Table 1 shows that at 30 June 2013 there was a surplus of available water assets over water liabilities and future commitments expected to be settled within 12 months of the reporting date.
|total water assets as at 30 June 2013||8,594,623|
|less water assets not available to be accessed, taken, or delivered:|
|less total water liabilities as at 30 June 2013||295,172|
|less future commitments expected to be settled within 12 months of the reporting date|
|expected diversions of surface water: irrigation supply
|expected diversions of surface water: urban supply||1,000
|expected diversions of surface water: individual users
|expected extractions of groundwater: urban supply
|expected extractions of groundwater: individual users
|Surplus/deficit of available water assets over water liabilities and future commitments expected to be settled within 12 months of the reporting date||7,610,276|
Expected diversions, extractions, and releases of water are based on abstractions made during the 2012–13 year; however, it is estimated that the volume of surface water diverted for irrigation may increase by approximately 80,000 ML next year when water supply to the Goomig farmlands commences in 2014 (see Water overview).
Future water commitments in the Ord region are likely to be met by future water inflows. Based on recent data (last ten years), future inflows to surface water storages in the region are likely to be between 2,000,000 ML and 3,000,000 ML per year.
Contingent water assets and contingent water liabilities
a. Purpose of the note
The purpose of this note is to report on possible water asset and possible water liabilities for the region. Possible (or contingent) water assets and water liabilities arise from past events and may be confirmed if future events (customer use) that are not fully under the control of the region's management occur.
b. Contingent water assets
The Department of Water (Western Australia) sets extraction limits on groundwater aquifers to protect groundwater-dependent ecosystems. Only water above the prescribed minimum water-table level is recognised as a water asset in the account. The volume of water that is beyond this extraction limit is considered a contingent water asset for aquifers in the region; however, similar to the recognition of groundwater assets, there is currently not enough information available regarding groundwater resources in the Ord region to allow for a volumetric estimate.
c. Contingent water liabilities
Water for irrigation use (235,000 ML): The Ord Irrigation Cooperative controls the distribution of water to its members for irrigation. It is estimated that 235,000 ML will need to be delivered in the 2013–14 year. The amount of water delivered is contingent on the irrigators of the Ord Irrigation Cooperative drawing water from the system.
Water for urban use (3,000 ML): The Water Corporation of Western Australia (the Water Corporation) manages the bore fields and surface water storages used for urban water supply. The Water Corporation also maintains water within the urban water system for delivery to the towns within the Ord region; however, the actual delivery of the water is contingent on when customers use the water. It is estimated that 3,000 ML will need to be delivered in the 2013–14 year (1,000 ML from surface water and 2,000 ML from groundwater stores).
Water for private use (40,000 ML): The Department of Water allocates water to individual users (e.g. mining, industrial, and agricultural sectors); however, the actual delivery of the water is contingent on when customers use the water. It is estimated that 40,000 ML will need to be delivered in the 2013–14 year (30,000 ML from surface water and 10,000 ML from groundwater stores).