Passive Irrigation Systems

Stormwater runoff captured at the road surface flows into the kerb channel, moving downstream until it enters the MGI through an 8mm-aperture grated opening. Inside the unit, debris in the stormwater is filtered through a two-stage silt basket system (6mm and 1mm mesh). Filtered water then exits the MGI via an outlet pipe and is directed into a structural soil or soil vault system to irrigate tree roots.

The MGI features a stainless steel silt basket which uses a dual-mesh filtration system to filter out particles:
• A 6mm screen captures medium-sized litter and debris
• A 1mm mesh basket captures fine silt and small particles
This helps to prevent outlet blockages while ensuring clean stormwater reaches the tree root zone.

The lift-out cast iron solid cover and grate within the MGI is rated Class C, accepting a nominal wheel load of 5000kg. It is suitable for use in the kerb channel on roads with slow-moving commercial traffic.

The MGI is installed roadside, directly within a B2 kerb channel. It should always be installed upstream of a side entry pit, ensuring any excess stormwater during heavy rainfall events is safely captured by the municipal drainage system. The internal horizontal plate holding the silt basket is available in either a left or right option for basket placement, which is dependent on road incline and must be specified at the time of order placement. The lift-out cover and grate segments can be interchanged to suit orientation requirements.

The Monash Grated Inlet is a no-fuss solution that is simple to install, as it is supplied to site as a fully contained precast unit with all internal components already pre-assembled. The cover component is supplied in a concrete encasement manufactured with a B2 barrier-type kerb profile, which is to be installed directly within the kerb channel. The catch pit component is installed directly beneath the encased cover, and should have an outlet pipe connected to the underground soil vault system.

The MGI is designed to be a low-maintenance solution driving efficiency for councils. Typical maintenance involves:
• Inspecting and clearing debris from the catch pit and lift-out silt basket
• A recommended maintenance cycle of every 3–6 months, depending on environmental conditions. For example, leafy streets may require more frequent maintenance.

The Monash Grated Inlet features a two-part solid and grated cover that can be unbolted and lifted out using a standard industry lifting key. Once the cover is removed, maintenance crews can easily access and pull out the internal steel silt basket by hand, allowing easy cleaning of the unit.