However, building large infrastructure, which is the most expensive way imaginable, producing water that is very pure, but used (typically) only 2% for drinking, is very wasteful.
At any rate, that rainfall total is a hell of a resource which is being lost.
Unlicensed engineering advice from across the planet. Just what they need.
Ked is basically advocating a dam and reservoir, but just calling them other names like "berm and basin, diversion swales and check dams" Whatever you want to call a dam and reservoir, these should not be built on the cheap for public safety reasons. Dams are often the most economical solution, which is why we have tens of thousands of them in the US alone, and more built somewhere in the world every day.
With 7 feet of annual precip, it seems odd that they would need more groundwater. Relying on a groundwater system has it's own set of issues such as energy costs for pumps, chemical treatment, and the potential for ocean saltwater intrusion into the groundwater since this is right on the coast. This problem needs to be assessed by an expert, not an armchair engineer with an agenda.
