Almost one in five new homes in west London is in an area at high risk of flooding.
There were 789 new properties built between 2015 and 2016 located in flood zone three (FZ3) according to figures analysed by Groundsure, a UK authority specialising in environmental risks such as flooding.
That works out as 17.8% of the total 4,426 new builds registered during the period.
Hammersmith and Fulham is the place with the highest percentage locally, with 96% of its new builds (386 of the 402) located within FZ3.
That places the borough not far behind table-topping Boston, which has 97.8% of its new builds located in FZ3 - the highest in England.
Areas classed as FZ3 have a high probability of flooding. Land within these areas have a 1 in 100 or greater annual probability of river flooding or a 1 in 200 or greater annual probability of sea flooding.
In comparison, land in a zone with a low probability of flooding has less than 1 in 1,000 annual probability of river or sea flooding.
Within west London, Westminster had the second highest percentage (33.5%) locally of new buildings located in FZ3, with 189 out of a total of 565.
The report also gives the percentage size of FZ3 land in each borough.
Dan Montagnani, managing director at Groundsure, said: “While all development in flood plains is subject to stringent flood risk assessment in both design and construction, this data shows that variation in the proportion of development occurring on the flood plain differs hugely from one local authority to the next."
Across England, one new property built in every 11 was located within FZ3 in 2015/16 - approximately 9,000 out of total 111,000.
This works out as a proportion of 9%, increasing from 7% in 2013/14 and 8% in 2014-15, data from Land Use Change Statistics and Environment Agency national flood zones reveals.
Areas of high risk of flooding cover 10.8% of England.
|Borough||No of new builds registered||No of new builds registered FZ3||Percentage of new builds FZ3||Percentage of borough which is FZ3 land|
|Hammersmith and Fulham||402||386||96||54|
|Kensington and Chelsea||348||5||1.4||6.1|
Meanwhile, the proportion of land changing to residential use in FZ3 has increased from 5% in 2013/14 (182 hectares out of 3,562) to 7% in 2015/16 (321 hectares out of 4,628).
Referring to the figures, an Environment Agency spokesperson said: “The Environment Agency advises on all proposals for major development in areas that are at a medium or high risk of flooding, although Local Planning Authorities make the final decisions.
"In the last year approximately 99% of new homes we advised on were decided in line with our advice.
“We also work closely with local authorities to manage flood risk of new developments through measures such as new flood schemes or revised building design such as raised floor levels.”
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