![]() Since the floodplain volume is usually many times larger than the channel volume, the concept becomes a major engineering project and a major environmental change." Dredging of river channels does not prevent flooding during extreme river flows … The concept of dredging to prevent extreme flooding is equivalent to trying to squeeze the volume of water held by a floodplain within the volume of water held in the river channel. ![]() It reflects what his advisers in the Environment Agency have been trying to say for years, before being sat on by ministers wanting instant answers to complex problems and then – as the government still plans – being sacked in droves.Ī presentation by the agency, called To Dredge or Not to Dredge?, spells out the problems in terms that even ministers can understand: "The river channel is not large enough to contain extreme floods, even after dredging. ![]() Coming from the man who insisted in November that he would do what he could to help farmers keep the hills bare, this was an astonishing and welcome turnaround. ![]()
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