John Brooks Company
Limited
Gravity vs Low Pressure
Systems
March 5, 2015
Introduction
•Requires minimal environmental disruption
•Solves difficult sewer applications
•Proven, reliable technology
•Saves money
LPS: An Alternative Sewage Collection System
The System
• A grinder pump station
is located in the yard or
basement of each home.
• Sewage flows into the
station from the
building’s sewer line
(typically 4-inch).
• The basin contains a
specially-designed
grinder pump with
integral level controls.
The System
• The pump is activated when
the depth of sewage in the
tank reaches a
predetermined “on” level
and continues to run until it
reaches the “off” level.
• The run time is short, power
consumption is low, and a
long pump life is ensured.
• The pump grinds the
sewage into a fine slurry
and discharges it into the
sewer main.
ALARM
ON
OFF
The System
The grinder pumps are
connected to a small-diameter,
low pressure main laid along
the edge of the roadway,
following the contour of the
land. The low pressure main
delivers the wastewater
to a central treatment
system, lift station,
manhole, or force main.
Transporting sewage
several thousand feet to a
discharge point at a higher
elevation is commonly
accomplished with low
pressure sewers.
The System
A New Option for
Builders and Developers
E/One Sewers provide builders and developers with
cost-effective, high-quality, proven solutions for central
sewers.
Discover New Freedom
in Land Planning
Land projects or orphan sites once considered cost
prohibitive to develop can now generate profits.
Reduce Upfront Costs. Increase Profit Margins.
Infrastructure development costs are lowered
• Major excavation is eliminated
• Labor and material costs are dramatically reduced
• Environmental disruption and restoration are
minimized
E/One Low Pressure Sewers are your solution
for financial success
Your Alternative
to Gravity
Gravity Systems
With conventional gravity sewers:
• Wastewater leaves the home and flows down sloped
pipes
• Because wastewater can only flow downhill so far, it is
necessary for a lift station to pump it up, so that
gravity can take over again
• The lift station process occurs as many times as
necessary to get the wastewater to the treatment
facility
• Each lift station can occupy a potentially marketable
lot or brutalize sight lines
Gravity Systems
Gravity sewers require big equipment,
major excavation and lift stations.
A better solution with obvious advantages.
• E/One Sewer Systems do not rely upon the limitations of gravity
• Wastewater is pumped through small diameter pipes following the contour of the land, set just below the frost line
• Lift stations are eliminated in virtually every installation
E/One Sewer Systems
E/One Sewer Systems
E/One Sewers
cause minimal
disruption because
they are placed in
narrow, shallow
trenches.
Directional boring
can eliminate the
need for trenches.
E/One Sewer Systems
The bigger the pipe, the higher the costs.
Gravity sewers require mains up to 24 inches in diameter.
Gravity Systems
Smaller pipes dramatically reduce
up-front costs.
E/One Sewers start with
1 ¼- inch PVC piping
from the home to 2- to 4-
inch PVC force mains.
E/One Sewer Systems
Which would you rather buy and install
five miles of: 4” or 24” pipe?
Gravity Sewers
bury your capital
in the ground.
They require:
• Time and money with
big equipment
• Major excavation and
restoration
• Expensive materials
High labor costs
All Up-Front Costs
Gravity Systems
The Money Story
Total Savings
The E/One Sewer System can
reduce costs by 50% or more
compared to conventional
gravity systems.
Cost per Linear Foot Comparison
0
10
20
30
40
50
60
70
80
90
6' Deep 12' Deep 18' Deep 2" Dia 3" Dia 4" Dia
$ per Linear Foot
Gravity
(8” pipe) E/One Sewer
(Average depth 3-4 feet)
The E/One Sewers cut up-front costs
and reduce installation time.
• Reduced carrying costs
• Deferred material and infrastructure costs
• Requires only shallow, narrow trenches
• Fewer manholes and lift stations
• Accelerated infrastructure development
E/One Sewer Systems
Spending Delayed Until House is Built
The cost of the pump and installation is deferred until
just prior to closing.
E/One Sewer Systems
• Flexibility in development design and sight lines; no deforestation
• Performance – more than 35 years experience; over 500,000 users worldwide
• Environmental safety – closed system eliminates groundwater contamination from failed septic tanks
• E/One Sewers can be specified for virtually all site conditions
• Groundwater infiltration eliminated by pressure-tight mains, minimizing size of treatment plant
Additional Benefits
Gravity
Systems:
Gravity Systems
Burying Your Money
in the Ground!
Cost Comparison: Saw Creek, PA
Hilly terrain with a high water table
2,500 units installed
Savings: $3,043,000 or 49%
$ M
0
1
2
3
4
5
6
Gravity E/One
Cost Comparison: Weatherby Lake, MO
Rolling hills waterfront
300+ units installed
Savings: $3,400,000 or 55%
$ M
0
1
2
3
4
5
6
7
Gravity E/One
Cost Comparison: Hartland Township, MI
Steep shorelines
590 units installed
Savings: $1,164,000 or 17%
$ M
0
1
2
3
4
5
6
7
8
Gravity E/One
Savings: $5,569,000 or 43%
Cost Comparison: High Springs, FL
Flat terrain with significant hard rock sub-surface
1,350 units projected
$ M
0
2
4
6
8
10
12
14
Gravity E/One
Cost Comparison: Hood’s Hollow, WI
Environmentally sensitive land with a running creek
29 units installed
Savings: $147,000 or 31%
0
50
100
150
200
250
300
350
400
450
Gravity E/One
$ 000s
Riverview Landing
Fairfield Glade
Case Studies
An elegant country estate community in upstate New York
Riverview Landing
Developing this
spectacular 160-acre
site overlooking the
historic Mohawk River
was cost-prohibitive
for a conventional
gravity system.
The Land
The Problem
• Steep, rocky terrain
• Dense clay soil mixed with weathered shale
• E/One Sewer System using 1 1/4-inch PVC piping
• 3-inch street mains at a depth of only 5 feet
E/One Sewers saved more than $100,000, cutting up-front
costs by more than 50%.
The Solution
Country Estate Community
• 42 estate homes
• Price range: $400,000 to
$1,000,000
• 2- to 4-acre lots
• Golf course, fish ponds,
tennis courts and boat
slips on the Mohawk
Riverview Landing Today
“We had to provide an on-site sewage disposal
solution. There were no public sewers available.
E/One’s low pressure sewer system was the only
economical and feasible way to go. In doing so, we
saved over $100,000.”
“We saved over $100,000…”
Michael Mastropietro Consulting Engineer
Riverview Landing
A resort and retirement community in Tennessee
Fairfield Glade
Eleven lakes
scattered throughout
a picturesque
wooded setting in the
Cumberland
Mountains presented
a unique challenge
for developers.
Spectacular lake-front sites set high in the Cumberland
Mountains (the elevations range between 1,665 feet and
3,000 feet) promised to be a dream setting for upscale
homeowners. Yet these same qualities presented a
unique challenge for developers.
The Land
• Sub-surface
sandstone
• Extensive lake
frontage
• Wide range of
elevations
Fairfield Glade sits on a hard-to-blast sandstone. The
waterfront properties and rolling elevations made gravity
sewering largely impractical.
The Problem
• Installing 31 miles of
E/One Sewer
• Connecting 2- and 6-inch
PVC pressure mains to
existing gravity mains
E/One Sewers saved this community of 1,300
(and growing) more than $1,000,000 to date.
Average annual maintenance costs are less than
$30 per home – 30% below projections.
The Solution
A Spectacular Resort and Retirement Community
• 3,500 homes built around 11 lakes
• Estimated population of 5,000
• Four golf courses
Fairfield Glade Today
“We run careful economic studies for each new sewer
distribution project. Study factors include: first cost, tap
cost, maintenance cost, and interest. Having the option
to use low pressure sewers has saved the Fairfield
Glade community in the neighborhood of $1,000,000
over the past 13 years.”
“We saved over $1,000,000
over the last 13 years…”
Thomas V. Swaford VP, Engineering
Fairfield Glade, Inc.