This is a very basic calculation using Sydney Catchment Authority data.
On the 20th April 2006 there was no Deep Water added to the total storage amount. At this time the total storage amount was 2,385,300 megalitres.
On the 27th April 2006 Deep Water was added to the total storage amount. This increased the total storage amount to 2,584,300 megalitres.
This is an increase of 199,000 megalitres. It is this figure that is used to adjust the total storage water charts to remove the undrinkable deep water storage.
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