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Saturday update to minor flood warning

Australian Government Bureau of Meteorology, Tasmania

Minor Flood Warning for the River Derwent

Issued at 3.29pm on Saturday 31 July 2021

Flood Warning Number 4: MINOR FLOODING MAY DEVELOP ALONG RIVER OUSE AND RIVER DERWENT BELOW MEADOWBANK DURING SUNDAY

Minor flooding may develop at River Derwent below Meadowbank Dam and along River Ouse during Sunday, based on observed and forecast rainfall. River levels are elevated in many tributaries (including the upper Derwent, Nive, Florentine, Tyenna, Styx and Plenty). Flooding is not expected to extend downstream to Macquarie Plains and New Norfolk.

In the 24 hours to 9am Saturday, widespread rainfall totals of 5 to 15 mm were recorded in the Derwent catchment, with isolated high totals up to 57 mm at Pine Tree Rivulet and 27 mm at Lake Gwendy. Since 9am, a further 5-15 mm has been recorded in northern parts of the catchment. Additional rainfall totals of 10-35 mm in elevated areas are expected for the remainder of the weekend.

Strong and dangerous flows will be a hazard over the next couple of days.

River Derwent above River Ouse:

River levels are high along the Nive River and upper Derwent River.

River Ouse:

Minor flooding may occur along the River Ouse, based on observed and forecast rainfall. Lake Augusta is spilling. The River Ouse at Ashton is currently at 1.49 metres and steady. The River Ouse at Ashton may reach the minor flood level (2.40 m) during Sunday. Current levels are not available for River Ouse at Ouse. The River Ouse at Ouse may reach the minor flood level (4.00 m) during Sunday.

Tyenna River:

River levels are easing along the Tyenna River.

Styx River:

River levels are easing along the Styx River.

River Derwent below Meadowbank Dam:

Minor flooding may redevelop along the River Derwent below Meadowbank Dam, based on observed and forecast rainfall. The River Derwent below Meadowbank Dam is currently at 3.04 metres and steady. Renewed river rises are likely during Sunday. The River Derwent below Meadowbank Dam may reach the minor flood level (4.10 m) Sunday afternoon. The River Derwent at Macquarie Plains is currently at 2.00 metres and steady. The River Derwent at Macquarie Plains is likely to remain below the minor flood level (4.00 m) during Saturday and Sunday.

River Derwent around New Norfolk:

No flooding is expected.

Flood Safety Advice:

FloodSafe advice is available at www.ses.tas.gov.au

Road closure information is available at www.police.tas.gov.au

For emergency assistance call the SES on telephone number 132 500.

For life threatening situations, call 000 immediately.

Next Issue:

The next warning will be issued by 3.30pm on Sunday 01 August 2021.

Latest River Heights:

LocationHeight of River (m)TendencyDate/Time of Observation
River Derwent below Lake St Clair2.07Steady03:15 PM SAT 31/07/21
River Ouse at Ashton1.49Steady03:00 PM SAT 31/07/21
River Ouse at 3B Weir1.13Steady03:00 PM SAT 31/07/21
River Clyde at Bothwell0.14Steady02:15 PM SAT 31/07/21
River Derwent below Meadowbank Dam3.04Steady03:05 PM SAT 31/07/21
River Derwent at Macquarie Plains2.00Steady02:42 PM SAT 31/07/21
Tyenna River at Newbury0.84Steady02:00 PM SAT 31/07/21
River Derwent at New Norfolk1.25Rising02:44 PM SAT 31/07/21

This advice is also available by dialling 1300 659 210. Warning, rainfall and river information are available at www.bom.gov.au/tas/flood. The latest weather forecast is available at www.bom.gov.au/tas/forecasts.

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