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UK Housing Market and Climate Change, Floodplain's & River Flooding Risks

Housing-Market / UK Housing Feb 11, 2014 - 02:23 AM GMT

By: Nadeem_Walayat

Housing-Market

The people of Britain during January and February 2014 have received a wake up call that climate change is real and will increasingly impact on their lives over the coming years, busting the myth that climate change consequences were decades away as home owners not only have to contend with rising sea levels impacting on low lying coastal regions but also with what were once deemed to be extreme weather storm events that are increasingly becoming a regular occurrence.


2014 has seen a series of Jet stream driven storms dumping large amounts of water over most of Southern England every 2 to 3 days, far beyond the capacity of the river systems to cope that have been continuously overflowing onto already saturated land resulting in ever escalating flood alert warnings as illustrated by the below map.

Many scientists use the term Global Weirding to describe what is taking place with our climate as melting of the sea ice at the north and south poles effects atmospheric air current circulations such as the diversion of the Jet Stream resulting in the ongoing series of extreme weather events, where this year it is heavy rainfall whilst last year it was extreme cold and snowfall.

Whilst prospective home buyers can change many aspects of their properties after purchase, however one thing they cannot change is the geography of the location so it is of utmost importance the home buyers seek to mitigate the flood risk as a consequence of climate change by following a few simple rules in their property selection process so as to prevent making a disastrous decision resulting in a property that they may be unable to re-sell at a later date.

The problem of homes being flooded can only worsen not only as a consequence of climate change but also due to the madness of over 10,000 houses continuing to be built on flood plains each year with desperate buyers enticed to purchase at discounts of 10% to 20% against similar properties higher up, with the Environment Agency estimating 17% of homes now being at risk of flooding.

The key points to consider in terms of the evaluating the risk of flooding is not just whether the property is near the coast and thus subject to sea level rise but also how far is the property in terms of its distance in height from the valley floor / river basin. This can be worked out by comparing the difference in elevation by subtracting the properties ground floor height above sea level against the height above sea level of the nearest valley / river basin i.e. a property 50 metres above sea level against the nearest river that is 30 metres above sea level would put the property at +20metres above the river basin.

In my opinion, home buyers should as a minimum not buy properties of less than 30 metres above sea level AND 10 metres in elevation from the valley floor / height of the normal river, even though this would remove many properties out of potential target areas and tend to extend to far beyond the environment agency's own flood maps that tend to only cover 2 to 4 metres above the normal height of nearby rivers as recognised flood plains.

The reason for the extra minimum height is to not only guard against the uncertain future as a consequence if climate change induced sea level rise and heavy rain fall flooding, but also to allow for failure of the drainage system which means that properties tend to flood to several metres above the height of overflowing rivers.

More reasons to only consider properties well out of range of a flood plain is that even if a property has never flooded, just by being near a flood risk area is enough to increase insurance premiums or worse make properties uninsurable that would put off many prospective home buyers and thus result deep under valuation at time of selling of anywhere between 10% to 30% as compared to similar properties situated on just 10 metres higher ground.

So as a general rule prospective home buyers should not contemplate buying properties that are less than 10 metres above the height of any nearby river, water way or valley floor which puts virtually all riverside and flood plain properties out of contention so as to mitigate both the risks of actual flooding and negative effects on house prices.

Furthermore as the global warming climate change mega-trend continues to play out properties that are far beyond the flood plains and valley floors are increasingly look set to secure a price premium over lower lying properties of even on the same street.

The starting point in understanding the flood risks of one's target location is to visit the Environment Agency's website and enter the post code for the area, this will give an over view of the local flood map. Then use this as a guide to compare against elevation maps of the target area, finally fine tuning down to individual properties and aiming to ensure that they are well beyond the minimum 10 metre height from the normal river levels.

Flood Plain Properties

For those already stuck with properties within few metres height of rivers or situated on flood plains then the only solution apart from attempting to move when the dust dies down is to have effective plans in place to cope with inevitable flooding such as having temporary barriers and a pump on standby, and ensuring drains are fitted with non return valves.

For those who remain determined to buy properties despite being on a flood plain then they need to ensure that the property has been built with flood defences in mind i.e. built on stilts that put the property at least 1.5 metres above the highest preceding recorded flood. Unfortunately rather than being the norm most new build properties on flood plains do not tend to incorporate such structural defences such as having the the residency area built over a ground floor garage which effectively adds 3 metres to the ground floor height of the properties.

This article is an excerpt form my new UK Housing Market ebook that will be available for FREE later this month.

Source and Comments: http://www.marketoracle.co.uk/Article44368.html

Nadeem Walayat

http://www.marketoracle.co.uk

Copyright © 2005-2014 Marketoracle.co.uk (Market Oracle Ltd). All rights reserved.

Nadeem Walayat has over 25 years experience of trading derivatives, portfolio management and analysing the financial markets, including one of few who both anticipated and Beat the 1987 Crash. Nadeem's forward looking analysis focuses on UK inflation, economy, interest rates and housing market. He is the author of five ebook's in the The Inflation Mega-Trend and Stocks Stealth Bull Market series.that can be downloaded for Free.

The Stocks Stealth Bull Market 2013 and Beyond EbookThe Stocks Stealth Bull Market Update 2011 EbookThe Interest Rate Mega-Trend EbookThe Inflation Mega-trend Ebook

Nadeem is the Editor of The Market Oracle, a FREE Daily Financial Markets Analysis & Forecasting online publication that presents in-depth analysis from over 600 experienced analysts on a range of views of the probable direction of the financial markets, thus enabling our readers to arrive at an informed opinion on future market direction. http://www.marketoracle.co.uk

Disclaimer: The above is a matter of opinion provided for general information purposes only and is not intended as investment advice. Information and analysis above are derived from sources and utilising methods believed to be reliable, but we cannot accept responsibility for any trading losses you may incur as a result of this analysis. Individuals should consult with their personal financial advisors before engaging in any trading activities.

Nadeem Walayat Archive

© 2005-2019 http://www.MarketOracle.co.uk - The Market Oracle is a FREE Daily Financial Markets Analysis & Forecasting online publication.


Comments

PJ
11 Feb 14, 14:49
Flood Plains

Homes built on flood plains should be left to nature. It doesn't matter how amazing your flood defences are, if there is an exceptional amount of rain rivers will break their banks. It has to all go somewhere. And with climate change and increasing numbers of houses being built, its only going to get worse.


HistoryMan
11 Feb 14, 15:50
Planning Permission

Planning permission is given by local councils, against Environment Agency advice, and because the developers employ so-called 'drainage experts' who claim there is absolutely no problem! They also bribe the local councils with promises about local infrastructure like roads, as well as being hand in glove with government who often lets these applications on flood plains go through on appeal. You are right in what you say. They should be shamed. As a planning councillor for twelve years I NEVER supported this but lots of my colleagues did!

HistoryMan


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