It's World Rivers Day, and a timely reminder that autumn rain is on its way. After a summer of leaves, moss and general build-up, the drainage on most sites needs a proper look before the heavier rain arrives, not after. A slightly blocked gutter in September is a five-minute fix; left until November, it's water in your corridors, storage rooms and electrics. Here's our six-point drainage checklist for schools and premises, part of our early-term snagging series.