Depth Of Trenches
Categories:
DRAINAGE
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.