Prevent any problems with flooding by installing discreet drains in your garden.
Badly designed or poorly installed drains, or a lack of drainage altogether, can lead to boggy spots on the lawn or even flooding.
To avoid this, you need to have drainage in your yard that captures the water before it causes any problems.
It should run the water quickly and efficiently to a dispersion or stormwater system, but never the sewer.
With many off-the-shelf DIY solutions available, installing drainage no longer needs to be a complicated or expensive job.
TIP A great sustainable solution for surplus rainwater from small drains is to re-use it to water other parts of the garden.
Install surface drainage
To lay this low-profile drain and dispersion system, you’ll need a stringline and set-out paint, grated drainage channels, an unslotted ag pipe, end caps, premixed concrete, silicone, a trenching shovel and rubber mallet.
Step 1. Dig a trench
Set out the location for the drain using a stringline and set-out paint. Dig a trench for the drain at least 130mm deep and about 250mm wide. TIP Use a trenching shovel to dig the trench to make it easier to create a narrow channel.
Step 2. Fit end caps
Attach end caps to the drain and secure them in position with silicone sealant. If necessary, cut the drain to length with a handsaw and make
a suitably sized hole for connecting it to an output pipe. Dig another trench for this output pipe.
Step 3. Lay the drain
Mix the concrete and lay a bed in the main trench. Position the drain with the grate in place, then tamp it down using a rubber mallet, ensuring there is adequate fall towards the output end. Connect the output drain, then backfill the excavations and bring to level.
Install sub-surface drainage
For a system that catches and disperses water at its source, you’ll need a length of trench liner, end caps, drain matting and blue metal aggregate. Decorative gravel, timber edging and a drainage pipe are optional.
Local councils have very clear guidelines on drainage and handling stormwater, so if in doubt give them a call
Excavate a trench in the impacted area 100mm deeper than the height of the trench liner, and deeper if you plan to add a garden bed. The liner will allow water to disperse, but you can also fit a drainage pipe, or a slotted ag pipe if you’re adding a garden bed.
Cover the entire trench liner with drain matting, then backfill the trench using blue metal aggregate, making sure the liner is completely covered by a layer at least 30mm deep. Top the blue metal with
another layer of drain matting.
Conceal the drain by adding a layer of decorative river pebbles, constrained by timber edging. Or lay turf or put
a garden bed over the top of the drain. TIP If adding a garden bed on top, dig the drain a bit deeper to allow for soil and use shallow-rooted plants.