Essex Rivers Hub

River Pant Pressures

The table below shows the current pressures that this waterbody faces and the solutions that could be put in place to solve these problems. You can learn more about some of these pressures and solutions on the Environment Agency Catchment Data Explorer or you can contact us to find out more.



Signal Crayfish have been most recently recorded on this water body in 2004, 2007, 2008 and 2012. Signal Crayfish cause changes to the natural bankside habitat and also out-compete our native crayfish. They are fierce predators and can completely change fish and invertebrate communities so that they are no longer in their natural state.

There is currently no known solution to the invasion of Signal Crayfish, regular monitoring is needed to ensure a strategic approach when a solution has been identified.


Himalayan Balsam has been most recently recorded on this water body in 2013 and it covers an extensive area. This pretty plant, with pink flowers, is fast growing and hardy. It covers river banks and shades out native plants. In the winter, Himalayan Balsam will die down, leaving bare banks that are susceptible to erosion.

Himalayan Balsam can be removed easily by pulling it from the ground (including the root), snapping the basal stem and then leaving it in a pile to rot down. If you would like to get involved in pulling this invasive species, or would like to organise a work party, then please let us know through the contact us page.


American Mink have been most recently recorded on this water body in 2009 and 2011 . American Mink cause a wide range of problems on a river, including playing a large part in the local extinction of many natural species such as water voles and kingfishers.

In order to eradicate mink, they must be trapped and dispatched. Trapping must be done catchment wide as mink can travel large distances. It is important that there are enough people involved in a trapping project to ensure that the traps can be checked regularly. Monitoring mink, water vole and otter presence on your river can also help us when planning eradication programmes.


Giant Hogweed has been most recently recorded on this water body in 1990s and 2012. This plant has been in the news a lot more recently due to the horrific burns that its sap can give the skin. This invasive plant is so large that it is able to shade out other native plants.

Giant Hogweed MUST be removed by a professional ONLY. The plant is sprayed off and then removed in a safe manner. If this plant has already been removed from this waterbody then please let us know, if it is spreading further then get in touch.


This water body is classified as heavily modified for flood protection and as part of the Ely Ouse water transfer scheme.

Investigate improvements to channel morphology and habitat quality.
Re-engineering of the river where the flow regime cannot be modified.
Appropriate channel maintenance strategies and techniques that minimise disturbance to channel bed and margins 

Flow is classified as 'not high' indicating that there are some issues with flow in this water body. This is also impacting on dissolved oxygen levels.

Investigate feasible measures to maintain flows throughout the year.
Reinstate monitoring at Great Sampford to better understand the current state and to inform feasible measure and improvements

Phosphate is classified as poor in this water body. The probable cause is sewage outlets.
Dissolved oxygen is classified as poor in the water body, one factor impacting this is sewage outlets, especially when flow is low and temperatures are high.

Investigate if sewage outlets are licensed and not exceeding their limits.

Phosphate is classified as poor in this water body. The most like diffuse pollution causes are agricultural and rural land management (poaching/runoff from arable land). There is also a possibility that the Ely Ouse transfer scheme is having an impact.

Investigate whether the Ely Ouse transfer scheme is impacting on phosphate levels.
Give advice to farmers on how to reduce phosphate entering the water body through changes in farm practices.


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