I was surprised that this came out so well, an awesome water-down-the-drain sound in my very own kitchen sink. A plastic dishpan was tipped and held there until the water exited. Quite a roar, unmodified except that it is contained in the dish washing file.
Quiet woodland, occasional birdsong, distant roar of high tree branches swaying in the wind (could pass as a distant river too). Recorded on a stereo audio technica bp4025 into a zoom f8 mixer.