WaterNSW monitoring rain: Greater Sydney, regional NSW

WaterNSW monitoring rain: Greater Sydney, regional NSW

17 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 areas such as the mid-north coast and Northern Tablelands, and lighter falls more generally elsewhere.

Some river systems in the Lachlan, Macquarie and Gwydir valleys experienced flow events of varying durations, with very minor inflows into some northern supply dams.

Greater Sydney drinking water catchment

Rainfall: Across the Greater Sydney catchment falls have continued, receiving 10-20mm in most areas. The exceptions included Hambridge near Upper Avon (68mm), Picton (48mm) and Letterbox (41mm).

Inflows: Only very minor increases to inflows and storage levels are being seen. There was a minor increase in flow overnight in the Kedumba River to Warragamba Dam.

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. WaterNSW is conducting an inspection of Lake Burragorang today to assess any other potential impacts and to take samples for analysis.

Forecast: Advice from the BoM is that the rain pattern will continue in coming days, and possibly intensify again early next week. http://www.bom.gov.au/jsp/watl/rainfall/pme.jsp?ref=ftr

Regional NSW river valleys/dams

Rainfall: Heavy storm rain events on the mid-north coast (~100mm), with inland valleys such as the Gwydir and Namoi also receiving 25-50mm in some areas: Bundarra (104mm), Moree (50mm). Elsewhere lower totals were generally prevalent (10-20mm).

Inflows: Some river systems in the Lachlan, Macquarie and Gwydir valleys experienced flow events of varying durations. The full impact will be more evident in the coming 24/48 hours if rain persists.

Dams: The likelihood of significant inflows into major WaterNSW supply dams remains low, very minor inflows have been received in some northern dams: Split Rock Dam (340 megalitres ML), Keepit (76ML), and Copeton (127ML).

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 with showers and storms over coming days. http://www.bom.gov.au/jsp/watl/rainfall/pme.jsp?ref=ftr

Media contact: Tony Webber, 0428 613 478

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