Karachi is one of the famous city in the world and was the capital of Pakistan as well in the past. I have been to Karachi two years back and the problem I have found there that there is no water coming from land and the water is supplied to the city from neighbor city like Hyderabad.

sea is nearby to city and what if there is a way to use the salty water of the sea for a big city after purification.

Any ideas?

pondpro;

desalination is the obvious solution, but expensive and has other repercussions