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2 August 2019, 12:01 | Updated: 2 August 2019, 12:08
A damaged reservoir dam feared to be on the verge of collapse is facing a "critical" moment as the military and emergency services work to stop it bursting.
Water flowing into Toddbrook Reservoir has been "reduced considerably" overnight but engineers remain "very concerned" about the integrity of the structure, which contains around 1.3 million tonnes of water.
Thousands of people have been evacuated from the Derbyshire town of Whaley Bridge over fears it could burst and flood their homes.
Julie Sharman, chief operating officer of the Canal and River Trust which runs the reservoir, said water levels had reduced by around 8in (200mm) overnight.
She said: "It is a critical situation at this point in time. And until we're beyond that critical situation, the risk is a material risk and that's why we've taken the action we have."
Our Deputy Chief Constable, @DCCRachelSwann, has outlined the steps taken today to evacuate #WhaleyBridge and areas downstream of Toddbrook Reservoir, as well as the multi-agency plan to address the damage https://t.co/OE03G1Tajh pic.twitter.com/eiybqsziKB— Derbyshire Police (@DerbysPolice) August 1, 2019
Ms Sharman said engineers have told her the crucial puddle clay core of the dam is intact, but it is vital to replace the load on the core lost when the earth was eroded.
An RAF Chinook and firefighters using high-volume pumps appear to have partly stabilised the "unprecedented, fast-moving, emergency situation" caused by heavy rain.
Images taken early on Friday show the helicopter dropping one-ton sandbags to bolster the damaged part of the structure.
An RAF Chinook continues to support the flood relief effort at #whaleybridge working alongside the Mountain Rescue Service and civilian authorities to repair a broken dam. Find out more about the Chinook's amazing capabilities https://t.co/Va3IisQzNI pic.twitter.com/Kf1sWCgBWN— Royal Air Force (@RoyalAirForce) August 2, 2019
Improving weather and work on the inflows means the amount of water entering the reservoir has reduced.
Derbyshire Chief Fire Officer Terry McDermott said there are 150 firefighters working at the reservoir with 10 high-volume pumping crews.
But he said despite progress, engineers remain "very concerned" about the situation.
Mr McDermott said: "The structural engineer is saying if we don't do something there will be a problem.
"It's not going to go away on its own. It's absolutely necessary, the activity that's going on at the moment."
Over the last 24 hours we have had over 150 fire service personal working at the scene in #WhaleyBridge read more at https://t.co/PbfdljK2FS - we are hoping to bring you more images and interviews throughout the day. Keep watching for latest updates and information. pic.twitter.com/Di3aS7EljV— Derbyshire Fire & Rescue Service (@DerbyshireFRS) August 2, 2019
Police have also closed railway lines in the Whaley Bridge area over the risk of potential flooding.
Prime Minister Boris Johnson said "first responders, engineers and RAF crews are working around the clock to fix the dam" and he has ordered Environment Secretary Theresa Villiers to chair a meeting of the Cobra emergency committee to discuss the situation.
After thousands of residents spent Thursday night away from their homes, police said a timescale for evacuees returning is "currently unknown".
Carolyn Whittle, who lives in Meadowfield on the hillside in Whaley Bridge, said: "I've lived in Whaley for the best part of 45 years and I've never seen water flood over the dam like that, ever, nor thought that we could possibly be at risk in this way."
The Environment Agency issued a "danger to life" warning covering the River Goyt on Thursday, as the river could "rise rapidly" due to water rushing in from the reservoir.
Meanwhile, clean-up operations are under way across parts of the North West hit by heavy rain, including Poynton in Cheshire, a town whose residents were evacuated on Wednesday night.
Overall, the Environment Agency has 10 flood alerts, six flood warnings, and one severe flood warning in place across England.
Outstanding work by our partners @DerbysPolice, @CanalRiverTrust alongside #TeamEA in #WhaleyBridge last night to ensure the community remained safe from the risk of #flooding. #Multiagencyresponse #Teamwork #Incidentready https://t.co/fuM7eeengA— Env Agency NW (@EnvAgencyNW) August 2, 2019
Richard Parry, chief executive of the Canal and River Trust, said an annual inspection of the Toddbrook Reservoir by a senior engineer took place last November.
Toddbrook Reservoir is on the north-west edge of the Peak District National Park and was built in 1831, according to experts, although the Environment Agency record it as being built in 1840-41.
The structure supplies water to the Peak Forest Canal, a waterway running between the town and Ashton-under-Lyne, Greater Manchester.