Rainwater Harvesting System: Components and Design

A typical rainwater harvesting system consists of the following components:

'Catchment surface': This is the surface from which the rainwater is collected. It can be the roof of a building, a paved courtyard or any other impervious surface.
'Gutters and downspouts': These are used to collect and channel the rainwater from the catchment surface to the storage tank.
'Leaf guards and filters': These are used to remove debris and contaminants such as leaves, twigs and dirt from the rainwater before it enters the storage tank.
'Storage tank': This is where the collected rainwater is stored. The tank can be made of various materials such as plastic or concrete, and can range in size from a few hundred litres to several thousand litres.
'Overflow system': This is used to direct excess rainwater away from the storage tank when it is full.
'Pump': This is used to pump the stored rainwater to where it is needed, such as for irrigation, flushing toilets or washing clothes.
'Distribution system': This consists of pipes and fittings used to distribute the rainwater to the various points of use.
'Treatment system (optional)': Depending on the intended use of the rainwater, a treatment system may be required to further purify the water. This can include filtration, disinfection or reverse osmosis.