I am in the process of designing my new darkroom and it looks like I will have a 15 foot sink. I know that the usual slope for proper drainage is 1/4 inch per foot—this works out to 3 3/4 inches over 15'. Do I really need this much slope? It seems like a lot, but of course it is a LONG sink. And yes, the drain needs to be at the end, not the middle. I can work with it if I need to, but just thought I'd ask for clarification. Thanks!
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