"A Clear Future for our River"

Monthly Archives: September 2016

View from a volunteer – Maddie

September 2016 – Volunteering for 2 weeks

Maddie

 

“I am an Environmental Science student studying at the University of Southampton and have a great time getting stuck in with some practical volunteer work with BART. I have had an amazing experience getting involved with river enhancement projects on the River Marden and Midford Brook. I thoroughly enjoyed being waist deep in water constructing brushwood berms which enhanced flows and created new biological habitats. It was amazing to see the difference each structure made. By the end of each construction you could see ample fry moving into each structure literally minutes after each structure was constructed. It’s brilliant to see the immediate effects of BART’s work! It was lovely to go home every day with a feeling of satisfaction that I have played a small part in returning our river systems to a more natural state and providing new habitats for the localised flora and fauna. I feel privileged to have been welcomed, with open arms, into the BART family by Harriet Alvis and Ian Mock and cannot wait to return and volunteer again!! – Maddie”

 

Thank you for all of your hard work Maddie and we look forward to working with you again in the future!

 

Midford Brook habitat enhancement project

 

The Midford Brook habitat enhancement project was an initiative funded by Wessex Water to work with Avon and Tributaries Angling Association (ATAA) to restore a section of river suffering from the effects of historic impoundment, overwidening and straightening.  

The Midford Brook is formed by convergence of the Wellow Brook and Cam Brook at Midford before passing Tucking Mill andreaching the village of Monkton Combe. This section of river was historically a leat stream feeding a mill, with a large weir downstream of the site. For the purposes of hydropower, the river was straightened and over-widened throughout the whole of the project stretch.

 

The Midford Brook project site, overwidened and straightened.

The Midford Brook project site, overwidened and straightened.

Today, the river has somewhat recovered as it has started to re-meander itself and the weir at the bottom of the project site has collapsed, leading to increased flows. However, decades with a lack of significant flow has led to a huge amount of silt accumulation, in quantities that would take several years to be flushed through if left to recover naturally. This silt is smothering gravels essential for invertebrates and therefore is limited fish life within the river.

This project involved the creation of 6 flow deflecting brushwood berm structures along 0.46km of the Midford Brook. These structures have several benefits:

  • To concentrate low summer flows, ensuring sufficient depths of water at all times and therefore cool and well oxygenated flows.
  • To concentrate and scour gravels during winter flows, cleaning gravels of silt
  • To collect silt on the structures (which will then vegetate and form part of the natural bankside) that would otherwise smother gravels
  • To increase habitat availability within the stretch of river, including cover from predators, ambush cover for fish predators and newly created riffles, pools and backwaters for a variety of fish life stages.
  • A secondary benefit of improving angler access to the river.
Volunteers at work in the Midford Brook
Volunteers at work in the Midford Brook
A brushwood berm being constructed.
A brushwood berm being constructed.
A new riffle (and potential future spawning ground) created as part of the project, with a brushwood berm.
A new riffle (and potential future spawning ground) created as part of the project, with a brushwood berm.

These structures have shown immediate benefits in flow conditions with new riffles and pinch points created throughout the stretch of river. We are hopeful that one particular pinch point that has been created in this project will provide flows and less compacted gravels suitable for trout and grayling spawning. We look forward to observing the success of the structures following a season of winter flows.

The cooperation of the Avon and Tributaries Angling Association was essential in the successful delivery of this project and we are grateful for support and interest we have received from this group.

We are extremely grateful to Wessex Water for funding this project.

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