Question

What are the advantages of rahat system

Answer 1

.. it was necessary to form some type of water collection system. In some cases a moat has been used to collect water that was then taken directly to the fields via buckets and placed over the crops. In other forms wells were used to keep water contained to draw on it. 
The Rahat System of irrigation requires a large well in which a wheel is used. The wheel is turned by oxen, buffalo or cows to get the water out of the well and then spread out over the crops. 
Modern day irrigation lays pipes in the ground so that the water is spread over crops when a valve is turned and the water is allowed to flow. In the Rahat System, the oxen were used to make the water flow into buckets that could then be dumped evenly over the crops.
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Answer 2

Answer:

it is the best way for water transport