FLOW AND SURGE
this by using the full sewer cross-section as a storage facility so preventing the surge flows at the lower end of the pipe that might lead to overcharging and subsequent flooding. When flows below the weir dissipate sufficiently to allow the stored water to be released, it can be done under controlled flow conditions, again so as not to surcharge the pipeline further downstream.
The Uhrig system allows water engineers to manage the storm conditions to the best capacity of the pipeline and minimise the risk to the surrounding areas in terms of surface flooding and the damage, suffering and cost this can cause.
Flushing
Another advantage of the Uhrig system is that even during normal conditions, the standard monitoring and control regime can be over- ridden to allow engineers to close the gates remotely. This allows standard flows to build up in the pipeline behind the weirs; these can then be released by fully opening the sluice gate causing the water rush out of the ‘flooded’ pipe section. The pipe effectively cleans itself by means of “flushing” the system, so minimising silt and other material build up. Furthermore the Uhrig system can also
Schematic of a conventional flow control system
“The Uhrig system allows water engineers to manage storm conditions to the best capacity of pipeline”
be utilised to control ‘normal’ flows to the treatment plant. By maintaining a more regular/constant flow into the plant and minimising flow fluctuations, the efficiency of treatment regimes can be maximised whilst the cost of flow treatment can be minimised. In the
current, economic climate any such cost saving has to be a bonus.
Commenting on the system for Uhrig, Brian Hickland, international sales manager for Uhrig says: “We at Uhrig feel that we can bring a new monitoring and control option to the country’s water engineers allowing them to fully manage and maintain normal full capacity operational systems, as well as unexpected surcharge flows, in an efficient and cost effective way. We can provide examples that show, practically, just how successful the Uhrig system has been in recent years using installations we have designed and installed across Europe.”nnn
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April 2011 Water & Wastewater Treatment 35
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