• HydroLatch Flood gates
HydroLatch® Flood gates

Reliable flood protection for sewerage and watercourse systems 

The Challenge

Flood protection is also necessary underground so that flood water does not come  through the “back door“, i.e. through the sewer, to flood streets and houses. Streams and rivers overflow their banks more often, more inten-sively and faster due to large impermeable areas and loss of flood plains. The warning and reaction times are shorter; sand bag barriers and manually-operated valves are time-consuming and labour intensive.

The Way 

All overflow sills, inlets and outlet sewers in combined and stormwater networks can be secured with Hydro-Latch® flood gates to prevent flooding of the sewer network. The flood gates work automatically and without electricity. The HydroLatch® flood gates also allow a safe overflow from combined and stormwater networks during rain. Even if the HydroLatch® flood gates are flooded, drainage occurs as long as the water pressure in the sewer network is higher. The special Steinhardt® seal is reliable and durable. All HydroLatch® flood gates  are project-designed so that the gate cover is light (low resistance = large flow-rate) but heavy enough to prevent lifting by flow velocity.

The  Products

The top-hinged HydroLatch® flood gates Model HLA-HK can be applied wherever there is sufficient head difference. They are designed as rectangular or circular flood gates and can be installed to protect overflow/outfall pipework from surcharging. They are designed with a smooth-opening cover to enable opening for low discharge flows; this is achieved by extra weights or the angle of inclination of the flap.

Bottom-hinged  HydroLatch® flood gates Model HLA-FK can be applied wherever the water level difference is very small. The flood gates are designed as floatable fish-belly gates. They can be adjusted exactly to the floating-up point by filling counter weight water inside by means of filling and emptying nozzles. The fish-belly gates have the advantage of low losses and are installed protected in overflow chambers.

The Advantages

  • robust, stainless steel
  • no electricity
  • high operational reliability
  • easy and fast to install
  • with fixing materials, frames, sealing and cover
  • durable, reliable flood gate sealing
  • open with smallest water pressure
  • angle of inclination optional 
  • weights optional
  • warning system optional