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My own feel is that plastic tanks might be more earthquake proof than ferrocement but more expensive? I would go for 8 tanks rather than 1 large one and would be tempted to use lockable manual diaphragm pumps, one on each tank if you put them into the ground or as Tim says site the tanks above ground and use lockable taps. Tim's book recommendations are sound - I used the first in DRC to produce rainwater tanks for a rural hospital. You have to ensure some filtration system to get rid of the first flush after a dry spell which would contaminate the water. Regards, Toby Gould