Home' Smart Farmer : February 2012 Contents February 2012
By JOHN HUGHES
HIS garage was prone to water
flooding in under the roller
door during heavy rain.
It was decided to install a drainage
system to divert water away using a
tractor to take care of the 'grunt'
The basic idea is to put grating in
front of the roller door, connect it to a
stormwater pit to catch any water-
born debris and then finally dissipate
the water in a soaking pit.
A channel was first cut in the con-
crete with a concrete cutter to allow
the grate drain to be installed.
The channel was cut 200 millime-
tres wider than the channel to enable
a 100mm gap on either side of the
Then a bed of packing sand was
placed in the channel - this enables
you to easily adjust the depth of the
grating relative to the existing con-
crete surface and to finetune the fall
of the grating.
The grating was installed so that it
was at least 20mm lower than the
It is interesting to note that grating
manufacturer rated this domestic ver-
sion as being able to withstand a 5-
tonne vehicle driving over it. This
would accommodate virtually all cars
and 4WDs and many small tractors.
The grating is easy to work. It came
in 1m lengths and clipped together
using silicon to seal it. One of the
lengths was cut to size with a hand-
saw to achieve the overall required
An end cap was fitted on the grat-
ing (and sealed with silicon) at the
highest point in the system.
The most important thing is to
ensure that water flows down the
drainage system and does not sit stag-
The instructions for the grating rec-
ommended 5 millimetres fall for
every 1m length of grating installed.
You can also use a spirit level or, to be
sure, pour water in the system and
see that it runs freely.
At the low end of the grate, 90mm
PVC stormwater pipe was attached to
the socket moulded into the grate.
Silicon was used to make the seal as
the plastic the grating is made from is
not compatible with PVC solvent
The PVC stormwater pipe was then
joined up to the stormwater pit.
A hole saw was used to drill a hole
in the stormwater pit to connect the
PVC pipe - this connection is also
sealed with silicon.
The stormwater pit enables water to
collect and debris to settle to the bot-
tom so it does not clog up the
drainage system further downstream.
The pit then has an exit pipe to
direct the water away. A trench was
dug with the backhoe and more
90mm PVC stormwater pipe was
You need to ensure this pipe also
has a fall.
A large hole was dug and the exit
pipe was directed to it.
Then rubble was dumped in the pit
using the tractor's front end loader.
This enables water to dissipate
underground. Using the 4-in-1 fea-
ture that opens and closes, the buck-
et in the middle makes it easier to
place a little in at a time.
The rubble consisted of broken
bricks and rocks that had to be dis-
Try to put the larger rubble in the
bottom and the smaller stuff on the
top. A thin layer of soil was then
placed on top of the rubble. A layer of
geo-fabric will prevent the soil from
clogging up the rubble.
Once all the plumbing is in place,
the grate and stormwater pit were
concreted into place.
The idea with the grate is to create
a 'drain in a drain'.
Simple method to install
effective drainage system
Use a tractor to install a
Grating installed 20mm lower than
Recommended 5mm fall for every
Plan is to create a 'drain in a drain'
1. Cut a channel in the concrete and
place packing sand in bottom.
Leeton: 42-50 Wamoon Ave
Ph: (02) 6953 7711
Griffith: 128-130 Wakaden St
Ph: (02) 6964 9999
Tyre, Wheel &
Stub Axle Packages!
• Agricultural Tyres
• Rowcrop Wheels
• Snap Lok Duals
• Flotation Tyres
& Wheels -
TOWN & COUNTRY TYRES
Call us today:
Links Archive Dec 2011-Jan 2012 March 2012 Navigation Previous Page Next Page