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What Is
Dewatering? Dewatering means
“the separation of
water from the soil,”
or perhaps “taking
the water out of the
particular
construction
problem
completely.”
This leads to
concepts like pre-
drainage of soil,
control of ground
water, and even the
improvement of
Controls ground water,
and even the
improvement of physical
properties of soil.
Intercepts Seepage
Achieves
waterproofing
objectives
What Does Dewatering
Do?
Origins
Of
Dewatering
Human efforts to
control water predate
recorded history.
The first practical
wellpoint dewatering
system in the U.S.
was used in
Hackensack, NJ
in 1925.
Excavation Support
Systems Rendered
Unstable
Future
Settling Lost
Time
Decreased Worksite
Consequence
s Of Improper
Dewatering
Dewatering Methods
Wellpoint
Syste
m
A wellpoint system consists of a
number of wellpoints spaced along
a trench or around an excavation
site, all connected to a common
header, which is attached to one
or more wellpoint pumps.
Wellpoint systems are most
suitable in shallow aquifers where
the water level needs to be
lowered no more than 15 or 20
feet. Due to the vacuum limitation
of the pump, excavations that are
deeper will require multiple
stages of wellpoint systems.
Deep Well
System Deep well systems consist of
one or more individual wells,
each of which has its own
submersible pump at the
bottom of the well.
Deep well systems are suitable
for water-table or confined
aquifers and will lower the water
table 100 feet or more in a
single lift without staging.
Eductor
System The eductor system is
generally used in areas
where the soils have a low
permeability. It is especially
well suited for deep
excavations with stratified
soils. The eductors are
installed at relatively close
spacing similar to the array
in wellpoint systems, but
require only a single stage
to effect draw downs of up
to 100 + feet.
Open
Pumpin
g
The removal of water
from a site or an area
commonly called;
sumping, unwatering,
or open pumping.
Axial flow pumps on a
temporary pump
station was capable of
pumping 200,000
gallons per minute
(gpm) with a standby
capacity of 30,000
gpm.
Temporary &
Permanent
Dewatering Systems
Intercept Seepage
Improve the excavation and the backfill
characteristics of the excavation to allow
construction to proceed in a safe and
efficient manner.
Achieve waterproofing objectives.
Reduce or eliminate lateral and/or
uplift pressures.
Permanen
t
Temporar
y
Details Of A Dewatering
System
Considerations When
Selecting A Dewatering
System
Size & Depth Of The
Excavation
Location And
Environment
Proximity Of Existing
Structures
Existence Of Any
Contamination
Soil Characteristics
And Subsurface
Conditions
Aquifer composition
and distribution
Hydraulic
conductivity,
transmissivity,
storage coefficient
Flow rate calculation
for proposed
construction area to
be dewatered
Aquifer
Characteristics
Constructio
n Schedule
Time always equals money
in construction
How does the Dewatering
System impact the budget and
schedule?
The Dewatering system should be
a long term asset for ongoing
operations

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Controls Groundwater and Improves Soil Properties