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Rain that fell over Sydney's water catchment areas early this week has increased dam levels by more than three per cent, the Sydney Catchment Authority says.
At 3pm today, the available storage in Sydney's water supply reservoirs was 37.0 per cent, an increase of 3.1 per cent on last week's figures, the authority said.
The increased levels are a result of runoff from falls of more than 100 millimetres across many of the catchment areas, including those for Sydney's main supply, Warragamba Dam.
Warragamba has risen 1.4 per cent to 33.9 per cent capacity, the authority said.
Up to two billion litres a day has been flowing into all the dams, providing an extra eight weeks' supply for Sydney.
And if more heavy rain falls in the catchment area in the next while, the ground is moist enough for any rain to pretty much be pure runoff. Back in 1998, Warragamba went from 68% capacity to 100% in 2 weeks.
From the Sydney Catchment Authority website:
This time last week:
During the week the following rainfall (approximately) was recorded in the catchments:
* Warragamba – 5 mm
* Upper Nepean – Less than 5 mm
* Woronora - 5 mm
* Shoalhaven – 10 mm
* Blue Mountains – 20 mm.
As at 3 p.m. Thursday, 8 February 2007, the inflow rate to Warragamba Dam was negligible and to Tallowa Dam was 20 megalitres per day.
And today's report:
During the week the following rainfall (approximately) was recorded in the catchments:
* Warragamba – 70 mm
* Upper Nepean – 175 mm
* Woronora - 140 mm
* Shoalhaven – 145 mm
* Blue Mountains – 130 mm.
As at 3 p.m. Thursday, 15 February 2007, the inflow rate to Warragamba Dam including Shoalhaven transfers was 1,750 megalitres per day and to Tallowa Dam was 1,800 megalitres per day.
Tallowa Dam (in the Shoalhaven area) is now full. It's used to supplement Warragamba.
At 3pm today, the available storage in Sydney's water supply reservoirs was 37.0 per cent, an increase of 3.1 per cent on last week's figures, the authority said.
The increased levels are a result of runoff from falls of more than 100 millimetres across many of the catchment areas, including those for Sydney's main supply, Warragamba Dam.
Warragamba has risen 1.4 per cent to 33.9 per cent capacity, the authority said.
Up to two billion litres a day has been flowing into all the dams, providing an extra eight weeks' supply for Sydney.
And if more heavy rain falls in the catchment area in the next while, the ground is moist enough for any rain to pretty much be pure runoff. Back in 1998, Warragamba went from 68% capacity to 100% in 2 weeks.
From the Sydney Catchment Authority website:
This time last week:
During the week the following rainfall (approximately) was recorded in the catchments:
* Warragamba – 5 mm
* Upper Nepean – Less than 5 mm
* Woronora - 5 mm
* Shoalhaven – 10 mm
* Blue Mountains – 20 mm.
As at 3 p.m. Thursday, 8 February 2007, the inflow rate to Warragamba Dam was negligible and to Tallowa Dam was 20 megalitres per day.
And today's report:
During the week the following rainfall (approximately) was recorded in the catchments:
* Warragamba – 70 mm
* Upper Nepean – 175 mm
* Woronora - 140 mm
* Shoalhaven – 145 mm
* Blue Mountains – 130 mm.
As at 3 p.m. Thursday, 15 February 2007, the inflow rate to Warragamba Dam including Shoalhaven transfers was 1,750 megalitres per day and to Tallowa Dam was 1,800 megalitres per day.
Tallowa Dam (in the Shoalhaven area) is now full. It's used to supplement Warragamba.
