Today world, in which we need to make more efficient use of resources, harvesting rainwater is a good way for solving some water related issues in industrial scale. They are widely used in homes, farms, public buildings such as schools, hospitals, and hotels and many other facilities.

As urban life develops , the need for treated water increases , and so do the costs. In urban water supply systems, all water should be used to drinking water quality but only 1% of water consumption is applied for drinking. In Ireland, daily water taking rate per person is 148 litres. But , only 67 litres of this is used for personal and nutritional consumption. This shows that approximately 80 litres of water per person on a daily basis do not need to be high quality. For other purposes such as watering plants, toilet flushing, cleaning or even carwash, rain water harvesting can be a good , not expensive , and environment friendly solution.

What is the idea behind rainwater harvesting systems?

It is just ” gathering natural water in a tank” in its traditional meaning. Today , rain harvesting systems are much more efficient with the addition of a couple of components , such as pressure vessels, pumps and filters. An usual rainwater harvesting system has the next elements:

Water catch surface: this is the main element where water is caught , the starting point of the system.
Channels: to transport water from catching flat to storage tank.
Filters: these are for filtering particles in rainwater. Pumps and pressure vessels: to pressurize water and keep water pressurized. Water storage tank: this is the tank where ready-to-use water is stored .
Piping system: to transport water to the places of consumption. Although rainwater in general includes less minerals because of the air pollutants that may dissolve in rainwater, harvested rainwater may be be further treated if it is intended to be used as drinking water.

How much can you economize using rainwater harvesting systems?

The answer to this question depends on where you live , i.e. how much rain falls annually , the place of your water catch surface and your water consumption. However , to make a rough esteem , you can save for each square meter of your horizontal water catch surface each year .

Rainwater harvesting systems are proven to have a big payback and they indeed pay for themselves in a few years. After that, the more rain means the more you economize . On the other hand, if rainwater harvesting becomes more common there will also be a reduction in national costs for water treatment. Thus, it means that rainwater harvesting contributes to not just personal utility costs but also national treatment costs, which is a cost item for taxpayers.

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