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England’s wettest week for decade brings hours of sewage discharge and ‘cocktail of pollutants’ in rivers

Campaigners are raising the alarm about the impact this week's weather is having on rivers, as data show a huge increase in sewage discharges

England has endured the joint wettest week for at least a decade, bringing hundreds of hours of sewage discharges and a “cocktail of pollutants” to the country’s rivers

New data released by the Government on Thursday showed that the week leading up to 24 October had the joint highest amount of rainfall in England for at least 10 years as Storm Babet hit the UK.

Central England recorded the most amount of rain during the period (79mm), followed by the East of England (78mm). With a week left of the month, the East of England has already had the third wettest October on record since 1891 and has recorded more than two and a half times the average amount of rain for the region during this period.

Communities in Scotland, the Isle of Wight and the Midlands were among those worst-hit by the storm last week and heavy rain has continued to batter parts of the UK since, with more forecast in the coming days.

Environmental campaigners have raised the alarm about the impact the weather has had on Britain’s rivers, which they say have been hit with a lethal combination of sewage discharges and runoff pollution from roads and farms.

The sheer volume of rain has led to a dramatic increase in the amount of sewage being discharged into rivers, i has learned.

Water companies are permitted to discharge untreated sewage into rivers at times of exceptional rainfall if their pipe networks are overwhelmed. Thames Water is currently the only water company that publishes real time data on when it is discharging sewage.

Data analysed by the Rivers Trust, and shared with i, showed that average weekly hours of sewage spills across the Thames Water region were up 60 per cent over the last two weeks compared to the average figure for the year so far.

Data collected by River Mole River Watch showed the local area, which is covered by Thames Water, had seen 424 hours of sewage spills between 18 and 24 October, accounting for more than 10 per cent of the total hours for this year so far.

It is understood Thames Water’s real time data only indicates discharges, rather than confirming them and can therefore sometimes include inaccuracies.

A Thames Water spokesperson said improving the health of rivers was a “key focus” of the company and that they had plans to upgrade more than 250 sewage treatment works and sewers.

It is possible that the sewage discharge figures could be even higher for water companies based in areas such as the Midlands that were worse affected by the storm.

Flooded fields around the River Lugg near Leominster, after Storm Babet battered the UK, causing widespread flooding and high winds. The Environment Agency has warned that flooding from major rivers could continue until Tuesday, amid widespread disruption caused by Storm Babet which is posing a 'risk to life' in some areas. Picture date: Sunday October 22, 2023. PA Photo. See PA story WEATHER Babet. Photo credit should read: Ben Birchall/PA Wire
Flooded fields around the River Lugg near Leominster (Photo: Ben Birchall/PA Wire)

Rebecca Duncan, spokeswoman for conservation charity the Rivers Trust, said flooding was having a “catastrophic effect on river ecosystems”.

Alongside an increase in sewage discharges, she said water running across land “brings pollutants such as agricultural and road runoff with it, accumulating in rivers which are already in an extremely delicate state”.

The River Wye is one of the areas that was subject to pollution from farm run-off this week. Campaigners took to social media to share videos that appeared to show top soil being washed down towards the river bed.

Flooding along the River Severn in Shropshire , after Storm Babet battered the UK, causing widespread flooding and high winds. The Environment Agency has warned that flooding from major rivers could continue until Tuesday, amid widespread disruption caused by Storm Babet which is posing a 'risk to life' in some areas. Picture date: Sunday October 22, 2023. PA Photo. See PA story WEATHER Babet. Photo credit should read: Nick Potts/PA Wire
Flooding along the River Severn in Shropshire (Photo: Nick Potts/PA Wire)

Charles Watson, chairman and founder of River Action UK, who recorded one of the videos, said the soil is “laden with nutrients” that lead to a “cycle of destruction” in rivers such as the Wye, as algae growth restricts oxygen for invertebrates and wildlife.

He accused the Government of failing to enforce rules that are in place for farmers to mitigate the impact of heavy rain on river pollution, particularly as Britain continues to see more extreme weather due to climate change.

“We are now seeing seven or eight storms a year when we might have been seeing one every two or three years. The whole system that has been underinvested, underregulated and underenforced is now coming under intolerable stresses and strain,” he said.

BRECHIN,SCOTLAND - OCTOBER 20: Members of the coastguard rescue team wade through the flood waters to check on people in houses on October 20, 2023 in Brechin Scotland. Areas close to the river have been overwhelmed by water which breached the flood defences in the early hours of this morning. Rare Red weather warnings are in place in Scotland and amber warnings in the north of England until Saturday as Storm Babet sweeps the country. (Photo by Jeff J Mitchell/Getty Images)
Members of the coastguard wade through flood waters to check on people in houses in Brechin, Scotland (Photo: Jeff J Mitchell/Getty)

Jo Bradley, director of operations at Stormwater Shepherds, warned rivers in urban areas have also been damaged this week due to the “cocktail of organic pollutants, toxic metals, sediments and tyre wear particles” that are washed off motorways into rivers during periods of rainfall.

A new online map published by the charity Thames21, partly funded by the mayor of London, shows the parts of the city that are worst affected by contaminated rainwater being washed into rivers, with Barking and Dagenham and Barnet being highlighted as the two worst areas.

Ms Bradley said these pollutants are washed into rivers and settle somewhere downstream, having a devastating impact on wildlife, for example by causing creatures to mutate or making them unable to reproduce.

It comes as scientists warn that the UK is likely to see an increase in events such as Storm Babet as a result of climate change.

Climate scientist Dr Friederike Otto told i earlier this week that extreme storms have become twice as likely in the UK since the pre-industrial era and have become 10 to 20 per cent more intense in terms of rainfall.

Ms Duncan said: “We are already seeing an increase in extreme weather events as a result of climate change and our infrastructure – engineered and nature-based – is not set to be able to cope with these pressures. As a sector and a country, we must address this problem so we are more resilient to increasing flood risk and minimise the impacts on people and wildlife alike.”

A Defra spokesperson said: “The recent heavy rain and the resulting run off highlights the importance of Our Plan for Water, which sets out more investment, stronger regulation and tougher enforcement to tackle pollution and clean up our waters.

“We are also committed to tackling agricultural pollution. We have set a new legally binding target to reduce nitrogen, phosphorus, and sediment from agriculture entering our waterways, while also funding 4000 water quality farm inspections a year and doubling the funding to our Catchment Sensitive Farming scheme to ensure farmers can receive free advice on reducing water pollution.”

An Environment Agency spokesperson said because the world is “already seeing the impacts of climate change, including flooding”, urgent action is needed to adapt to the “impacts” of it “at the same time as reducing emissions”.

They added: “When we experience heavy rainfall, this can cause pollution by washing contaminants from agricultural land and causing sewers to overflow into our rivers. We are working closely with the agricultural sector and water industry to put measures in place to minimise the impact of these events on our rivers to ensure nature can flourish.

The spokesperson also claimed the organisations flood defences have meant 374,000 homes are better protected since 2015 – and is also planning a record £5.2bn investment to “better protect hundreds of thousands of more properties”.

A Defra Spokesperson said “the recent heavy rain” and the “resulting run off highlights the importance of its ‘Plan for Water’ which sets out more investment, stronger regulation and tougher enforcement to tackle pollution and clean up our waters.

They said: “We are also committed to tackling agricultural pollution. We have set a new legally binding target to reduce nitrogen, phosphorus, and sediment from agriculture entering our waterways, while also funding 4000 water quality farm inspections a year and doubling the funding to our Catchment Sensitive Farming scheme to ensure farmers can receive free advice on reducing water pollution.”

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