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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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Establishing A Grade

If the grades are light, they should be
established by use of a telescope level. Most of the cheap levels are a
delusion. A stake driven flush with the surface of the ground at the
outlet becomes the starting point, and by its side should be driven a
witness stake. Every 100 feet along the line of the proposed drain and
laterals similar stakes should be driven. Their levels should then be
taken, and when the fall from the head of the system to the outlet is
known, the required cut at each 100-feet station is easily determined.
It may be necessary to reduce or increase the grade at some point to
get proper depth in a depression or to save cutting when passing
through a ridge.

Next: Cutting The Trenches

Previous: The Grade

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