Planting native trees can help battle to control flooding

Published January 8, 2016, in the Irish Examiner, this article begins, “Andrew St Ledger of The Woodland League looks at the benefits that planting native trees can bring in the battle to control waterways prone to flooding.” Excerpts are below; to see the entire article, click on the photograph.

Native woodlands served to control water levels in flood-prone areas until their destruction by poor forestry policy.

WE CAN all agree that we are in desperate need of wise flood-prevention measures that work.

This is a long-running problem — to quote the Chinese emperor Yu, 3,160 years ago whose ancient proverb reminds us, “To protect your rivers, first protect your mountains”.

Within only a few weeks of the conclusion of the Paris Climate Conference — COP 21, many of our lowland towns have experienced extensive flooding. The cause may lie partly with climate change, but one solution to the flooding is much nearer home: In our uplands, where the wrong species of tree and forestry model have been chosen for decades. What is needed on appropriate selected sites in the uplands are native, deep-rooted trees, planted with a view to flood alleviation, soil protection, carbon uptake, small farm viability, and biodiversity — rather than quick profit for the few, which those downstream end up paying for.

Native woodlands in uplands reduce the effects of flooding. This is proven by recent scientific research such as the Pontbren Project, by Bangor University in Wales. They examined the management of upland sites by a group of farmers. It established that soil under mixed native trees absorbs water 67 times faster than under grass: Native trees have such deep roots that they provide channels to send the water much further underground. The soil under native trees acts as a sponge — a reservoir — which sucks in water, then releases it slowly.




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