Stonbury are immensely proud to be supporting our clients across the UK at such a crucial time and have been designated as 'key workers' by DEFRA and the UK water utility companies. Our teams are working tirelessly to help secure and maintain drinking water supplies, ensuring clean and safe drinking water is provided without interruption to critical services such as our hospitals as well as the general public. Now more than ever, the safety and wellbeing of our staff is of the utmost importance and we have adapted our safe working practices to ensure social distancing precautions are in place and that the correct hygiene practices are being followed. Safety is our priority, and we endeavour to make sure everyone at Stonbury goes home safe to their family.
Working closely with the client and the Environment Agency, a method of works was agreed and the relevant permit was applied for, to allow the works to be completed. Temporary pollution control measures were then installed downstream of the lake to avoid any silt or oils entering the watercourse.
Regular monitoring was required to ensure the works were not impacting the watercourse and the quality of the water. This was done at a monitoring point located further downstream and involved several checks each day.
The flow from the river was redirected into the lakes natural bypass channel using the existing penstocks, which maintained the flow downstream. However, a pump was also on standby to support the flow where required.
Once the lake had drained down to a suitable level, an excavator was used to install a section of timber posts around an extension to the existing island. The void was then filled with small branches and vegetation to create a containment bund for the silt removed from the lake bed.
The silt was dredged using a 13T excavator and was cast into the newly built bund. Once the bund reached capacity, the lake was refilled in a controlled manner to prevent silt getting washed downstream.