Guardian photo montage of gated communities

[Steve]

This block must have a run-off from the roof area, this will need to be put to better use. Water can be stored on the roof but it won't run uphill, so somebody is going to have to collect it and empty it into the storage containers. I wonder if IBC containers could be pulled up the outside of the building, these have a number of advantages - they're robust and cheap, and also have a large bore outlet tap. I would suggest procuring a large bore hosepipe to fit the IBC fittings, this would allow you to douse any fires started against the block walls or inside the block. They are very heavy when full, so careful placement is important, they may have to spread around the building.

A length of drainpipe can be bolted vertically to a wall, filled with sand or suitable aggregates, used to filter the collected water.