Frequently Asked Questions
Questions
we are asked about appropriate use
Why
is drainage so important for healthy grass?
Why
not just use a traditional French drain?
How
does Multi-Flow compare to other products with a similar shape?
Why is drainage needed under synthetic
turf?
What
is the link between drainage and West Nile Virus?
How
heavy a load can Multi-Flow bear?
Just
how does artificial drainage work?
Questions
we are asked about installation
Why
Narrow Trench Installation Technology (NTIT™)?
What
kind of equipment is needed to install a Multi-Flow system?
How
wide a trench is required?
How
deep should the trench be?
Should
the trench be lined with a fabric?
What
should be done with the water after it has been collected?
What
are the requirements of a transport system?
How
does Multi-Flow connect to round pipe?
How
can Multi-Flow collector lines tap into a rigid pipe transport
system?
How can Multi-Flow collector lines tap
into a corrugated pipe transport system?
What if the transport pipe is substantially lower than the collector
system?
Can I insert an inspection port?
What
is to be done when there is a sidewalk, patio, or other obstruction
in the path?
Will
Multi-Flow work effectively where there is little or no grade?
How
can I install multiple levels of Multi-Flow?
What
should be used to backfill the trench?
If
the recommended backfill medium is not available, should another
drainage system be selected?
Can
Multi-Flow be installed horizontally?
Should
rain gutters be attached to a Multi-Flow system?
Other
questions we occasionally hear
What
sizes does Multi-Flow come in?
What
lengths does Multi-Flow come in?
Is
a Multi-Flow system something a homeowner can install or is a
contractor required?
Where
can I find the closest installer?
Does
Varicore provide design assistance?
Is
it possible to over drain?
Will
backfill choices affect Multi-Flow’s warranty?
Will
cold temperatures affect Multi-Flow's performance?
Is
a Multi-Flow system compatible with natural, sustainable or green
landscapes?
How
do I get hold of a free product sample?
Does Varicore make any suggestions about the drainage of my site?
Drainage
Applications
[A]
Athletic Field Drainage
[B]
Baseball Field Drainage, Basement Drainage, Bike Path Drainage,
Bocce Court Drainage, Boulevard Drainage, Bunker Drainage
[C]
Campground Drainage, Cart Path Drainage, Cemetery Drainage, Commercial
Drainage, Concert Site Drainage, Construction Site Drainage
[D]
Desaturation Project Drainage, Driveway Drainage
[E]
Earthen Dam Drainage
[F]
Fairway Drainage, Flower Garden Drainage, Football Field Drainage
[G]
Golf Course Drainage, Golf Green Drainage, Green Landscape
Drainage, Greenhouse Drainage
[H]
Highway Drainage, Horse Paddock Drainage
[J]
Jogging Path Drainage
[L]
Landfill Site Drainage, Landscape Drainage, Lawn Bowling Green
Drainage, Leach Pile Drainage
[M]
Mine Drainage
[N]
Nursery Drainage
[O] Open
Play Area Drainage, Orchard Drainage
[P]
Parking Lot Drainage, Pasture Drainage, Paver Drainage, Playground
Drainage
[R] Railroad
Drainage, Rail Yard Drainage, Residential Drainage, Retaining
Wall Drainage, Rough Drainage, Runway Drainage
[S]
Soccer Field Drainage
Questions we are asked about appropriate use
Why
is drainage so important for healthy grass?
Walking on, maintaining, or driving over soil that is saturated
will compact the soil by forcing suspended soil particles into
air voids. This will make the surface hard and uneven as well
as inhibiting healthy plant growth. Soil that is saturated or
lacking in voids will not yield healthy grass.
(See
also Is it possible to over drain?)
Why
not just use a traditional French drain?
Multi-Flow is a modified and improved French drain. Multi-Flow,
employing Narrow Trench Installation Technology (NTIT™),
has several important advantages over an old-fashioned French
drain:
Extended
life of the drainage system. Coarse sand will dramatically
extend the life of any filter wrapped drainage system. However,
it is very difficult to replicate the sand filter when constructing
an old-fashioned French drain. Because of this, French drains
routinely decrease in efficiency until they blind altogether,
often within a few years. It is easy to surround Multi-Flow
with very coarse sand backfill.
Less
surface disruption. In renovation settings, there is
a huge advantage in using the small equipment required in installing
the Multi-Flow system rather than the large equipment used to
construct a conventional French drain.
Cost.
The Multi-Flow system requires only a 4-inch trench. This saves
on the cost of excavation and backfill bringing the overall
cost down well below that of other French drains.
More
discussion about French Drains
More discussion about NTIT
How
does Multi-Flow compare to other products with a similar shape?
Frequently we are asked what advantages Multi-Flow has
over other panel-shaped drains. We will share some of the more
obvious differences. We encourage you to check out the information
provided by other manufacturers on their web sites to compare
for yourself.
We
would like to point out four Multi-Flow advantages.
- Superior
Flow Rates –Multi-Flow products are capable of
carrying water away at about twice the rate of would-be rivals.
Flow rates for Multi-Flow’s 6-inch products are generally
comparable or superior to the 12-inch products of other panel
drains.
- Functional
Connectors – The Multi-Flow system provides simple
effective ways to connect Multi-Flow components to other Multi-Flow
components as well as connections to corrugated or rigid pipe.
Other panel shaped systems provide a very limited selection
of connectors and many of these appear to be second-rate at
best. These manufacturers are reluctant to show their fittings
on-line.
- Integral
Flow Channels – Most panel drains consist of
posts or cuspates wrapped in filter. They may have the appearance
of egg cartons wrapped in cloth. Water is supposed to flow between
the posts or cusps. These flow areas are dramatically reduced
in size when, due to intrusion and compaction, the filter is
forced into interspatial areas . Multi-Flow has enclosed flow
channels which are not susceptible to the same problem.
- Uniform
Strength – Pillar type panel drains measure their
strength applying perpendicular pressures. Under such conditions
they yield results similar to Multi-Flow. They do not respond
nearly so well when diagonal pressures are applied. In real
world situations, however, pressure is seldom from an exclusively
perpendicular direction. Multi-Flow exhibits strength, regardless
of the direction of the pressure.
Why
is drainage needed under synthetic turf?
Competition in the synthetic turf field construction business
has become very intense. This has resulted in pressure to cut
engineering corners. Some designers have even omitted drainage
systems from their designs in an effort to further reduce costs.
The shortsightedness of this strategy is not always immediately
visible.
Typical
synthetic turf installations position the turf over a layer of
stone aggregate (frequently two to three layers of stone aggregate,
increasing in size from top to bottom) which in turn rests on
a dense clay base separated by a geotextile liner. Water landing
on the turf soon seeps through to the clay. From there it slowly
moves toward a collector trench where an under drain collects
it and carries it away. The stone aggregate is capable of holding
large amounts of water. Seldom does a field receive so much rainfall
that it exceeds the holding capacity of the stone and water begins
ponding on the surface.
However,
if the water is allowed to remain on the clay base for extended
periods of time, the base begins to disintegrate. A saturated
clay base will retain less than half of its original load bearing
strength. As the foundation loses its structural integrity, the
surface sags, bows and ripples. A drainage system located on the
geotextile liner provides the water a rapid avenue of escape,
thereby protecting the vital base from saturation. The durability
of a synthetic turf field depends on an excellent under drain.
A
Multi-Flow drainage system provides this excellent under turf
drainage. Because of its shape it need not be trenched. It is
also strong enough to avoid collapse and provides excellent flow
rates.
See
also:
Applications/Athletic
Fields;
Engineering/Design
Assistance/Athletic Fields;
Engineering/Details and Plans/Synthetic
Turf Field
Installation/Athletic
Fields
What is the link between drainage and West
Nile Virus?
West Nile Virus is the most common mosquito borne disease in the
U.S. Last year 9,862 cases were documented – 720 in Texas
alone.
According to the Center for Disease Control web site:
Even one bite can transmit West Nile Virus or other diseases.
While you're enjoying the outdoors, remember:
- Eliminate
mosquito breeding sites.
- Use
mosquito repellent.
-
Install or repair screens.
- Support
community-based mosquito control programs.
Of course Multi-Flow isn’t about to deliver mosquito repellent
or repair your screens but it certainly  can
help establish a mosquito-free environment. By providing an escape
route for standing water in and around backyards, athletic fields,
golf courses, playgrounds, horse paddocks, etc., Multi-Flow eliminates
the breeding grounds mosquitoes need in which to multiply. Water
should not be allowed to stand in stagnant puddles for more than
two days. Responsible and effective drainage should be the first
line of defense in the war against West Nile Virus and other insect
borne diseases.
How
heavy a load can Multi-Flow bear?
Multi-Flow will deflect only 20% when a force of 6,000 pounds
per square foot is applied, but there will be no change in its
water flow properties. In other words, you can apply 6,000 lbs/sq/ft
of force and still expect a full flow from the system. Multi-Flow
has been tested to 10,000 lbs/sq/ft where it demonstrated ovaling,
but no significant reduction in rate of flow.
See
also:
Engineering/Technical Properties
Just
how does artificial drainage work?
The
open trench is the most basic model for an artificial drainage
system. |
Artificial
drainage
Artificial drainage is the removal and relocation of excess
soil water. Once soil has reached the point where it is
holding all the water that it is capable of holding, additional
water from rain or irrigation will pond on the surface
or flow to a lower point. A drainage system provides a
passageway for excess water to escape through as it leaves
the saturated area.
Consider
the open trench
For the most basic model of a drainage system, picture
for a moment a field that is crisscrossed by narrow trenches.
Water from neighboring saturated soils or from puddles
on the surface will seep into these trenches and flow
from the area. Drainage products hold the walls of the
trench open while allowing the surface to be covered.
Gravity
rules!
Like natural drainage systems, artificial drainage systems
rely on gravity. They cannot draw water "uphill."
Therefore, drainage systems are dependent on continuous
natural or created slope. Water flows to a lower point
whenever a lower point is available.
|
Multi-Flow
provides you with the most effective collector system. |
Collection
and transport
Modern artificial drainage systems are comprised of:
- collector
lines to gather the water
- a
transport system to carry the water away
Multi-Flow
is the preferred collector system while smooth, rigid
pipe provides the most reliable transport system.
When
planning the layout of Multi-Flow collector lines, consider
these factors:
- Drainage
lines that are spaced more closely together provide
a more thorough and rapid response. In many situations
10 foot spacings are ideal.
- Drainage
lines that are placed closer to the surface will generally
respond more quickly. Drainage lines that are placed
deeper will generally drain a wider area but will
take a longer time to do so.
|
 |
- Soil
particle size will dramatically affect the speed at
which water moves through the soil. Coarse, loosely-packed
soils allow for fast water movement. Fine, compacted
soils yield water at a slower rate. Placing collectors
closer together and closer to the surface is helpful
in porous soils because water in these soil types
reaches the collectors quickly and extra carrying
capacity is required. It is helpful in dense soils
because closer spacings mean that water need not travel
so far to get to the collectors.
- Soil
is often not uniform. Layers of clay or hard pan will
affect the flow of water significantly.
- Collector line length is often limited by the carrying
capacity of the product. For example, if you wish
to be able to stay ahead of one inch of rainfall per
hour, and you have installed 6-inch Multi-Flow (capable
of carrying 1020 gallons per hour) on 12 foot centers,
the line should not exceed 136 feet in length. (One
square foot of water one inch deep is .623 gallons.
136 X 12 X .623 = 1017 gal.)
|
Questions
we are asked about installation
Why
Narrow Trench Installation Technology (NTIT™)?
NTIT™ is the most significant innovation in drainage technology
since the advent of plastic pipe. It was developed in response to
dissatisfaction with the failure rate and labor intensity of traditional
French drains. This drainage philosophy combines convenience and
efficiency to generate a better result.
NTIT™
assumes that a drainage system will be minimally disruptive, display
an expanded surface area, exhibit a generous flow capacity, and
have a long life expectancy.
minimal
surface disruption-- NTIT™ requires the drainage
medium to exhibit a narrow profile requiring less trench width.
expanded
surface area – The drainage medium is not only
narrow but also tall resulting in far more surface area than traditional
round pipe. More surface area provides more opportunity for water
to enter the flow channels, thereby increasing drainage efficiency.
generous
flow capacity -- NTIT™ requires that the drainage
medium contain unobstructed round flow channels for the rapid
removal of collected water.
long
life expectancy – Perhaps the most important feature
of NTIT™ is its longevity. A tall thin drainage medium in
a narrow trench can easily be backfilled with sand. Sand is an
excellent filter. By preventing clay and silt from reaching the
geotextile filter of the drainage product sand dramatically extends
the life of the drainage system.
More discussion about French Drains
What
kind of equipment is needed to install a Multi-Flow system?
Typically a 4 inch wide chain trencher is used to dig the trenches
required for the installation of Multi-Flow. Ancillary equipment
might be shovels, utility vehicles, wheelbarrows etc. No heavy construction
machinery is usually required in the actual installation process.
For larger projects, Great Lakes Inter-Drain, Inc. makes a lightweight
tractor trencher that collects the excavated material. The AFT 45
is ideal for remedial work on athletic fields or golf courses.
How
wide a trench is required?
A minimum 4 inch wide trench is recommended. This allows for approximately
1.5 inches of sand filter on either side of the drainage product.
How
deep should the trench be?
Trench depth varies with the application; however as a rule of thumb
the trench should be as deep as the desired water level. In many
near surface applications, only the top several inches of soil needs
to be desaturated. In this case the top of the Multi-Flow product
will be placed 2 to 6 inches from the surface.
Should
the trench be lined with a fabric?
No, Multi-Flow comes ready to drop into an open trench. Do not use
any additional fabric to line the trench. This would expose the
Multi-Flow system to the same risks French
Drains face.
What
should be done with the water after it has been collected?
Prior to designing a drainage system an adequate location for the
outlet must be established. Examples might be city storm drains,
a ditch or other low-lying area, or in some cases even the city
streets. There may be situations were there is no alternative but
to use a dry well. Dry wells are basically a void in the earth sometimes
filled with large rock. Because they have a somewhat fixed capacity,
dry wells are a last choice as an outlet location for a drainage
system. If a pump is being used to transfer the collected water,
calculate the maximum volume of water. (Length X Width X .623)
What
are the requirements of a transport system?
Transport systems need to be able to carry water away from the site
as fast as the collector system can accumulate it. Furthermore,
the transport system must be at least as strong as the collector
system. PVC, ABS, and dual wall corrugated HDPE pipe are good options.
Flow
rate requirements will vary depending on the number of collector
lines that are being fed into a given transport pipe. 6-inch, 12-inch,
and 18-inch Multi-Flow collectors are capable of delivering 17,
29, or 45 gallons per minute, respectively. Multiply the number
of collector lines times the appropriate gpm to determine the maximum
expected rate.
Designing
transport systems for athletic fields
Designing transport
systems for golf courses
Designing transport systems
for horizontal landscape installations
Designing transport systems for
vertical landscape installations
How
does Multi-Flow connect to round pipe?
Customers attach Multi-Flow to a wide variety of round pipes. Corrugated
single wall, corrugated double wall, PVC, ABS, Schedule 10, Schedule
40, Schedule 80, straight pipe, pipe with bell, flanges, etc. Obviously
Multi-Flow will attach differently to each.
There are a number of options for converting Multi-Flow to round
pipe.
- Side
outlets are used when tapping into the side of a longer run
of Multi-Flow and discharging at 90 degrees to the Multi-Flow
- End
outlets are placed at the end of the drainage system and discharge
the collected water into a round pipe in a straight line.
- Multi-purpose
connectors (Especially 0600M, 1200M, and 1800M) are used when
high volumes of water are anticipated, a water proof connection
is desired, and there is room for an elbow or tee below the
collector level.
Side
outlets and end outlets are available for all three Multi-Flow
drain system formats. The 12 and 18-inch connectors have a 4.95
inch inside diameter bell. The 6-inch connectors have a 3.95 inch
inside diameter bell. After the facing membrane has been cut away,
the outlet can be inserted into a pipe; or a round pipe can be
inserted into the outlet. The fit will depend on what type of
round pipe is being used.
6-inch
connectors will fit snugly over a 3-inch PVC Schedule 40 bell
or loosely into the bell of a 4-inch Schedule 40 PVC. 12 and 18-inch
connectors will fit over the bell of a 4-inch Schedule 40 PVC.
If
the pipe is smaller than the outlet, it is advisable to cut the
opening in the membrane to accommodate the pipe size and style
that will be used. Always cut the opening at the bottom of the
membrane.
For
certain diameter round pipes it is convenient to insert the outlet
bell into the round pipe. The stub of the outlet can be scored
or slotted to accommodate this insertion.
In
all cases, 2-inch PVC tape should be used to prevent sand infiltration
during the backfilling of the trench. Use of the end outlet and
side outlet does not result in an exact fit.
In
many cases the best option is to discharge from the bottom of
a multi-purpose connector. All of the Multi-Flow multi-purpose
connectors such as tees, wyes, crosses can be used as bottom outlets.
3-inch PVC elbows and tees can be used for these connections.
They make for an exact and waterproof fit. Pipe cement will make
the connection permanent.
 |
 |
| Multi-purpose
connectors can be used vertically as bottom outlets connecting
to 3-inch PVC. |
Multi-purpose
connectors can also be used horizontally.
|
|
A
12-inch side outlet slips over 4-inch PVC.
A 6-inch end outlet slips into 4-inch PVC.
Cut the membrane to the desired size with a utility
knife.
A 3-inch bell slips into a 6-inch outlet.
Tape all connectors to prevent infiltration.
|
How
can Multi-Flow collector lines tap into a rigid pipe transport system?
How
can Multi-Flow collector lines tap into a corrugated pipe transport
system?
| As
with rigid pipe, there are a variety of ways that a corrugated
transport pipe can be tapped. The use of in-line tees and saddle
tees are common methods. Varicore manufactures the Corru-Tap
connector made especially for this purpose.
Before
explaining that method, a word of caution is in order. Varicore
strongly encourages the use of PVC pipe for a transport system
due to its strength. Corrugated pipe, especially the single
wall version, does not possess the crush resistance of the
Multi-Flow collectors. It would be unwise to engineer for
strength in the collection system and settle for weakness
in the transport system. Dual wall corrugated pipe is less
risky.
Having
said that, we know that there are times when a corrugated
transport system is already in place or it has been specified
on a project. With that in mind, the Multi-Flow Corru-Tap
provides a cost effective and time saving method for converting
from a Multi-Flow collection system to a corrugated transport
system.
When
Multi-Flow is installed horizontally, such as under synthetic
turf, a 06CTH or 12CTF is used. This is far superior, on the
one hand, to the common practice of simply emptying the collector
lines into a rock filled trench allowing it to find its own
way into the perforated transport. It is far easier than installing
a tee in the transport line.
The
00CTV will connect to any Multi-Flow multi-purpose connector
and is usually used in vertical situations. This vertical
Corru-Tap connects to any Multi-Flow multi-purpose connector.
An extension can be used if the transport is located at a
much lower elevation.
Corru-Taps
provide a soil tight, but not water tight, fit. Since it is
entering a perforated pipe, a water tight fit is unnecessary.
The Corru-Tap is typically suitable for 8 to 18-inch dual
wall pipe.
Instructions for installation
1.
Select and mark the center of the correct spot on the top
of the transport pipe to install the Corru-Tap.
2.
For a soil tight fit, cut a clean hole in the pipe using a
hole saw. Use a 3 7/8 -inch hole saw for 06CTH and 00CTV Taps
or a 4 7/8 -inch hole saw for a 12CTH.
3.
Insert the Corru-Tap into the hole until the locking tabs
engage.
4.
In horizontal applications, Multi-Flow pipe is connected directly
into the Corru-Tap. In vertical applications, the Corru-Tap
will receive any multi-purpose connector or a pipe extension.
|
|
 |
 |
| For
a soil tight fit, use a 3 7/8-inch hole saw for 06CTH
and 00CTV Taps or a 4 7/8-inch hole saw for a 12CTH. |
The
Corru-Tap can be rotated to any angle. A 45 degree angle
is the most common approach. |
|
 |
| Insert
the Corru-Tap until locking tabs engage. In this illustration
a 0600M has been attached. |
|
What if the transport pipe is substantially lower
than the collector system?
A PVC riser pipe can be connected to the bottom of any
multi-purpose connector. The length of this riser is indeterminate.
In situations where settling is anticipated, a flexible rubber boot
is recommended. The rubber boot will provide flexibility in the
event of shifting above or below.
Can I insert an inspection port?
Inspection ports can be installed above any multi-purpose connector.
A 3” Female Adapter with Plug, Part #ABS01,
connects to the multi-purpose connector using a piece of 3-inch
PVC the length required to reach the surface. Inspection ports could
be used to flush a system, to monitor water flow, to mark line locations,
or more commonly, to satisfy curiosity.
What
is to be done when there is a sidewalk, patio, or other obstruction
in the path?
Assuming it is not possible to cut through the obstacle, Multi-Flow
can be connected to an end outlet, connected to a short piece of
round pipe that runs under the object, and then connected back to
another end outlet which is attached to the continuing line of Multi-Flow.
See:
Engineering/Details
and Plans/Under Obstacle
Will Multi-Flow work effectively where there
is little or no grade?
Artificial drainage makes use of gravity to relocate unwanted water.
Gravity pulls the water down the grade, the length of the trench
(drainage system) to the outlet. If the trench does not slope downward
to one end, then water will only move after it builds up in the
trench, and it will move much more slowly than it would if there
were slope to the trench. It is advisable to maintain .5% to 1%
minimum slope in the drainage system. (.0005 - .001 gradient or
6 to 12 inches of fall for each 100 feet of length)
How
can I install multiple levels of Multi-Flow?
Multi-purpose outlets and connectors (e.g. 1200M
and 12009 can be coupled together using
a 3” to 3” couple (ABS05) In
larger volumes, Varicore can custom manufacture connectors to accommodate
multiple lifts. Multiple lifts are sometimes needed in highway drainage
along steep slopes, behind retaining walls, and in other specialty
settings.
What should be used to backfill the trench?
Selection of a suitable backfill medium is critical for the proper
performance and longevity of any drainage system. The backfill medium
serves as a primary filter to screen out silt and clay that might
eventually clog the drainage system.
Fine
and very fine sand may slow down the inflow of water and may even
pass through the filter. Larger aggregates, on the other hand, will
not do an adequate job of filtering.
"Very
coarse sand" is recommended as backfill medium for drainage
products. According to the USDA system of classification, very coarse
sand has an approximate particle size of between 1.0 and 2.0 mm.
When
passed over sieves very coarse sand will have:
-
less than 5% retained on a #10 U S standard sieve
-
less than 5% passing a # 30 U S standard sieve
-
No more than 1 % pass through a # 50 U S standard sieve
Should
it be necessary to deviate from this recommended backfill material
due to lack of availability or other constraints placed upon the
drainage system design, a reduction in the life of the drainage
system can be anticipated.
A more
complete discussion about selecting
backfill can be found in the engineering section.
If
the recommended backfill medium is not available, should another
drainage system be selected?
Obviously we would not want to see installers backfill Multi-Flow,
or any other drainage product for that matter, with native soil.
The system would quite likely suffer premature failure. The customer
might then blame the drainage product instead of the real culprit,
the fines, for that failure.
The
backfill recommendation above is not exclusive to Multi-Flow drain
products, but is a practical guideline for any drainage system design
where silts or fines are present, and longevity of the system is
desired. Experienced drain installers agree that backfilling with
native soil or poor sand is a dangerous practice.
We
know that sometimes customers must settle for less than the very
best. Any kind of select backfill is to be preferred over the native
excavated soil. Multi-Flow's size and shape makes premium backfill
a more realistic possibility than in a French drain system. However,
that is only one of many attractive Multi-Flow features. Superior
strength, increased surface area, faster flow rates, better quality
filter, professional and speedy service, and an unparalleled connector
system all combine to put Multi-Flow head and shoulders above the
competition with or without the very best backfill. It would be
unfortunate if someone chose to install an inferior drainage product
because of the illusion that it could be safely backfilled with
inferior backfill.
Can
Multi-Flow be installed horizontally?
For certain special applications it may be advisable to install
Multi-Flow in a horizontal orientation. Examples might be: golf
course greens, synthetic turf athletic fields, playgrounds, and
larger planter boxes. There are several connectors made specifically
for this type of installation: the 6-inch Horizontal Double Wye
(06016), the 6-inch Horizontal Cross (06018),
the 12-inch Horizontal 90 degree (1201N),
the 12-inch Horizontal Tee (12017), and
the 12-inch Horizontal Cross (12018). The
Multi-Purpose single sided coupler (0600M,
1200M, and 1800M)
and several other standard connectors can also be used in this type
of application. Installers must pay special attention to maintaining
a fall of elevation when installing horizontally.
Should
rain gutters be attached to a Multi-Flow system?
Great care has been taken to prevent silts and other fines from
entering the Multi-Flow drainage system. Water emitted from rain
gutters often contains foreign material that is unwanted in a drainage
system. Rain gutters should be connected to a solid PVC pipe and
directed away from the structure. Many times Multi-Flow can also
have its outflow connected to the same PVC pipe. Not only might
roof debris block the system, but excessive roof water might be
deposited against the footings or basement walls.
Other
questions we occasionally hear
What
sizes does Multi-Flow come in?
Multi-Flow comes in three sizes: 6-inch, 12-inch, 18-inch nominal
heights. (Actual heights are 6.75”,12.15”, and 18.9”)
All three have a width of approximately 1.25 inches.
What
lengths does Multi-Flow come in?
Multi-Flow comes in either 25-foot rolls, or 150-foot rolls. The
25-foot rolls are generally shipped UPS or Fed Ex to homeowners
for small applications. The 150-foot rolls are shipped via common
carriers to your job site. Varicore does not offer any discounted
pricing on 25 foot rolls. In areas served by distributors, 25 rolls
are not always available.
Is
a Multi-Flow system something a homeowner can install or is a contractor
required?
Many homeowners do choose to install their own drainage system.
The homeowner’s time and ability along with the scope of the
job will determine whether it is appropriate to call a contractor.
If the homeowner decides to install the Multi-Flow, it will require
the right tools and supplies, such as a trencher, a method to measure
grade, sand, and shovels. A "Ditch Witch" or "Dingo"
type trencher can usually be rented from a local rental for $20-$25
per hour. A laser level is also useful and can be rented for about
$25 for half a day.
Where
can I find the closest installer?
Any qualified drainage contractor can install Multi-Flow. For smaller
jobs, irrigation or landscape contractors may be a better choice
because the Multi-Flow system does not require any of the heavy
earth moving equipment usually associated with drainage. Varicore
has compiled a list of experienced contractors. It may contain a
contractor in your area. The list is contained in the attached PDF.
Contractor
List PDF
Does
Varicore provide design assistance?
Varicore can provide drainage pattern drawings made specifically
for your site. We also assist customers with material take-offs
and performance estimates from those drawings. These are not official
construction drawings. Because we cannot typically be on site to
measure elevations etc., drawings will not contain such information.
These drawings are provided to customers without charge for use
in planning and budgeting.
Is
it possible to over drain?
Drainage cannot and will not remove all water from the soil. It
only reduces it from an unacceptable "saturation point"
to the desired level of "field capacity." At this point,
water clings to surrounding soil particles which refuse to yield
any more moisture to gravity. In situations where there is grass
or other plants, these plants can still access this remaining soil
water. Due to plant usage, combined with evaporation, soil moisture
levels will eventually fall to a "wilting point" at which
time additional water becomes mandatory.
Will
backfill choices affect Multi-Flow’s warranty?
Multi-Flow's warranty is not affected by backfill choices. Varicore
Technologies guarantees that each roll of pipe leaving our factory
meets the high standard laid out on our product specification sheet.
Choice of backfill and installation techniques will in no way affect
this warranty. Varicore manufactures the highest quality drainage
products. So, it encourages the end user to insist on installation
practices that insure the longest possible life and the highest
level of performance from the drainage system.
Will
cold temperatures affect Multi-Flow's performance?
The core of the Multi-Flow product is made of high density polyethylene,
a material that is much more resilient than PVC or other materials
when dealing with expansion associated with frost. There have been
no problems related to cold temperatures associated with Multi-Flow.
As with any drain system, if water is trapped in the system, it
can freeze up with ground frost restricting flow until it thaws.
With multiple passageways, it is unlikely that water will stand
in all of the tubes. Installing with a continual gradual fall is
the best insurance against such an event.
Is
a Multi-Flow system compatible with natural, sustainable or green
landscapes?
Green
landscaping or greenscapes are evidence of a strong trend in the
landscaping industry. These landscapes are creative, aesthetically
pleasing and environmentally sensitive. They contain few, if any,
mowed areas; utilize more native plants; and generally provide extensive
shade. These areas usually require at least some artificial drainage.
Urban areas frequently are left with dense, difficult-to-drain soils.
It is impossible to establish and maintain a variety of native plants
in wet or saturated areas. Furthermore, soil water management is
an essential tool in preventing soil erosion. Saturated soils are
prone to destabilization and movement.
Ideally,
water that is collected on-site should be used on-site. This is
often accomplished by establishing ponds and other water features
and by using collected water for irrigation and other outdoor uses.
Multi-Flow
is an ideal drainage product for use in green landscapes for at
least three reasons:
- Multi-Flow can be installed with minimal disruption to surrounding
landscape features. This is especially helpful within the cozy
confines of greenscapes.
- A Multi-Flow system will provide longevity. This is important
because as the green landscape becomes well established, replacement
of the drain system becomes increasingly difficult and expensive.
- A Multi-Flow system will provide prompt and effective drainage.
How
do I get hold of a free product sample?
We
will send you a small section of our 6-inch Multi-Flow upon your
request. Call, fax or e-mail us and we’ll send one your way.
For large projects, samples of other products are available as well.
Does
Varicore make any suggestions about the drainage of my site?
Athletic
Field Drainage
- Engineering/Design
Assistance/athletic fields
- Installation/athletic
fields
- Engineering/CAD
Downloads
- Applications/athletic
fields
- Projects/athletic
fields
- FAQS/Why
is drainage needed under synthetic turf ?
- Model
Specifications/athletic fields
Baseball
Field Drainage
- Engineering/CAD
Downloads/Baseball diamond
- Projects/athletic
fields/ SBC Park
- Projects/athletic
fields/Alvin Community College
- Projects/athletic
fields/Loyola Academy
- Projects/athletic
fields/Hamilton Sports Fields
-
Engineering/Design Assistance/athletic fields
- Installation/athletic
fields
- Applications/athletic
fields
Basement
Drainage
- Projects/residential/Willmar
- Engineering/CAD
Downloads/foundation
-
Engineering/Design Assistance/landscapes
- Applications/residential
- Installation/landscaping
Bike
Path Drainage
- Applications/recreational
areas
- Engineering/CAD
Downloads/turf to pavement
- Design
Assistance/paved surfaces
- Installation/paved
surface
Bocce
Courts Drainage
- Applications/athletic
fields
- FAQS/Why
is drainage so important for healthy grass?
Boulevard
Drainage
- Engineering/CAD
Downloads/median
- Projects/Commercial/Sims
Creek
- Projects/paved
surfaces/City of Auburn
Bunker
Drainage
- Engineering/CAD
Downloads/bunker
- Engineering/Design
Assistance/golf courses
- Installation/golf
courses
Campground
Drainage
1.
Applications/recreational areas
Cart
Path Drainage
- Engineering/CAD
Downloads/cart path
- Engineering/Design
Assistance/golf courses
- Installation/golf
courses
- Engineering/CAD
Downloads/turf to pavement
Cemetery
Drainage
1.
Applications/commercial
2. Installation/landscapes
Commercial
Drainage
1.
Applications/commercial
2. Projects/commercial
3. Installation/landscapes
Concert
Site Drainage
1.
Applications/recreational areas
Construction
Site Drainage
1.
Applications/commercial
2. Applications/civil
3. Engineering/CAD
Downloads/details
Desaturation
Projects
1.
Projects/civil/Poplar
Island
2. Applications/civil
Driveway
Drainage
1.
Engineering/CAD
Downloads/turf to pavement
2. Applications/paved
surfaces
3. Projects/paved
surfaces
4. Design Assistance/paved
surfaces
5. Installation/paved
surface
Earthen
Dam Drainage
1.
Applications/civil
Equestrian
Center Drainage
1.
Applications/recreational areas
2. installation/landscapes
Fairway
Drainage
1.
Engineering/Design Assistance/golf
courses
2. Engineering/CAD
Downloads/details
3. Installation/golf
courses
4. Applications/golf
courses
5. Projects/golf courses/Spyglass
6. Projects/golf courses/Eagle
Creek
7. Projects/golf courses/Carnmoney
8. Projects/golf courses/Stony
Creek
Flower
Garden Drainage
1.
Applications/residential
2. Installation/landscapes
Football
Field Drainage
- Engineering/CAD
Downloads
- Projects/athletic
fields/ American River
- Projects/athletic
fields/Rockford
- Projects/athletic
fields/St. John’s
- Projects/athletic
fields/Loyola Academy
- Projects/athletic
fields/Hamilton Sports Fields
- Engineering/Design
Assistance/athletic fields
- Installation/athletic
fields
- Applications/Athletic
fields
Golf
Course Drainage
1.
Engineering/Design Assistance/Golf
Courses
2. Engineering/CAD
Downloads/details
3. Installation/golf
courses
4. Applications/golf
courses
5. Projects/golf
courses
Golf
Green Drainage
1.
Engineering/Design Assistance/golf
courses
2. Engineering/CAD
Downloads/details
3. Installation/golf
courses
4. Applications/golf
courses
5. Projects/golf courses/Shaganappi
Green
Landscape Drainage
1.
FAQ's/Compatibility
2. Applications/residential
3. Installation/landscapes
4. Engineering/Design
Assistance/landscapes
Greenhouse
Drainage
1.
Applications/horticulture
2. Engineering/Design
Assistance/landscapes
3. Installation/landscapes
Highway
Drainage
1. Design Assistance/paved
surfaces
2. Installation/paved
surface
3. Engineering/Model
Specifications/paved surfaces
4. Application/paved
surfaces
5. Projects/paved surfaces/City
of Auburn
6. Projects/paved
surfaces/Nova Scotia
7. Projects/paved surfaces/County
Road #1
Horse
Paddock Drainage
1.
Applications/recreational areas
2. Installation/landscapes
Jogging
Path Drainage
1.
Applications/ recreational areas
Landfill
Site Drainage
1.
Applications/civil
Landscape
Drainage
1.
Engineering/Design Assistance/landscapes
2. Installation/landscapes
Lawn
Bowling Green Drainage
1.
Applications/athletic fields
Leach
Pile Drainage
1.
Applications/civil
Mine
Drainage
1.
Applications/civil
Nursery
Drainage
1.
Applications/horticultural
Open
Play Area Drainage
1.
Applications/athletic fields
Orchard
Drainage
1.
Applications/horticultural
Parking
Lot Drainage
1. Design Assistance/paved
surfaces
2. Installation/paved
surface
3. Projects/paved surfaces/parking
lot
4. Applications/paved
surfaces
5. Engineering/CAD
Downloads/under pavement
Pasture
Drainage
1.
Applications/recreational drainage
Paver
Drainage
- Engineering/CAD
Downloads/horizontal
- Installation/landscapes/horizontal
applications
- Engineering/Design
Assistance/landscapes/horizontal installations
Playground
Drainage
- Applications/recreational
drainage
- Projects/recreational/Central
- Engineering/Design
Assistance/landscapes/horizontal applications
- Installation/landscapes/horizontal
applications
Railroad
Drainage
1.
Engineering/Design Assistance/railroads
2. Applications/civil
Rail
Yard Drainage
1.
Applications/civil
Residential
Drainage
1.
Applications/residential
2. Projects/residential
3. Engineering/Design
Assistance/landscapes
4. Installation/landscapes
5. Engineering/CAD
Downloads/details
Retaining
Wall Drainage
1.
Engineering/CAD
Downloads/retaining wall
2. Engineering/Design
Assistance/landscapes
3. Installation/landscapes
Rough
Drainage
1.
Applications/golf courses
2. Installation/golf
courses
3. Engineering/Design
Assistance/golf courses
Runway
Drainage
1.
Applications/civil
2. Design Assistance/paved
surfaces
3. Installation/paved
surface
Soccer
Field Drainage
- Engineering/CAD
Downloads/soccer field
- Projects/athletic
fields/ Esther Shriner
- Projects/athletic
fields/Loyola Academy
- Projects/athletic
fields/Hamilton Sports Fields
- Engineering/Design
Assistance/athletic fields
- Installation/athletic
fields
- Applications/athletic
fields
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