User blog comment:D2r/Unanswered Questions of Redwall/@comment-174.70.39.218-20110425192803/@comment-1479469-20110425193635

It's not described as being a particularly large pond, though - that, and there's no water intake described in the books (insofar as I recall - if someone can show me a passage where they mention how the pond is fed, I'll strike the question). You'd think it'd get stagnant really fast.