Before revision: A Mersey flat on the Sankey Canal, approaching the Sankey Viaduct (1831) A Mersey flat is a type of doubled-ended barge with rounded bilges, carvel build and fully decked .
After revision: A Mersey flat on the Sankey Canal, approaching the Sankey Viaduct (1831) A Mersey flat is a type of doubled-ended barge , they were commonly used on the River Mersey .