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French Drains
EZflow
French drains are used for dewatering soils where water saturation
is at an undesired degree. Standing water, soil or muddy soil can be
eliminated by installing
EZflow
French drains to gather unwanted water and move it to a downstream
outlet.
EZflow
10" diameter units with 4" diameter perforated pipe are installed in
a 10" or wider trench. The depth of trench should be 18" or more and
have a downward grade to a downstream outlet to help standing
surface water drain.
EZflow
assemblies with aggregate only can be installed above the assembly
with pipe. Percable soil backfill may be desirable.
Subsurface drainage such as
EZflow
French drains need to be installed with an even downward slope
toward an outlet. Minimum slope should be about 1" per 10'. This may
require the use of a builder’s level and level rod. A barrier over,
or no more than 3/4" around,
EZflow units may be required to prevent sand-like soils from entering EPS
aggregate. Type of barrier can be untreated building paper, filter
fabric, newspaper, or straw and should be selected based on site
conditions. Local practices in similar applications and soils may be
a guide as to the type of barrier that should be used.
For drainage of large areas, subsurface drainage can be installed in
herringbone or similar pattern. Spacing and depth of
EZflow
rib pipes depends on soil type, rainfall, etc. Capacity of spine
pipe may have to be larger than the capacity of a single
EZflow
unit. Local practice for similar applications may be a guide. Using
a professional designer should be considered if subsurface drainage
is critical.
EZflow
may be used under areas of light to medium surface loading.
EZflow
should only be used under areas of heavy surface loading such as a
parking lot, when installed at depths of more than two feet.
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