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 Extreme dryDryMedianWet
Ecological watering objectivesAvoid damage to key environmental assetsEnsure ecological capacity for recoveryMaintain ecological health and resilienceImprove and extend healthy and resilient aquatic ecosystems

Management objectives

  • Avoid critical loss of threatened species
  • Maintain key refuges
  • Avoid irretrievable damage or catastrophic events
  • Support the survival and growth of threatened species and communities including limited small scale recruitment
  • Maintain deiverse habitats
  • Maintain low flow river and floodplain functional processes in sites and reaches of priority assets
  • Enable growth, reproduction and small-scale recruitment for a diverse range of flora and fauna
  • Promote low-lying floodplain-river connectivity
  • Support medium flow river and floodplain functional processes
  • Enable growth, reproduction and large-scale recruitment for a diverse range of flora and fauna
  • Promote higher floodplain-river connectivity
  • Support high flow river and floodplain functional processes
Management actions
  • Water refugia and sites supporting threatened species and communities
  • Undertake emergency watering at specific sites of priority assets
  • Use carryover volumes to maintain critical needs
  • Water refugia and sites supporting threatened species and communities
  • Provide low flow and freshes in sites and reaches of priority assets
  • Use carryover volumes to maintain follow-up watering
  • Prolong flood/high-flow duration at key sites and reaches of priority assets
  • Contribute to the full-range of in-channel flows
  • Use carryover to provide optimal seasonal flow patterns in subsequent years
  • Increase flood/high-flow duration and extent across priority assets
  • Contribute to the full range of flows including over-bank
  • Use carryover to provide optimal seasonal flow patterns in subsequent years
Key goalDamage avoidanceCapacity for recoveryMaintained health and resilienceImproved health and resilience

One example where you would use environmental demand is say, for example, a river with a flow regime that used to be dominated by high flows in late winter and early spring. Due to irrigation demands, the flow is now high in late spring – summer. For the rest of the year there has been a large reduction in flow as the city water supply is extracted at the reservoir and flows via pipe to the city. In this case, environmental flow rules need to be incorporated, so that the environmental demands can be met, even in periods where flows are low. 

Assumptions

The following assumptions are made when EDM is configured in Source:

  • Water requirements are not additive: environmental water is not consumed and as such every individual flow rule water requirement can use the same water in accounting for the success of a flow rule being met;
  • Flow rules can be co-dependent: A flow rule can be conditionally contingent on another flow rule also being met;
  • Flow rules should only be attempted if their requirements are likely to be met: The EDM determines the daily demand, however before passing the demand for this day, the EDM checks to see if the total water required to complete the rule is available; and
  • The highest priority water demand is for flow rules which have commenced but not yet completed. If a flow rule has started to be met, then the continuation of meeting this flow rule requirement has precedence over commencing water ordering to meet a new flow rule.

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