Lose yourself in the labyrinth weir

What on earth is a labyrinth weir I hear you ask? A weir is a barrier across a river or pond designed to alter its flow characteristics. A labyrinth weir uses a trapezoidal-shaped weir wall geometry (plan view) to increase the weir length. So choosing a labyrinth weir makes the structure smaller, which was all important in the design proposals as it means less impact to the Heath.

The one labyrinth weir being built as part of the Ponds project is at Hampstead No. 1. It is currently under construction with the concrete walls of the weir still to be poured. You can make out the shape of the weir in the steel reinforcement bars which are already in position.IMG_5500

In the event of a large flood, water will leave the pond, go through the weir and then down the culverts which are currently being laid. The structure protects the earth dam from erosion and possible collapse. It is worth remembering this concrete structure will remain dry except in a very large storm.

The culvert sections are currently being craned into position.

Once this structure is complete it will be buried in topsoil and planted with shrubs and bushes so it fits in with its surroundings.

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3 Responses to Lose yourself in the labyrinth weir

  1. Nicole Segre says:

    I’m puzzled. Where will the overflow water will go?


    • Hi Nicole, thanks for your comment. The water will leave the pond through the labyrinth weir and then down the culverts and eventually into the area below the culverts. This will only happen in an exceptionaly large storm and ensures the integrity of the dam is protected in a large storm event. Currently the water would have risen and then overtopped the dam at the lowest point which could then cause erosion and eventually collapse. The labyrinth weir will remain dry except in a very large storm.


  2. Victoria Osborne says:

    A year in, early starts, chain saws, intrusive sustained noise from heavy plant, pneumatic drills, dealing with stadia lighting throughout the shorter days, the noise pollution has destroyed the local Heath resident’s habitats, no more foxes, no owls heard in over 12 months. The whole scheme has been disruptive, I can no longer open my windows due to sustained construction noise from 7:30/8 am through to 5/5:30 6 days a week. The dirt and dust has been devastating for my asthsma. With no good will offering, the view of the pond from my home utterly distorted and altered for all time, the impact on personal welfare and good health has been unrecoverable.


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