro-Brake® Flow Control located 1.6 m above it, all of which are connected to the outfall via a purpose-made junction. The lower Hydro-Brake® Flow Control provides flow attenuation for the low return period storms.  At high flow rates, the upper Hydro Brake® Flow Control operates in conjunction with the lower Hydro-Brake® Flow Control as required by extreme storm conditions. 

 egremont-control_chamber-detail_colour.jpg                            Consulting Engineer: RAB Engineering Design LtdDevelopers: Stuart Williamson Ltd; Persimmon Homes PLC           If you would like any further information on Hydro-Brake® or any of Hydro International’s stormwater, wastewater and sewage treatment systems, please call 0800 269371.
 
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