Help with what? This data is from the UK. They traditionally have to deal mostly with too much rain as far as I know.
Same with sewage, they don't bother building the capacity, just pay off the Tories and they allow it to be pumped raw into rivers and onto shores.
It's absolutely legal to harvest rainwater in the UK for private use. Some councils even encourage it!
Source: https://www.anchorpumps.com/blog/rules-harvesting-rainwater/....
1) yes you can have a small 100l tank catching rain water for your garden, but you can not drink it. If it became a big tank it would become subject to planning and building control. 2) you need a permit to harvest ground water by digging a well or borehole. 3) you need a permit to entrap water in a pond and to build a dam for this purpose
The UK is quite wet and becoming wetter so I think it will be down to adapting to more rain but perhaps less constant.
The water distribution infrastructure is also notorious for being outdated and full of leaks...
Droughts and floods are the real issue here.
https://metofficenews.files.wordpress.com/2014/10/uk-rainfal... White is 40-45 inches. That or greater is rare, the only dark blue in England is a national park famous for its lakes and rain. The third element of too much rain is that we like to complain about trivialities.