River Roach

This part of the brook flows through Priory Park so the channel changes from concrete reinforcement to a more natural structure. There is inchannel vegetation and also some bankside vegetation but this is heavily managed and generally consists of short amenity grass and ornamental plants.

The area (land use)

The dominant land use for this stretch of river is recreational grassland.

No livestock were recorded.

Channel characteristics

The river channel consists of mainly gravel and pebbles, and riffles are present.

At the time of recording the flow of water was medium and the channel was 1-2m wide and in depth.

For most of this stretch the channel profile is steep and concrete lined in places.

Bankside trees were occasional, marginal plants and in-channel plants are frequent. Woody debris was noted to be rare.


The channel has been straightened and man-made enhancements are present along this stretch of river.

Field drains were recorded as present and barriers / culverts are .


Areas of trampling / poaching were present in the upstream section only and areas of erosion were present in the upstream section only at the time of the survey.


The species seen during the survey were: Mallard, Black-headed Gull, House Sparrow, Blackbird, Wren, Crow, Woodpigeon and Brown Rat.

Additional Information

There is more available habitat due to the absence of the concrete reinforcement in this area. Therefore more could be made of this area to create a diverse river habitat. At the time of the survey some work was being carried out on the banks downstream but what this consisted of and why the work was being carried out is unknown.

Some algae was seen upstream but the problem was not as expansive as it was in the concrete reinforced area further upstream.

There is still a problem with urban drainage.


River Roach

Date completed


Upstream Grid ref (red marker)


Downstream Grid ref (green marker)


Website key stakeholders:

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Design by LTD Design Consultants and build by Garganey Consulting based on an original concept by Herts and Middlesex Wildlife Trust