Ann: Australian Case Update - Wivenhoe, page-17

Unrelated to IMF - but topical

ALREADY topped up from flooding rain last week, Wyarolong Dam was one of four major storages spilling this morning.
Seqwater has advised this morning that Wyaralong, Hinze, Wappa and Little Nerang Dams are all overflowing as a result of heavy rain from former tropical cyclone Debbie.
There are no concerns for Somerset and Wivenhoe Dam levels at this stage.
Both are hovering around 70%, with releases from Somerset into Wivenhoe continuing.
These releases will not impact flooding downstream of Wivenhoe Dam, as water is not being released from Wivenhoe. (¿¿ Huh)
Despite forecasts of further heavy rain until Friday morning, Seqwater says floodwater releases from Wivenhoe Dam were not likely within the next 18 hours.

The Wivenhoe's catchment is 7,020 sq km's and 500 ml is falling across the catchment area.  

So at some sort of guess (1000 (metres in a kilo) X 10 (dm in a metre))² area of a sq in dm X 7120 (sq kilo's in the catchment) X 5 dm of rain in the next 24 hours = 3,560,000,000,000 litres to fall in the catchment.  

That is 3,560.0 giga litres

The Wivenhoe's size 1,156, giga litres of which only 30% is still empty. X 0.30 = 347.0 giga litres as available storage

This is barely a 1/10 of the space needed to contain this deluge.  AND IT HAS BEEN PISSING BUCKETS NON STOP!

So unless run-off is restricted, 500 ml is not broadly attained I would begin to start feel anxious.  Especially if I lived about the Brisbane river.

This time around, I live a top a high ridge.  

Last time around, in 2011 at about this time Anna Bligh said that X 3 Sydney harbours were pouring into the Wivenhoe each day, and the max they could release was X 1 Sydney harbour I realised I was in deep, deep trouble.  

Sydney harbour is 500.0 giga litres.  

So to get a feel, if the rain continues X 7 Sydney Harbours will fall into  the Wivenhoe's catchment in the next 24 hours!

Oh boy...