how traditional water harvesting structures were made? Also draw a suitable diagram to explain these harvesting system. What is the main role of these harvesting system?

Traditional water harvesting systems are made to store the rain water, so that it can be used for many purposes like for watering the fields, for bathing, for cattle etc. In these harvesting systems rain water which falls on the roof of a house is collected in an underground tank through a rain pipe. From the tank, water is purified and reused. Some examples of underground tank are: Small pits, earthen dams, sand and limestone reservoirs. All these are made up of cemented walls.
For diagram you can refer this link:- http://www.rainwaterharvesting.org/Rural/Traditional3.htm

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Rain water harvesting is a process by which we conserve rain water. The rain water is stored for reuse before it goes down the drain and gets wasted. The water which falls on the roof of a house is collected in an underground tank through a rain pipe. From the tank, water is purified and reused. Some of the rain water harvesting systems include: Small pits, lakes, earthen dams, sand and limestone reservoirs, and rooftop water collecting units. some of them are explained below:

Khadins:

The traditional rainwater harvesting method used in Rajasthan is based on the principle of harvesting rainwater in farmlands.

In this method, saturated water is used for crop production and the surface run-off water is harvested for agriculture.

This method mainly consists of an earthen embankment (known askhadin), built across the lower slopes of the hills.

A cemented wall (known askhadin bund) is built to hold the water in thekhadin.

Dams:

Dams are constructed across rivers to control the flow of water in them. The lock-gates in dams are used for checking and controlling this flow of water.

Rooftop rainwater harvesting:

In rooftop rainwater harvesting, the water storage tank is always installed below the ground level

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Rain water harvesting is a process by which we conserve rain water. The rain water is stored for reuse before it goes down the drain and gets wasted. The water which falls on the roof of a house is collected in an underground tank through a rain pipe. From the tank, water is purified and reused. Some of the rain water harvesting systems include: Small pits, lakes, earthen dams, sand and limestone reservoirs, and rooftop water collecting units. some of them are explained below:

Khadins:

The traditional rainwater harvesting method used in Rajasthan is based on the principle of harvesting rainwater in farmlands.

In this method, saturated water is used for crop production and the surface run-off water is harvested for agriculture.

This method mainly consists of an earthen embankment (known askhadin), built across the lower slopes of the hills.

A cemented wall (known askhadin bund) is built to hold the water in thekhadin.

Dams:

Dams are constructed across rivers to control the flow of water in them. The lock-gates in dams are used for checking and controlling this flow of water.

Rooftop rainwater harvesting:

In rooftop rainwater harvesting, the water storage tank is always installed below the ground level

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