The Bureau has retired the Monthly Water Update. You can find information about rainfall, streamflow, stream salinity and storages in the Bureau's Water Information, Water Data Online, Australian Water Outlook, Drought statement and Climate Summaries. If you have questions or feedback about this retirement, please contact

Monthly Water Update

small map representing the district South West Coast

South West Coast

December 2022 Summary

Rainfall was lower than average (including lowest on record) across 63 per cent of the area, spread throughout the drainage division. Total rainfall was 5 mm, 67 per cent lower than the long-term mean of 15 mm for December.

Streamflows were variable across the drainage division. Hill River - Hill River Springs had the highest streamflow for December since 1980.

Median streamflow salinity (electrical conductivity) varied between sites from 1326 to 38 241 μS/cm. Streamflows were brackish for 14 per cent of the sites and saline for 72 per cent of sites. Mortlock River - Odriscolls Farm had the highest salinity of all sites.

During December, storage volumes in all systems decreased. By the end of the month, the volume of water stored was 60 per cent of the total accessible capacity, which is three percentage points lower than the previous year.

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map visualising rainfall details


map visualising streamflow details

Streamflow salinity

map visualising salinity details

Water storages

map visualising storage details


map visualising rainfall details for South West Coast

Rainfall statistics

Rainfall decile group Percentage of area
Highest on record since 1900 0%
Very much above average 1%
Above average 3%
Average 33%
Below average 42%
Very much below average 20%
Lowest on record since 1900 1%

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