ewest, My pond has a stream of water leaving it at least 95% of the time year round. My vertical stand pipe is 30 inches in diameter, and the trash rack that sits over the stand pipe is 48 inches in diameter. The trash rack extends 1 foot above the water level and 7 feet below the water level so as to force water from 7 feet below to overflow into the stand pipe and out of the pond. It's really a very typical stand pipe overflow system. With this system every time the water level rises 1 foot above the normal level you are pulling water off the top rather than 7 feet below.
I'm glad to learn that the pond dye is a bad idea, you fellows have convinced me to opt for the feed and fertilize combo.
