WaterNSW monitoring rain: Greater Sydney, regional NSW

WaterNSW monitoring rain: Greater Sydney, regional NSW

16 January 2020

WaterNSW is monitoring the results of the rain event taking place across many areas of the Greater Sydney drinking water catchment and large areas of regional NSW.

Rain is in line with the forecasts, with heavy rain concentrated in some areas, and lighter falls across wide areas. Rain commenced in the state’s south-west on Wednesday and slowly made its way east and to the north over the past 24 hours.

Greater Sydney drinking water catchment

Rainfall: Across the Greater Sydney catchment falls have been widespread but generally less than 10mm. The exception has been the Blue Mountains with falls up to 50mm.

Inflows: At this stage the rain has not generated significant tributary flows, and inflows are likely to be negligible. Any impact will be more evident in the coming 24/48 hours.

Water quality: There are no current concerns about rain washing ash or other debris into dam storages from catchments affected by bushfires at this point. The extent of any water quality impacts on dam water will depend on the location and intensity of rainfall events.

Forecast: Advice from the BoM is that the rain pattern will continue to move towards the far north-east and Northern Tablelands.http://www.bom.gov.au/jsp/watl/rainfall/pme.jsp?ref=ftr

As at 16 January the total metropolitan dam network is at 42.6% of capacity, while Warragamba storage sits at 43.6% of capacity.

Regional NSW river valleys/dams

Rainfall: Modest falls in the vicinity of 10-20mm have occurred across the state’s Far West, south-west and north-western regions, with isolated falls of up to 40mm. Notable volumes at Tinga (44mm), Mount Palmer (48mm), Pine Ridge (45mm) and Mullaley (44mm).

Inflows: At this stage the rain has not generated significant tributary flows, although the full impact will be more evident in the coming 24/48 hours.

Dams: The likelihood of significant inflows into major WaterNSW supply dams in relatively low, though advice from the BoM is that the slow-moving weather pattern could generate localised storms of considerable intensity.

Forecast: Advice from the BoM is that the rain pattern will continue over next 24 hours or more and is move to the north-west.http://www.bom.gov.au/jsp/watl/rainfall/pme.jsp?ref=ftr

Media contact: Tony Webber, 0428 613 478

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