21.1 Surface water allocation announcements
Allocations were relatively high in the Melbourne region during the 2010–11 year due to the wet conditions across the region. The following table shows the breakdown of allocations made in the Melbourne region during the 2010–11 year.
Entitlement volume (ML)
|High-reliability water shares||Werribee Irrigation District||10,040||100||10,040|
|Bacchus Marsh Irrigation District||3,880||100||3,880|
|Lake Merrimu direct access||190||100||190|
|Bacchus Marsh other||521||100||521|
|High-reliability water shares total||15,538||100||15,538|
|Low-reliability water shares||Werribee Irrigation District||4,777||55||2,627|
|Bacchus Marsh Irrigation District||2,030||55||1,117|
|Low reliability water shares total||7,242||55||3,983|
|Total all water shares||22,780||86||19,521|
The following table shows the breakdown of allocation announcements by month. High reliability water shares started at 8% in July 2010, and increased to 30% in August following a wet period. Wet conditions prevailed through September and October, and allocations for high reliability water shares increased to 63% and 70% respectively. Significant rainfall late in November resulted in allocations reaching 100%. This was the highest allocation since 2001–02. At the same time during the 2009–10 year, allocations were 6% of high reliability water shares.
Low reliability water shares did not receive an allocation announcement until high reliability shares reached 100% in November 2010 (as per the Werribee & Bacchus Marsh Allocation Method). The initial announcement of 10% in November was followed by an increase to 25% in December, and another increase to 45% in January 2011. A further five percent increase in February and another five percent increase in April saw the total allocation rise to 55% for the year.
|Irrigation area||Water share||2010||2011|
|Werribee and Bacchus Marsh||High reliability(%)||8||30||63||70||100||100||100||100||100||100||100||100|
The comparative year volume is 3,490 ML.