Note: This is documentation for version 5.20 of Source. For a different version of Source, select the relevant space by using the Spaces menu in the toolbar above">Note: This is documentation for version 5.20 of Source. For a different version of Source, select the relevant space by using the Spaces menu in the toolbar above

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Within Source "Restriction Curves" are associated with a particular water storage and are used to reduce the water volumes released to users when the volume in the storage declines below a certain critical volume or water level - or a sequence of increasingly critical volumes or water levels.  In 

The “Restriction Curves” approach uses restriction levels, for example:

  • At restriction level 0, water volume released for a water user = the original allocation or entitlement  (no change)
  • At restriction level 1, water volume released to a user will be reduced to 80% of the original allocation or entitlement
  • At restriction level 2, water volume release may be reduced to 65% of the original allocation or entitlement
  • And so on … where increasing restriction levels are applied as the stored water volume decreases to lower and lower volumes

Restriction Curves provide water management rules that aim to avoid the situation where all water in the storage is used up and to extend the period when a certain minimum supply can be ensured.    Users can be informed about these rules in advance so that all stakeholders know what to expect under the range of possible conditions of water supply.   This approach is particularly relevant to urban water supply but can also be used in other water management situations ( ) .  Restriction levels are best estimated using a long historical record of daily inflow rates and water storage levels and volumes.

The restriction curves approach in Source can be applied using critical on a monthly basis

Critical volumes or water levels in a water storage associated with a restriction level can be set to vary on a monthly basis.   This is because a water storage might be expected to have lower levels at the end of a dry season because of use through this season – and this can be tolerated when an upcoming wet season is anticipated to provide inflows to the water storage to replenish the stored water volume.

the   Lets consider the situation where water users (usually larger water users) are allocated a daily water volume from a given water storage.   Water restrictions can be used to reduce 

This page has been planned for future development.

In the mean time, refer to the Restriction Curves section of the user guide for details on configuring and working with restriction curves in Source. 

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Alternatively, contact us on support@ewater.com.au.

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