Services provided Design
Project location Scotland
Client Dumfries & Galloway Council
Consultant The Ewan Group plc
Products used Type CX Hydro-Brake® Flow Control device
 
 

Challenge

The small harbour and fishing port of Portpatrick on Scotland's Galloway coastline lies at the foot of a range of hills which catch the prevailing rain coming over Ireland from the Atlantic.

The village suffered from flooding from the Dinvin Burn which runs through its centre. The last major incident occurred in October 2000, when the burn overtopped its banks, flooding the main street and causing extensive damage to shops, hotels and houses. Climate change and more unsettled weather could increase the frequency of these storm conditions.

Solution

To help alleviate flooding, Dumfries and Galloway Council invested in an earth dam incorporating a 727mm-bore Type CX Hydro-Brake® flow control device to regulate the flow.

Outcome

James McLeod, Senior Engineer for the Dumfries & Galloway Council explains: “The best place to build a retaining dam was on agricultural land at Merrick, above the village, incorporating a flow attenuation device. This was designed to release water up to a maximum of 850 l/s identified by the Council’s consultants, The Ewan Group Plc as the volume the watercourse could carry.”

“To achieve this flow attenuation at maximum head of water, the fixed opening of a standard orifice type device would have had to have been relatively small, and this would have backed up water in the dam even at low water heights. Furthermore, the large opening of the Hydro-Brake® unit (between three to six times larger than the equivalent orifice plate) meant it was less susceptible to blockage from water borne debris.”

“The benefit of the Hydro-Brake® Flow Control is that its larger diameter allows greater flows to pass at lower heads, whilst still restricting the flow within design limits. This ensures that land take under most conditions is much less than with alternative fixed opening devices, and means that the farmer who owns the land will suffer flood inundation of his fields much less frequently.”


Challenge

The small harbour and fishing port of Portpatrick on Scotland's Galloway coastline lies at the foot of a range of hills which catch the prevailing rain coming over Ireland from the Atlantic.

The village suffered from flooding from the Dinvin Burn which runs through its centre. The last major incident occurred in October 2000, when the burn overtopped its banks, flooding the main street and causing extensive damage to shops, hotels and houses. Climate change and more unsettled weather could increase the frequency of these storm conditions.

Solution

To help alleviate flooding, Dumfries and Galloway Council invested in an earth dam incorporating a 727mm-bore Type CX Hydro-Brake® flow control device to regulate the flow.

Outcome

James McLeod, Senior Engineer for the Dumfries & Galloway Council explains: “The best place to build a retaining dam was on agricultural land at Merrick, above the village, incorporating a flow attenuation device. This was designed to release water up to a maximum of 850 l/s identified by the Council’s consultants, The Ewan Group Plc as the volume the watercourse could carry.”

“To achieve this flow attenuation at maximum head of water, the fixed opening of a standard orifice type device would have had to have been relatively small, and this would have backed up water in the dam even at low water heights. Furthermore, the large opening of the Hydro-Brake® unit (between three to six times larger than the equivalent orifice plate) meant it was less susceptible to blockage from water borne debris.”

“The benefit of the Hydro-Brake® Flow Control is that its larger diameter allows greater flows to pass at lower heads, whilst still restricting the flow within design limits. This ensures that land take under most conditions is much less than with alternative fixed opening devices, and means that the farmer who owns the land will suffer flood inundation of his fields much less frequently.”


 
 
 
Downloads
  • Hydro-Brake® - Portpatrick Flood Defences Case Study
    Hydro-Brake® - Portpatrick Flood Defences Case Study
    1pp 1.1MB
    Download
  • Hydro-Brake® Flood Alleviation
    Hydro-Brake® Flood Alleviation
    4pp 1.69MB
    Download
  • Hydro-Brake® Flow Control Series Brochure
    Hydro-Brake® Flow Control Series Brochure
    12pp 2.09MB
    Download
 
 
 
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