Silt trap project: Update 4

The silt trap in Mill Lane is now in and functioning!

All that can be seen of it is a nice smooth patch of new tarmac and a manhole cover that will be used to clean the chamber every 6 months or so.

Here is  a picture of Councillor Hamish Pollock checking out the site of the chamber with Wandle Trust Director Bella Davies last week.

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The second chamber on Denmark Road is now well under way and in fact our contractors F.M. Conway will be finished work on Thursday!  In contrast to the first chamber everything has gone smoothly with no surprise pipes emerging to slow us down!

This site has an important extra addition in that we have included two monitoring chambers into the design.  The surface water pipe first feeds into one inspection chamber then into the silt trap before passing into the second monitoring chamber and then on towards the river.

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The silt trap in the ground with the surface water pipe shown in the foreground.   This area of open pipe is where the upstream monitoring chamber is located.

The chambers will allow us to monitor the effectiveness of the traps by taking samples before and after the silt trap.  This will be carried out using automated sampling apparatus to allow analysis of the water quality and any particulates present.

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The access chambers  (Two monitoring chambers and one for the silt trap) being built up to road height ready for the manhole covers.

The third and final chamber project which will be located on Butter Hill will start on 17th June.

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