This sample was taken on a stretch of The Chess known as the lake. I understand that it was created as a diversion from the main Chess channel for the original Estate House, Loudwater House which is directly next door to the sample site.
The same was taken in the somewhat reedy edge of the water - I couldn't get further in because of a fence.
It is a short way downstream from the other Loudwater sample in The River Chess.
This 'lake' was originally very deep but it now quite shallow with silt. However, there is quite a flow running through it.