Poorly drained lawns – draining a lawn
Some sites aren’t naturally ideal for growing a first class
lawn on and sometimes a lawn drainage system is required to enable
the lawn to flourish. Poorly drained lawns are more often than not
the result of a heavy clay soil and poor drainage can lead to waterlogged
A poorly drained lawn will result in much reduced grass growth
and a worst case scenario is that the grass roots suffocate due
to lack of oxygen and the grass dies. Overly damp soil conditions
also encourage the growth of lawn menaces such as moss and these
can quickly take over the lawn and have a negative impact on the
vigour and strength of the lawn.
Do you need a lawn drainage system? Many lawns will not need a
drainage system installed but if your lawn is showing signs of poor
drainage then laying a drainage system can help transform your lawn.
If you don’t think that your lawn site will be prone to poor
drainage and waterlogging then you may not need to install a drainage
system. Double digging the site (dig the soil to 2 spades depths)
should be enough to enable adequate lawn drainage.
When should I install a
drainage system in the lawn? If you are creating a new lawn
the best time to install the drainage system is before you have
layed any turf / sown any grass seed. Install the drainage system
after levelling the site.
A lawn drainage system usually comprises of one or more soakaway(s)
and a drainage pipe system. A soakaway should be located at the
lowest point of your garden and should be at least 1m square and
dug to a depth of around 4-6 feet. Fill the soakaway with rubble
and hardcore (large stones / broken bricks etc) up to around 1 foot
from the surface. Add 6 inches of small stones / coarse gravel and
then add a 6 inch layer of top soil to top up the soakaway to its
Your drainage pipe system should consist of one or more main drainage
pipes (depending on the size of the badly drained area) with smaller
drainage pipes that lead into the main drainage pipe. The smaller
drainage pipes should be arranged in a herring bone pattern (alternating
either side of the main drainage pipe at around 45 degrees from
the main pipe. The main drainage pipe should lead to the soakaway.
Now we know when we and how we should take action against a poorly
drained lawn lets look at how
to install a lawn drainage system.