UncleJJ, I think that normally is better to use floodplains for cottages... at least that's my rule of thumb, except one or two for city growth. My personal beleive is that watermills are a weak improvement, not by it self but because of what you're missing (cottage vs watermill is a 5C vs 2H + 1F(by the way thanks for the correction, it was a typo(writing and eating at the same time = bad move))), and I only use them in Hammer-weak cities that need to do some infrastructure. But I'm a CE player and CE players normally only see cottages...