Thursday, July 31, 2014

River Derwent minor flood warning

Australian Government Bureau of Meteorology Tasmania

INITIAL WARNING

MINOR FLOOD WARNING FOR LOWER RIVER DERWENT

Issued at 1:16 pm EST on Thursday 31 July 2014
by the Bureau of Meteorology, Hobart

Flood Warning Number: 1

Minor flooding is expected to develop in the Lower River Derwent below Meadowbank Dam late Thursday afternoon following heavy rain across the catchment in the past three days.

High flows near minor flood levels will extend into the lower reaches around Macquarie Plains and New Norfolk Thursday evening.

High river levels are occurring in the Styx and Tyenna rivers with localised flooding in adjacent creeks and surrounding low lying areas possible this afternoon and during Friday.

Strong river rises have been recorded in the majority of the rest of branches and reaches along the River Derwent. Storages in the Derwent system are quite full with several dams currently spilling.

Additional 20 to 30 mm of rainfall are possible in the reminder of Thursday into Friday.

Derwent above Ouse River
Strong river rises have been recorded in the majority of the upper River Derwent, with levels expect to remain below their minor flood levels during Thursday.

Ouse River
Renewed river rises are expected to occur in the Ouse River overnight Thursday. River levels are expected to peak near their minor flood levels about Ashton and Ouse township early Friday morning.

Clyde River
Low level river rises.

Below Meadowbank Dam
Minor flooding is expected to develop in the Lower River Derwent below Meadowbank Dam late Thursday afternoon following heavy rain across the catchment in the past three days. Strong river rises will occur about Macquarie Plains this afternoon with levels expected to approach the minor flood level (4.0 metres).

Tyenna River
River levels in the middle Tyenna river peaked this morning and are now easing. Localised flooding in adjacent creeks and surrounding low lying areas in the lower Tyenna River about Westerway are possible this afternoon and during Friday.

Styx River
River levels in the upper Styx catchment peaked early this morning above the minor flood level and are now easing. Localised flooding in adjacent creeks and surrounding low lying areas in the lower Styx River are possible this afternoon and during Friday.

New Norfolk
Strong river rises will occur about New Norfolk overnight Thursday with river levels expected to peak above the minor flood level (2.0 metres) late Friday morning. Tidal variation at New Norfolk may produce localised flooding in adjacent creeks and surrounding low lying areas of the River Derwent early Thursday afternoon and early Friday morning, well in advance of the main flood arrival.

Predicted River Heights/Flows. Based on observed and forecast rainfall, the following river peak heights are predicted:
  • River Derwent below Meadowbank Dam 4.1 - 4.4m (MINOR) late Thursday afternoon 31/07/2014
  • River Derwent at Macquarie Plains 3.7 - 4.1m (MINOR) overnight Thursday 31/07/2014
  • River Derwent at New Norfolk 1.8 - 2.1m (MINOR) Friday morning 3/10/13

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 13 25 00.

For life threatening situations, call 000 immediately.

Weather Forecast: Showers.

Next Issue: By 7pm on Thursday 31 July 2014

River Heights:
Location Height of River Date/Time of Observation
Derwent River below Lk St Clair 1.92m steady 11:05 PM WED 30/07/14
Ouse River at Ashton 1.18m steady 09:30 AM THU 31/07/14
Clyde River at Bothwell 0.22m rising 12:00 PM THU 31/07/14
Clyde River at Hamilton NA NA
Derwent River below Meadowbank Dam 3.21m falling 11:00 AM THU 31/07/14
Derwent River at Macquarie Plains 2.55m rising 12:11 PM THU 31/07/14
TYENNA RIVER AT NEWBURY 1.52m steady 10:15 AM THU 31/07/14
STYX RIVER AT BRUCES BRIDGE 2.55m steady 12:07 PM THU 31/07/14
Derwent River near Bryn Estyn 3.08m steady 12:00 PM THU 31/07/14
DERWENT RIVER AT NEW NORFOLK 1.52m rising 12:19 PM THU 31/07/14

For the latest rainfall and river level information see www.bom.gov.au/tas/flood/

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