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If the storage working volume is less than or equal to ownership tolerance level (0.0001 m³), the maximum release for an owner is:

where:       

         r_i - Owner i’s ratio share of the reservoir’s storage capacity.

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Before each owner’s share of spills can be determined, it is necessary to determine which owners will spill. Where the spill calculation returns a negative value, owners  can receive internal spill, while a positive value indicates that the owner is spilling (has filled their storage share).Based on the working volume calculation method, Equation (4) is rearranged to give an expression for the volume of water that can spill (internally and externally) from an owner’s capacity share:

where:       

         Vⁱ_max - Owner i’s maximum allowed volume of water in the reservoir this time step.

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The total external spill by all owners is known and is given by total outflow minus the total release of all owners as in:

If there is an owner which uses the 'Use Airspace' option and its spill is greater than zero, the spill is given by:

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The calculations in the previous sections established which owners are spillers when working volume based proportional losses are taken into account. The next step is to determine the internal (between owners) and external (leaving the reservoir) components of the spill by the owners excluding the owner which uses 'Use Airspace' option. This is done as the 'Use Airspace' owner does not spill internally. Based on the calculations in the previous sections, the total spill is:

Then the external spills by the owners who do not use 'Use Airspace' option is calculated and it is given by:

Case where internal spills are disabled

If internal spill is disabled the internal spill volume is zero (IS_i = 0). The ownership of the external spills is set based on how much each owner would spill in total if internal spill was operating:

Case where internal spills are enabled
When internal spills are enabled, the equations 33 to 43 are followed as in the previous version of SRG with no changes. These equations are based on the equations 9 and 10, which are in turn based on owners who do not use 'Use Airspace' option. 

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