I’d agree for a lot of places heavy on greenery… but LA? The city itself seems to have a very small percentage of greenery.

I’m assuming the rest is mostly captured via sewers just to prevent flooding.

This is true.

A better designed city could capture more.

Why is that? If it is slowed down and sunk into the earth it would add to the aquifers, no?

Going off the great book “Rainwater Harvesting in Drylands & Beyond”