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Rainfall Calculator

A rainfall calculator is a practical tool that helps you calculate how much rain falls on a given area over a specific period. By using rainfall data, roof size and roofing material, you can estimate how many litres of rainwater can be collected from your roof.

Rainwater collected from a roof and directed into a water tank

Is it illegal to collect rainwater?

No, collecting rainwater is not illegal in itself. Many people collect water from roofs for irrigation and other purposes, but local rules can affect how the water may be stored and used.

Rainwater filtration with a filter and storage tank

Rainwater filtration – how it works

Rainwater filtration helps reduce dirt, particles and other contaminants before the water is stored or used. The filtration required depends on the roof, the intended use and how the system is designed.

Rainwater being collected and filtered for use as drinking water

Can you drink rainwater?

Yes, rainwater can be drunk, but water collected from a roof needs to be handled and treated properly before it is used as drinking water. Read more about what you should consider.

Collecting rainwater for garden irrigation

Collecting rainwater for garden irrigation is a smart way to make use of the water that already falls on your roof. By storing rainwater from wetter periods, it can be used later when your garden needs additional watering.

Dry ground and low water levels illustrating water scarcity and the need to plan water use.

Everything about water scarcity and what you should consider

Water scarcity can occur when the available water supply is not enough for households, agriculture, nature and other needs. The problem can be temporary or long-term and is influenced by factors such as precipitation, temperature, groundwater levels and how much water is used. By understanding the causes and planning water use, it is possible to be better prepared.

Rainwater harvesting calculator

A rainwater harvesting calculator calculator helps you estimate how much water can be collected from a roof over the course of a year. By taking location, roof area, roof material and precipitation into account, you can get a clearer picture of how much rainwater is actually available.

Collect rainwater from a downpipe – how to do it

Collecting rainwater directly from a downpipe is a simple way to make use of water from your roof. With a rain barrel, the right connection and a simple filter, you can use the rainwater for purposes such as watering your garden.

How to collect rainwater – a simple guide

Collecting rainwater is a simple way to make use of water that would otherwise run from your roof into drains or the ground. With the right roof area, gutters and storage container, rainwater can be used for garden watering and other purposes where drinking water is not needed.