Yet Another Quaint Rural Custom

I had my first sight of the Croftend Lake this year. When I bought the Mansion, the estate agent did mention that an adjacent piece of land floods “every year” but assured me that my land is too high up ever to be under water. Croftend didn’t flood last year, but it has flooded rather well this year and the locals are celebrating by paddling about on it using bright-orange inflatable boats.