Precast Headwall with Extended Cascade Spillway

When required we are able to extend the spillway of many of our standard range of precast headwalls. In this instance we extended the spillway with a cascade panel made up of several diffuser blocks.

An extended spillway with cascade panel dramatically reduces the velocity with which the water discharging from connecting pipework enters the watercourse.

In this particular instance we also provided a factory fitted HDPE flap valve to prevent backflow up the connecting pipework during storm events or periods of flooding and high water