Initial works aimed at putting the reservoir back into use are already under way
With the results of the investigation into the reasons for last summer’s failure at the Peak Forest Canal’s Toddbrook Reservoir expected “within weeks”, initial works aimed at putting the reservoir back into use are already under way.
The dam’s auxiliary spillway, intended to carry away surplus water after abnormal rainfall, suffered severe damage to its concrete surface while carrying out this function following a very heavy downpour, despite an independent inspector having given the reservoir a clean bill of health only months earlier. Both a Canal & River Trust study and an external investigation are expected to report shortly.
In the meantime, a plan has been devised for a temporary repair. The central section (about half of the total width) of the spillway is to be fitted with a new a waterproof liner, and separated by concrete barriers from the remainder of the spillway (including the damaged section). A new 1.5m high concrete raised concrete weir will be built along the top of the dam at the head of the spillway, but with a lower central section to direct any surplus water into the relined central section of the spillway. Work is also planned on the inlet from the Todd Brook, and the bypass channel intended to carry surplus water around the reservoir.
These are interim works to guard against extreme weather in the short term. They will not enable the reservoir to be refilled, and will probably be removed for the permanent repair in 2021. CRT Asset Improvement Director Simon Bamford said: “We are keen to hear the findings of the independent inquiries so we can move forward and decide how best to fix the dam for the long term. Once we know what caused the damage to the dam we will be able to work out a detailed plan for repairs.”
Meanwhile, CRT continues to make plans for water resources for the Cheshire Ring during the rebuilding work, including works to feeder channels to improve the supply from the other reservoirs still supplying the Ring.
