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The Grade

Categories: DRAINAGE

The outlet may fix the grade. If it does not, the main,

branches, and laterals should have a fall of 3 inches, or more, to the

100 feet. This grade insures against deposits of silt and gives good

capacity to the drains. If the outlet demands less fall in the system,

the main may be laid on a grade of only a half inch to the 100 feet

with satisfactory results. Such a small fall should be accepted only

when a lower outlet cannot be secured, and great care should be used in

grading the trench and laying the tile.



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