Water sharing plans articulate the rules by which water is distributed to various users.
Water sharing rules
Water sharing plans were developed for a range of widely differing rivers and aquifers. Some of the issues considered in forming water sharing rules include:
- instream values, such as threatened fish that are likely to be affected by flow extraction
- hydrologic stress – the amount of water extracted relative to river flow
- extraction value – the economic value of using the extracted water
- economic dependency of the local community on water extraction
- sensitivity of estuaries to the removal of fresh water
- NSW Government policy.
Indicative access rules were firstly developed by balancing the instream values with the economic dependence of local communities on extraction. The greater the risk to instream values the stronger the environmental flow rules. The higher the economic dependency the less stringent the access rule. Where economic dependency and instream values are both high, more intensive management is proposed.
In the water sharing plan the stress from all upstream extraction is compared with the instream values to determine a set of preliminary water trading rules. Trading is not allowed into water sources that have high instream value. Trading is also limited in stressed water sources so as not to increase pressure on the river.
To help customers implement the provisions of a water sharing plan, a series of rule sheets have been developed.
Water sharing plans are prepared as Minister’s plans under Section 50 of the Act. The first water sharing plans were developed in 2004
Water sharing plans for groundwater specify:
- water sources covered by the plan
- environmental water provisions
- requirements for water for basic landholder rights
- requirements for water for extraction under access licences
- limits to the availability of water – specified as long-term average annual extraction limits (see 3.5) and groundwater storage extraction limits
- limits to the availability of water – available water determinations
- rules for granting access licences
- rules for managing access licences
- rules for water supply work approvals
- access licence dealing rules
- mandatory conditions on access licences and water supply work approvals
- rules on how the plan may be amended.