Following a competitive tendering process HTS (Topbond's UKAS accredited testing division) were appointed by the Environment Agency to undertake a comprehensive suite of insitu and laboratory testing works on Pymmes Brook, between New Southgate to Tottenham. The watercourse is used to carry storm water drainage to prevent flash flooding in this part of the capital, so the surveyors were in daily contact with weather forecasters and always had 2 routes from which to exit the Brook.
The site work lasted for 6 weeks and was undertaken by a 6 man team. The position of all test locations, together the condition of the assets were noted on site and then the location of the test areas was tied to OS grid coordinates by GPS.
The findings, together with the findings from a geotechnical survey, allowed the EA and their consultant Halcrow to make assessment about the structural and material condition of this section of the Pymmes Brook.
Different forms of construction were encountered along the channels ranging from natural banks, masonry walls, reinforced concrete walls and bed to steel sheet piles. This required different modes of transport to travel along the Brook including boats, 6WD amphibious, and pontoons.
Following on from this work HTS won a further contract to carry out similar works on a section of the River Brent between Finchley and Brentford Lock.