Temporary Construction Methods – Over-pumping
When working in a water course it is often necessary to isolate the working area and keep dry an entire section of river, stream / burn or ditch. A barrier is constructed across the full width of the watercourse upstream of the works area and water is transfer from upstream of this barrier to downstream of the works area via pumps. This maintains ‘normal’ flow in the watercourse either side of the isolated reach.
Where works of this nature are undertaken they are programmed to minimise the impacts of the water environment and disruption to the free passage of fish and aquatic animals. Works will be timed depending on the species present identified through surveys.
Pre-construction surveys for protected species are undertaken followed by targeted mitigation including electrofishing to ensure all animals are removed from the work area.