Configuring Li-Lo Underground Tanks as a Stormwater Detention System

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Configuring Li-Lo Underground Tanks as a Stormwater Detention System

Many councils and local authorities require new homes to install detention tanks to capture and temporary hold stormwater. Once captured, this water is slowly released into the stormwater drainage network which helps to protect against flash flooding in local areas.

National Poly Industries sell Li-Lo underground water tanks that can be installed to detain the specific amount of water required by the council before letting it drain slowly back into the storm water network. This article explores how they can be setup for stormwater detention.

Stormwater Detention Tank Planning

The first question to answer is, “how much water you need to detain?” If you need to comply with stormwater detention regulations, then your council or local authority will state the amount of water to be detained and acceptable drainage rate into the storm water system. Knowing how much water you need to detain will influence the capacity of your storage tank/s.

Let us assume you need to detain 5,000 litres of storm water that is then drained slowly away. If you desire 10,000 litres of water to be retained for toilet flushing, filling washing machines and watering gardens, then a retention system comprised of three 5,000 litre Li-Lo underground tanks could be installed and configured to fulfil your needs.

Due to its shallow excavation needs and strong construction, our flat Li-Lo underground tanks are ideally suited as either a detention tank and/or a retention tank system.

Multiple Underground Tanks
Source: Graf Underground Storm Water Tanks

Installing a Li-Lo Stormwater System

The difference between using Li-Lo underground tanks in a retention system versus a detention system, can be the way in which your tanks are configured. Retention simply means your rainwater is harvested, unlike detention which means water is detained and slowly released over time.

It is possible to configure an individual tank to be used as temporary water storage that slowly drains away. The main feature of a water detention tank is the controlled flow outlet that slowly drains water from your tank until empty. It is important to also have an emergency stormwater overflow, so that if your tank becomes full water is directly fed into stormwater drainage.

Stormwater Detention Tank

With our Li-Lo tanks it is possible to use one individual tank or several tanks for a combination of both water detention and retention. Rainwater is harvested into the bottom half of the storage capacity. When full, the outflow is activated and the detention capacity becomes available for the slow-draining water detention storage.

Rainwater Retention Tank

National Poly Industries’ Li-Lo underground tanks are a great solution for stormwater detention or a combination of both rainwater harvesting and detention needs. Best of all their flat profile makes excavation and installation easy. If interested, contact National Poly Industries today to discuss your needs and receive a competitive customised quote.