Daily dam levels - weekly changes and trend for the last month. Stats updated each week (Thursday afternoon, when SCA releases data). For dam level estimate information since last Thursday, see Sydney and Warragamba Dam levels this month and Rainfall this week on Warragamba catchment and other catchments 2008-05-08 Warragamba Other Dams Overall Available GL(%) (60.05%) (88.14%) (66.11%) Weekly change GL(%) 0.55 (0.03%) -5.55 (-1.00%) -5.00 (-0.19%) Monthly change GL(%) 6.65 (0.33%) -9.15 (-1.64%) -2.50 (-0.10%) Yearly change GL(%) 518.11 (25.56%) 202.39 (36.32%) 720.50 (27.88%) The Carr government has indicated the next major change in water restrictions will take place when dams reach: 30%. This week we have 5 happy water drops and 4 sad water drops. For the month leading up to 2008-05-08 , dam levels have changed from 1711.5 GL (Gigalitres) to 1708.5 GL. Current Trends for overall dam levels At the overall rate of water loss in the past week in the dams, our supply will last 2391 days, less than 7 years and run out on 2014-11-24 . At the overall rate of water loss in the past month in the dams, our supply will last 19135 days, less than 53 years and run out on 2060-9-27 . At the overall rate of water gain in the past year in the dams, they will fill in -127866 days, less than -349 years and will overflow on julian-day-out-of-range . In order to fill the dams (Warragamba in particular) we would need around 380 mm of rain within the next couple of weeks.

Overall dam levels since November 2001 Sydney's overall dam level has gradually dropped since it was last full in 1998. This figure shows the data since November 2001 for overall dam levels. You can see this in more detail in the year-by-year figure below. This figure shows the overall dam levels for the last few years. Each line represents how full the dams are for that year. From this figure we can see that the large drops in dam levels (since November 2001) came in the second half of 2002 and first half or 2004. The rest of the time the levels appear fairly steady. As no two lines meet each other, we can say that in every 365 day period since 2001, the dam levels have gone down. Are Warragamba dam's levels dropping faster or slower than Sydney's other dams? In the following graph you can see the total amount of water available in Sydney's various dams since 2001. The thick line is the total system water available. It is obviously just how large a part of Sydney's entire system is made up by Warragamba. Since 2001 the total water in Sydney's dams other than Warragamba has remained relatively constant (whilst Warragamba's level has dropped). This is obvious from the following diagram. This difference is explained primarily by Sydney Water management primarily using Warragamba Dam water for Sydney's water needs (for several reasons). The fact that the droughts in NSW tend not to affect the coast significantly is also a factor.

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