The cleansing of water
I notice in Watertown the symbolism of the dishwasher taking unclean things and washing them clean and spotless, and of course, the impending flood, which also might do the same thing on a larger scale.
Your scenes are meticulous - Always enough detail to sketch the picture with the occaisional fleshing out with paint (I like to "see" everything I read) and the characters are good.
Because I've read the story in so many episodes, I may have missed an overall plot, but don't necessarily change it because (1) I may be wrong, and (2) not all stories have to lapse into formula. You know what you're doing anyway.