Water Crisis!

Seems to me that there is a simple answer to providing more water!

With industry making up the biggest users of water and drinking water making a extremely small percentage of our water supplies there is a simple answer.

Capture the water in our cities that fall on concrete buildings, footpaths and roadways! New buildings could be constructed to use the water as ballast below car parks.

While the contamination of the water by pollution, epecially from motor vehicles would make it unsuitable for drinking it would be perfect for industrial uses and in cooling towers!

There is that much water running off from our cities that I'm sure industry surrounding the cities could be adequately supplied with catchments under our cities, maybe we could strengthen current underground car parks and turn them into dams at not to much time and cost.

This could prevent the need to dam our beautiful rivers and flood people's households.

It would surely go a long way to evening up the responsiblities between country and cities with cities having to catch water as well as those in the country.

Regards
Daniel