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Counting The Cost
Cutting The Trenches
Depth Of Trenches
Establishing A Grade
Kind Of Tile
Locating Main And Branches
Material For The Drains
Permanency Desired
Size Of Tile
The Grade
The Laterals
The Modern Fallow
The Outlet

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The Grade

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.

Next: Establishing A Grade

Previous: Kind Of Tile

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