Difference between Rainwater and Stormwater
Before getting into the functional differences between rainwater and stormwater, it is worth distinguishing between “rainwater” and “stormwater”. Obviously, stormwater comes from rain, so technically it can be considered rainwater. So then, you might wonder what’s the difference?
Stormwater is the water that drains off a land area from rainfall. This includes rain that falls on rooftops, directed through gutters and downpipes onto land or into drains, as well as rain falling on ground surface areas such as roads, driveways, footpaths, gardens and lawns.
Rainwater
refers only to the rain that falls on the roof, which can be harvested
into a storage tank prior to contact with the ground. Rainwater quality
is much higher, since groundwater generally contains a many more
contaminants including soil, organic matter, fertilisers from gardens,
oil residues from driveways and the like.
Stormwater pumps
are typically submersible pumps used for pumping storm water.
Stormwater is first collected in pits, detention or retention tanks from
run-off on driveways and car parks and then either pumped into the
stormwater system or to be treated.
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