Bury Brook Walk Over with the Environment Agency

Myself and two members from the Environment Agency (Catchment Co-ordinator and Geomorphologist)  went on a walk over of Bury Brook at the end of October this year. The aim was to identify/confirm reasons for WFD failures and also to identify what actions could be taken (long term, short term and by EA or others) to try and improve the health of the river. The following are  my observations and thoughts:

  1. Flow: Flow rates were generally slow. The river has been over widened for drainage purposes and  relies on surface water run off to feed it. As it is on clay bedrock it is probably a flashy river and we visited after a period of low rainfall which might account for a lower flow rate but some river stretches were extremely slow indeed, leading to…..
  2. Sediment: in many places the river had a deep layer of silty sediment. This is  probably caused by run off from fields and slow flow.We did see sites where the slope of the fields, lack of natural barriers (hedgerows etc) and limited /no buffer strips would be likely to lead to high run off rates. Deep layers of sediment do not make good habitats for invertebrates or fish and act as a source of stored nutrients which adversely affect river water quality and associated wildlife.
    kings-ripton-compacted-buffer-strip

    Compaction in buffer strip

    3. High phosphate levels:  were indicated by large amount of nettle growth upstream and various algal growths downstream including filamentous algae. The most likely cause of these high levels upstream is run off; downstream there are two sewage treatment works which might also be contributing phosphates into the river.

ramsey-golf-course-sedimant-algae

Algae and sediment

      4. Some good signs : where the river has had “light touch ” management it is showing signs of reverting back to a more natural state. In places the bed was gravelly with varying width and flows and it was even beginning to re-meander within its deep channels with the occasional berms or islands  developing. On the golf course quite far downstream the EA had done some restoration work and created artificial berms.

So what could we do? 

  • Investigate phosphate levels upstream in high flow conditions
  • Consider what actions could be taken to reduce field run off
  • Selective bank clearance where it is heavily overgrown to create more varied habitats
  • Further sediment removal to create artificial berms/pools

Riverside Walk and Talks – Denver and March

The culture and history of The Fens is strongly linked with the watercourses that drain the area. However, every action on the ground has the potential to impact these watercourses.

Image from Cambridgeshire ACRE

Narrow boats on the river at March. Image from Cambridgeshire ACRE

The Water Care Partnership is hosting two guided riverside walks at Denver and March on the 20th September. This will be a chance for you to enjoy a walk along the riverside whilst also learning about some of the impacts that are affecting our rivers. The walks will be approximately 2-3 miles with frequent stops to take pictures and talk about our rivers.

River at Denver

Denver. Image by Cambridgeshire ACRE

To find out more about the Riverside Walk & Talks, please contact Jennie Thomas, Water Catchment Officer at Cambridgeshire ACRE 01353 865044 or jennifer.thomas@cambsacre.org.uk. Spaces are limited, to book please visit – www.smartsurvey.co.uk/s/walkandtalk.

Riverside Walk and Talk

The Water Care Partnership will be hosting some ‘Riverside Walk and Talks’ during September. To start with, there will be three events:

Welney – 14/9 AM

Denver – 20/9 AM

March – 20/9 PM

Depending on the success of these events more may be available at a later date.

The walk will be a gentle stroll of approximately 2 miles. It will give you the chance to enjoy your local river and we will also be discussing some the issues that rivers in general face. We will then discuss some of the more specific problems that are facing Fenland rivers and why these rivers are so important to us.

After the walk some light refreshments will be provided and this is an opportunity for you to highlight any issues that you might be aware of and find out ways that you can help protect your local water environment.

If you would like to take part in a ‘Riverside Walk & Talk’, please contact Jennie Thomas, Water Catchment Officer at Cambridgeshire ACRE (jennifer.thomas@cambsacre.org.uk or 01353 865044).