How It Works

Stormwater Systems

Stormwater Attenuation & Management

As permeable grass is turned into concrete and steel, rain has to go somewhere.

If it’s not soaking into the grass, it needs to be accounted for. Rain that used to fall on green areas now falls on paved surfaces and roofs. Our streams and rivers are under pressure from the additional run-off, as is the infrastructure of the city.

Stormwater attenuation looks at returning the situation to neutrality as if the rain was still falling on green areas, even after we’ve built homes, patios and driveways. A Civil Engineer works out the flow of water that will come off these surfaces and how much storage is required to account for the difference.

This is called Stormwater Management Area Flow (SMAF). By reusing some of the water (retention) and releasing the excess slowly into the stormwater system (detention), you can reduce the load on infrastructure and protect sensitive areas.

Watch our ‘Lockdown Your Stormwater Knowledge’ webinar.

Update yourself on new council requirements for stormwater attenuation such as SMAF Regulations in relation to medium density housing and as a result of increased coverage. We’ll also outline solutions to high invert level, discharge to curb, surcharge issues, ideas as to how to increase yields on development sites

Stormwater Attenuation

Water Detention Solutions

Stormwater detention is the process of detaining water and slowly releasing it back into the stormwater system.

Water is held (detained) long enough to control the flow of stormwater into rivers and streams, helping to protect vulnerable waterways.

As urban development intensifies, more grass is being converted to concrete and steel. The grass is permeable, but concrete and steel aren’t.

Consequently, water that was once absorbed into land is now pumped into wastewater pipes at a much faster rate and with more flow than ever before. This is why most councils now require water to be retained.

Not only does detaining water protect our streams and environment, it also helps to protect stormwater infrastructure by reducing the load on it.

Stormwater Management

Water Reuse Solutions

Inside and outside the home, water can be retained for reuse (water retention/reuse), with the excess slowly released into the stormwater system (water detention).

Stormwater is collected off roofs or other hard surfaces (just like for detention) which is then stored in a stormwater detention tank. Water is retained, instead of slowly releasing it.

This water is typically reused for non potable purposes. It can be used  outdoors to wash the car, water the garden and so on. Non potable water represents 56.1% of household use. As long as it meets the council’s sanitation requirements, water can also be harvested and used for other purposes.

Stormwater systems offers a range of Rainwater Harvesting Systems including Aquacomb’s combined water reuse and detention system.

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