Inflow and rainfall for the first four months of the year

As of 27 April 2011, Canberra has received 234 mm of rainfall and, according to my estimates, 28,500 megalitres of inflow into our dams. This has to be an estimate, as it looks as though ACTEWAGL carried out a large release of water over the Easter break from the Cotter and Bendora dams.

This gives a megalitre per millimetre rate of about 120 megalitres per millimetre, still lower than I would have expected after our wet year.

We have had a dry April, bringing down the projections for the year to something just over 700 mm. If things transition to an el nino we may get less, however.