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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

More from DRAINAGE

Crops And Methods For Soil Improvement

A Bit Of Arithmetic
A Clean Seed-bed
A Few Combinations Are Safest
A Practical Test
A Southern Legume
A Three Years' Rotation
Acid Phosphate
Acquaintance With Terms
Adaptation To Eastern Needs
Affecting Physical Condition
All The Nitrogen From Clover
Alsike Clover
Amount Of Application
Amount Of Manure

Depth Of Trenches

Underdrains may be placed too deep in close soils
for best results. In an early day it was advised that the drains be put
down 4 feet deep. We now know that a tight clay soil may give best
results from a drain only 28 inches deep, or even a little less. In a
looser soil 3 feet is a better depth, and in porous swamp lands the
drain may well go 4 feet deep, thus permitting increase in distance
between drains.

Next: Connections

Previous: Cutting The Trenches

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