Pumped drain to sewer etc

[Jacob]

Absolutely, if the fall is too great there is a danger of the flow causing the fluid and solids to separate and leave the solids behind, too little fall and the solids will inhibit the flow, there is a formula to back this up, but normally it's a case of putting a 25mm block on a 1m spirit level if you don't have a Dumpy level (pun not intended)

1:40 to 1:110 for a soil pipe, depending on volume/flow, but the fall into the public sewer IC itself can be from high up. Public sewers can be very deep.