watch more carefully from 3:50 … notice the black tubes the person is attaching to the digger. These tubes have holes and are buried. When it rains hard, water drains into the tubes and is removed away from the crops allowing the crops to grow without getting submerged or flooded.
Because your farm is smaller, you can hire people in India and dig it with a hand spade and shovel. In the USA, most farms are 150 acres or bigger and have mechanized plowing.
Good luck. if you have more questions, please do not hesitate to contact me.
Dr. Bhagyam