HydroBend®

Variable Weir – maximises storage capacity within the surface water system

Surface water/SUDS systems often challenge the engineer with regards to maintaining
water levels within storm water attenuation systems. Maintaining maximum top water
levels during storm conditions, without creating additional surcharging, is not achievable
via the construction of traditional static weirs. As flows increase the head over the weir
increases raising top water levels. The Hydrobend variable weir offers a self regulating
solution to this problem. As flow increases the HydroBend weir progressively alters the
weir edge to maintain a constant top water level.

The HydroBend operates without external energy by means of counter weights
within the body of the assembly. This system enables on site adjustments and calibration
to ensure the accurate control of the spill event and also future changes to quantity/frequency.
In the event of backwater surcharge, the HydroBend counter balance can be upgraded
and the reduction of the overflow quantity can be compensated to ensure the maintenance of the
maximum storage level within the storage system.