The first half shows willow spiling at Clay site during a bankfull event, fully submerged (with only some shoots visible). The flow velocity was reduced and more unifrorm in the spiling and immediately donwstream. The second half shows situation two days later after rapid drop in water level (below mean summer water level) and the collpased bank in the secton upstream of spiling. There was no obvious erosion on the spiling or immediately donwstream.
