[Sasq40]

Originally Posted by Frogger

Yes water will always find a level and it will drain if it is lower, however as I stated before when installing drainage you have to maintain a minimum of 1 to 2% over the entire distance. If there are any low points there is the potential for debris accumulating and eventually blocking the line. Blocked line = wet floor. A 1" main line and a 3/4" backup line will not move a lot of water if you only have a 1% grade.

What the distance and we can calculate out the minimum elevation change required?

Let's see if this works
Fish tank layout by Kael Short, on Flickr