Water

Roof Water Harvesting

Water professionals all over the world are increasingly worried about the scarcity of water. According to the

UN World Water Development Report of 2003

, various factors like climate change, pollution and population growth will cause a sharp decline in the amount of water available per person in developing countries. Hence,

Domestic Roof Water Harvesting (DRWH)

is an effective source of water which meets the local water needs. Read on to know more about roof water harvesting.

What is Roof Water Harvesting?

‘Rainwater harvesting’ is a term which covers all those techniques in which rain water is collected and stored for general use. This term is allocated for those arrangements that cause rainfall to soak into the ground rather than run off the ground’s surface.

Also, it is used to even to construct small reservoirs to collect run-off water so that it can be used for micro-irrigation and cattle. Even this run-off water is collected from impermeable surfaces and from roofs. Hence, roof water harvesting is a part of rainwater harvesting which has its own importance.

Roof Water Harvesting Basics

The rain falls on roof tops and runs off. These run-offs are completely variable. For example, run-off flow is nil or zero when sufficient rainfall doesn’t take place in years. But, if the rain water is effectively channelized into small reservoirs or tanks, this stored water can be drawn whenever it is needed, irrespective of the last rainfall.

As the tank is located near the building in whose roof the rain fell on, this harvested roof water is used to supply water to the same building. There is no need for the water to be piped or carried from somewhere more distant.

The important and essential elements of a roof water system include:

  • Suitable roof
  • Water storage container
  • Channel for leading rain water from the roof to the storage container

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