Geez yes I meant keep out water but I'm on mobile and not very careful! Yes, if we're talking about Hong Kong or somewhere with extremely high urbanization mayb

Geez yes I meant keep out water but I'm on mobile and not very careful! Yes, if we're talking about Hong Kong or somewhere with extremely high urbanization maybe the calculus is different, but that's a political issue more than a technical one. Every city on earth has land not utilized for living or heavy ag within a very reasonable distance.