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Restore our meadows, a most cost-effective flood defence

For the second winter running the UK has been hit by widespread flooding, accompanied by agonised debates over whether government is really committed to adequate spending on flood defence. Largely overlooked…

More appealing and often more effective than concrete flood barriers. John Haynes

For the second winter running the UK has been hit by widespread flooding, accompanied by agonised debates over whether government is really committed to adequate spending on flood defence. Largely overlooked, however, are traditional systems of agricultural management which can help keep floodwaters at bay.

For centuries, almost all lands lying in the floodplains of English rivers were meadows. Managing these meadows involved an annual hay cut followed by grazing, providing essential hay feed for livestock over winter. Nutrient-rich silts deposited on the meadows by regular flooding acted as natural fertiliser, leaving them reliably productive. But over the past 70 years, the vast majority of these meadows have been lost to housing development, gravel extraction and quarrying, water abstraction, changes in agricultural use, or just lack of management.

Flood meadows, the unsung hero

Natural floodplains, and in particular floodplain meadows, could play a vital role in reducing the sort of flooding that has repeatedly wreaked havoc in towns and villages across Britain over the past decade. Meadows have the capacity to store vast quantities of flood water and release it slowly over time, lowering the peak water level. In contrast, modern flood defences use embankments to constrain floodwater to a narrow channel. This simply pushes the problem downstream, until floodwaters reach levels that can overwhelm defences – with sometimes catastrophic results.

The reason why meadows are so effective at soaking up sudden influxes of water is because traditional meadow systems produce good, open-structured soil. This not only supports a wide range of plant species, but also increases their capacity to absorb and store water. By comparison, the tilling (ploughing) of fields common with modern agricultural methods leaves soils more compact, reducing their ability to absorb water. Meadows represent an agricultural system that actually works in harmony with a dynamic river system: as well as absorbing flood water, they collect and put to good use the sediment that would otherwise be deposited further downstream, causing blockages and smothering valuable riverbed habitats.

A contemporary example of how such a system is actively aiding flood protection is Clifton Ings in York, managed as an official washland by the Environment Agency. By storing floodwater during periods of high flow it can reduce peak levels in the centre of York by 15cm – enough to blunt the risk of significant flooding. The site is managed as a traditional meadow and is a valuable habitat for wildlife – so much so that it has just been designated as a Site of Special Scientific Interest.

So other than their role in alleviating floods, floodplain meadows are among the UK’s most biodiverse systems, commonly boasting more than 30 different plant species in a single square metre, such as great burnet and rare snakeshead fritillary. The soils and plantlife also sequester carbon, helping in its own way to mitigate global warming, improve water quality by trapping phosphates, and of course are by themselves a beautiful landscape to enjoy.

Restoring meadows' place in the countryside

And yet despite all the environmental benefits they bring, the loss of floodplain meadows over the last 70 years has been so rapid that less than 1,500 hectares of species-rich habitat now remain in the UK – an area only slightly larger than Heathrow airport. This loss has undoubtedly contributed to the rise in catastrophic flood events we have seen. Is it possible to turn the clock back? Our research with the Floodplain Meadows Partnership suggests it is.

A key to these meadows' survival is to maintain or revive their traditional management. Originally handled by farmers, they rely on a viable agricultural system to keep them productive, and so ensure they are not displaced for other agriculture or development. Understanding how traditional management systems work and disseminating that knowledge is one function of the partnership, created in 2007 to focus on this key, threatened habitat and explore means of conservation.

Once lost is not always lost. We have demonstrated that it is possible to re-create floodplain meadows, given the right sites and with the right techniques. There are a number of good examples where the process of restoring meadows has begun, with many new projects beginning around the country. Financial support for restoration is currently available through Natural England’s Higher Level Stewardship scheme, and the partnership website holds information on how to go about restoring meadows, and links to local organisations that can help.

Perhaps we can never return to the golden age of the British meadow, but a renewed focus on how we use floodplains is long overdue. Money spent to enhance the role of meadows as an environmentally beneficial, sustainable and effective system of flood defence would be a sound long-term investment.

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2 Comments sorted by

  1. Michael Hay

    retired

    This English technique is valuable where 'river meadows are able to be left in grass.
    In Australia, river flats are generally left as grazing land, but the variation and denseness of the forage is nothing like the lushness of England's. The idea of leaving a flood plain to be intermittently flooded is good practice, but in Australia, I think there must be formed a series of 'batters' or 'dykes' in order to stem the fierceness of our flood-flows.. Perhaps planted red gums (which need flooding) may help but, I doubt that Australian farmers would be foolish enough to attempt to transplant a type of management in its entirety from one set of circumstances to another which is vastly different and expect it to work.

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  2. Jamie McMillan

    logged in via Twitter

    Tragedy that England's water meadows - the specific type of meadow you are writing about - have been left to decay. They need a complex infrastructure of channels, sluices and small bridges for livestock - which I've seen all gradually rot away in my local river valley.

    The deliberate winter flooding was as much to speed the growth of grass (warmer under water) as to fertilise with silt, and reverse soil erosion. They were fabulously productive in an age without artificial fertiliser. Thomas Hardy's 'Valley of the Great Dairies' in Tess of the D'Urbervilles was primarily a water meadow based agriculture. Now it's ryegrass and maize fed with nitrates.

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