Flooding causes untold misery for people whose homes and businesses are flooded and run off from agricultural land reduces the amount of top soil (see our Focus on Farming Report Jan 2018 for further information on this subject) and creates problems with silting up of waterways.
Andy's presentation can be downlaoded here. It highlights a number of natural flood prevention methods including planting new hedgerows with baffle dams to reduce run off down hill sides, log dams and woodland planting. It focuses on the river catchment areas around Braunton in North Devon as a case study.