› Stainless steel 316 construction ensures
  reliable trouble free operation
› The maximum storage level setting may be
  easily modified after installation of the device
› Hydraulically ideal shape of the weir flap
  ensures blockage free discharge
› Integrated counterweight design eliminates need
  for separate counterweight chamber
› Easy retrofitting of existing basin overflows
  possible (additional storage volume gain)
› The Overflow Bending Weir Type U is available
  with seals on all four sides, so that it can act as a
  backflow prevention device for flood protection
› Lower storage tank construction costs owing to smaller tank volumes (the Overflow Bending Weir
  Type U allows for 100 % utilization of storage tank volume as opposed to only 70 to 80% for
  conventional weirs)
› Increased water pollution protection since discharge from the storage tank to receiving stream
  commences only after complete filling of the available storage volume or after reaching maximum
  storage level.

 

Application

Once a combined sewer overflow (CSO) tank (or sewer) or a stormwater overflow tank (or sewer) is full, any additional influent water must be able to reach the receiving stream. In the past this was usually accomplished with the use of fixed weirs. However fixed weirs have inherent disadvantages including: increased water pollution, lower usable tank and sewer storage volumes and no backflow protection. To avoid the disadvantages of fixed weirs increasing use is made of overflow bending weirs such as the unique Overflow Bending Weir Type U.

The Overflow Bending Weir Type U is designed to ensure that a constant maximum storage level is maintained upstream of the weir so that full utilization is made of all the available upstream storage volume. The Overflow Bending Weir Type U is designed to open just enough to allow the additional influent water to overflow the weir while maintaining the upstream water level. This ensures that the frequency of overflow events is reduced which results in reducing the discharge of highly polluted water to the receiving stream.

The entire overflow weir length can be utilized for overflow level control. The compact design makes the system particularly suitable for structures with limited space and for installation in existing structures. The special weir construction makes virtually constant maximum storage levels possible, even under backflow conditions.

 


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