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Q100 is worked out from 3D modelling - very little of it except some of the rainfall data is from historical data.
Every home that is designed has to be hydraulically balanced with retention and soakage and tanking.
One of the reasons a lot of developers are shy from investing is the rigmarole to get the DA passed.
Upping housing density is the only way we're going to move forward - and decentralising business is probably the best way to accomplish better ecobalance.
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