Erosion control measures are a key part of the hydro inlet channel design at Pershore Weir. These were incorporated in order to prevent erosion and subsidence of the banks of the hydro inlet channel over the long term, as well as to encourage plant growth.
This was achieved in a number of ways. The bed of the hydro inlet channel was lined with a hard packed “as-dug” clay layer. On the west (river) side, the upper banks of the leat are reinforced with rock supported by geo-textile, which then blends with topsoil to tie into the existing level of the river bank.
On the opposite (east) side, the banks are lined with a coir mattress pegged into the substrate. Coir is a natural fibre extracted from the husk of a coconut and is widely used for riverbank and coastal reinforcement. On both sides of the channel saplings will be planted at 6 metre intervals.
Other measures to combat erosion will also be used. Localised sheet piling and rock armour will be employed permanently to prevent erosion. This is because of exiting sands and gravels at lower levels. Walls will be piled at the inlet of the leat channel and the inlet of the turbine installation. The leat channel side slopes will be battered back with a ledge for planting purposes, and a rock layer will be placed to hold the surfaces intact while plant growth takes to the sides. At the outlet, rock will be positioned at low-level to prevent bank erosion.
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