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UK

Green-fingered laziness is putting homes at risk of flooding, says report

Green-fingered laziness is putting homes at risk of flooding, says report
Newsexplored
20th January 2017
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Submersed sign from prior floodingGETTY

Paving over gardens leaves them more liable to flooding because the water cannot be absorbed

Many gardens in the UK have been paved over to make them low maintenance or provide off-street parking, but surfaces that do not absorb water reduce the amount of rainfall that can be dealt with naturally, increasing runoff.

This runoff generated from heavy rainstorms can overwhelm urban drainage systems and cause flash flooding.

Dr David Kelly, from Heriot-Watt University in Edinburgh, has assessed the increased runoff from a "typical" front garden depending on how much it is paved in the face of the more intense rainfall that is expected with climate change.

The impacts of climate change mean that the UK is facing increasingly frequent and intense rainfall

Dr David Kelly

He looked at the impact of paved gardens in Edinburgh, London, Exeter and Manchester with the increased heavy rain the cities could see in the 2050s and 2080s.

All four cities are expected to see increases in rainfall as a result of climate change, even with low greenhouse gas emissions, with Exeter seeing the greatest increase of up to 41 per cent by the 2050s and as much as 73 per cent by the 2080s.

With more intense rainfall, there will be a dramatic increase in the contribution of paved gardens to the overall amount of runoff in each of the cities, to levels urban drainage systems are unlikely to be able to cope with, Dr Kelly found.

Flooding in Northern England, 2015GETTY

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Decreasing vegetation in towns and fewer permeable surfaces mean that flash flooding is a risk

Based on the number of gardens in each city which are currently at least three-quarters paved, runoff from a storm in Edinburgh in the 2080s could increase to as much as 29,000 cubic metres of water – enough to fill 12 Olympic swimming pools.

In Manchester the total runoff could also fill 12 Olympic swimming pools, in Exeter the figure is around half as much, and across London the amount of runoff created could fill a swimming pool 100 times over.

But the research also showed that gardens without any impermeable paving produced no runoff, even in a one-in-50 year heavy storm.


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Dr Kelly called for a tightening and enforcement of regulations to prevent more gardens being paved over.

And he said there was need to raise awareness among householders about the impacts of climate change and the "little bits of actions they can do themselves" to encourage social responsibility.

People should be encouraged to "de-pave" their gardens or introduce more natural vegetation to reduce runoff, he suggested.

Drain overflows in Russian floodGETTY

Drains are at risk of being overwhelmed during heavy downpours

He said domestic front gardens covered almost 30 per cent of urban space and played a vital role in managing surface water runoff, with natural gardens acting like "sponges" to absorb water.

"The growing trend of paving over front gardens has put this role in jeopardy, and at the same time, the impacts of climate change mean that the UK is facing increasingly frequent and intense rainfall.

"Existing urban drainage systems will be inadequate to cope with the level of increased runoff from paved front gardens," he warned.

Original Article

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UK
20th January 2017
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