1. How tanks were built

About a tank constructed by Krishnadeva Raya, Paes wrote :

The king made a tank-at the mouth of two hills so that all the water which comes from either one side or the other collects there; and, besides this, water comes to it from more than three leagues (approximately 15 kilometres) by pipes which run along the lower parts of the range outside. This water is brought from a lake which itself overflows into a little river. The tank has three large pillars handsomely carved with figures; these connect above with certain pipes by which they get water when they have to irrigate their gardens and rice-fields.

In order to make this tank the said king broke down a hill.....In the tank I saw so many people at work that there must have been fifteen or twenty thousand men, looking like ants.

Questions:

(i)    Explain briefly where the tank was constructed.

(ii)    Explain briefly the sources of water for the tanks.

(iii) Explain in briefly the advantages of constructing tanks.