j probose wrote:

I am planning the installation of a waste pipe (either 3" or 4") over a
distance of 46 feet. The drop in elevation over that distance is 30",
which I calculate to be aprx .65 inches per foot (instead of the nominal
.25 inches per foot). Is .65 inches per foot too much? I COULD
excavate more at the high end, and come closer to the .25 inche per
foot, but is it worth the extra effort? Also, does the pipe size make a
difference?

The only problem with too much slope is that
velocity will be higher and solids *may*
tend to settle out.

4" pipe will have lower velocity, so may help
a bit. In the end, you probably won't have
any problems with this run.

I would install cleanout TEE's brought up to the
surface at each end.

Jim