Mannington Hall stream restoration

In March 2020 we completed a project on the Mannington Stream which drains into the main Bure at Itteringham.

Despite being a small tributary, the stream has been straightened and widened in the past which has degraded the health of the stream. To help improve the habitats, we used trees from the riverbanks to introduce ‘large woody debris’ into the stream.

This helps to diversify flow, creating areas of faster flow and slower pools, which in turn helps to clean gravels and deposit sediments.

The tree branches also create refuge habitat for juvenile fish and invertebrates, such as dragon fly larvae and mayfly larvae. This is a tried and tested restoration technique that is widely used, however at this site due to the low flows we’ve been able to create these features without the need for any engineering such as stakes, to secure the pieces of wood.

Trying to mimic what would happen in a natural storm, and working with the Internal Drainage Board, we have used large pieces of wood that won’t be easily moved by the flows. This helps create a much more natural look to the works and means there are no man-made materials left on site. Using trees from the adjoining riverbanks also allows more light to enter the channel which encourages more plants to grow supporting more wildlife.

We’re very excited to complete our repeat surveys of the site to see how the ecology has changed.