All the blocks would then float up and down on the tides and currents together. Underwater framing to keep the canals between them open and navigable, bumpers to keep the outer ones from bumping too hard into stationary neighbors in a storm. Saltproof and rustproof. Photovoltaic paint, farms on the roofs, water capture systems, water tanks on the roofs in the traditional NYC style, lifestraw purification filters, all standard operating procedure everywhere in lower Manhattan. Both water and power would be semiautonomous, maybe even autonomous.
