Monthly Water Update

small map representing the district Tanami - Timor Sea Coast

Tanami – Timor Sea Coast

December 2019 Summary

Rainfall was lower than average across 86 per cent of the area, spread throughout the drainage division. Mean rainfall was 35 mm, 65 per cent lower than the long-term mean of 100 mm for December and the seventh lowest in the past 120 years.

Streamflows were very much below average including lowest on record for 55 per cent of the sites, spread throughout the drainage division. At four sites streamflows were the lowest for December since 1980.

During December, storage volumes in all systems decreased. By the end of the month, the volume of water stored was 34 per cent of the total accessible capacity, a decrease of 27 per cent since the same time last year. Lake Argyle (Ord System), the second largest storage in Australia, dropped to 34 per cent, the lowest in the past ten years.

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map visualising rainfall details


map visualising streamflow details

Water storages

map visualising storage details


map visualising rainfall details for Tanami - Timor Sea Coast

Rainfall statistics

Rainfall decile group Percentage of area
Highest on record since 1900 0%
Very much above average 0%
Above average 0%
Average 14%
Below average 53%
Very much below average 29%
Lowest on record since 1900 4%

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