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Leveling the pipe
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Once the pipe
has been straightened in the trench, you must check along the
pipe to ensure that is is level from one end to the other.
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the pipe is level and straigh, then you must build in the
necessary slope to make sure that the sewage flows by force of
gravity to the tank. The prescribed slope is 1/4 inch
for each foot of distance. In our example the length of
pipe from the tank to the house is fifty feet. The total
slope would be 50 x 1/4 inch or 12 1/2 inches. You will
notice that we have marked this on the stake in the
picture. We then build up the trench floor under
the pipe to meet this height.
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