During flooding events, an additional danger can be caused by ‘slash’ (felled trees from plantation forests with no commercial value which have been left lying onsite). The trees can be picked up by flood waters and rafted down onto farmland and into rivers before washing out to sea and fetching up on beaches. When the trees get caught against the piles of bridges they can often make flooding worse. This is the Waipunga Road bridge over the Esk River in the Hawke’s Bay following Cyclone Gabrielle in February 2023.
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