||04-29-2012 07:24 AM
It's a tradeoff among low point in the basement and where you pump the water to. If the floor level varies by more than an inch, that would greatly favor the low point.
The low point has the obvious advantage in that water that got spilled on the floor (such a from a burst water heater) will flow to the pit. But you may end up with a hard to hide or headroom reducing pump outlet pipe going across the ceiling.
Perimeter drain pipes must not slope down away from the sump (pit). (Level from end to end despite a few minor undulations is acceptable.) It may be desirable to lay these before choosing the pit location. Unusual and special and usually more expensive considerations apply if you absolutely positively must run perimeter drain pipes along and below the foundation footers
. You must not pump the water into a septic system and in most cities you may not pump it into the sanitary sewer.