That is because they are taking too much water from the source that is refilling the reservoir. Solution - take less.
I never made that claim. That is a strawman, an argument you invented because you thought it would be easier to argue.
Yep - and we have plenty of those same "look how low the reservoir" stories are here, too.
The situation in Sao Paulo is that an unprecedented drought has been in place for approximately 9 months.
There is no sign of that drought breaking.
There is no reason to expect that the drought is limited to 12 months or even 18 months. There is no way to predict the long term out look.
Why?
Because it is unprecedented!
There are no models to rely upon. Just faith and hope.
There is also ongoing long running political leadership and fidelity issues.
If we presume that the drought extends into 12 months and beyond, Sao Paulo as a major city is finished unless major and expensive infrastructure allows water to be channeled from long distances.
Billy T has referred to a personal reserve of about 90 litres which at a stretch for two people is about 40 days if you are lucky. [drinking only]
It is currently late October, total city reserves are at 3.5%, summer is on it's way.
Sao Paulo is a warm city, it' summers are normally quite hot [regardless of global warming], with a similar climate to Brisbane QLD Australia, or Zimbabwe, Africa.
Trucking in water is only a short term emergency provisioning. It is very expensive.
Here, in Australia we have a few small mining towns* that rely exclusively on imported water via tanker and the significant increased cost of living associated per capita are available if research is warranted.
Melbourne where I live went through similar but on a smaller scale, population only 2 million or so. We were lucky ! The drought broke when it did. Major infrastructure is still needed to further protect against further drought in the future or it too will eventually have to be abandoned.
Being in a major city with out water are no better than standing in a desert waiting for an aid drop.
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