Page Comparison

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V_t- The intermediate storage volume at time step t from Equation 12 or 13

Available water, Demand and Releases

The available water for an onstream farm dam can then be calculated by Equation 17 as:

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AvailableWater_t – Water available for release at time step t from Equation 21 or Equation 22

If available water from Equation 21 or Equation 22 is zero, there is no Release at this time step, as shown in Equation 23. Else, Release is calculated as in Equation 24 and Equation 25.

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If the required ReleaseVol_t is greater than AvailableWater_t as calculated in Equation 22 above, the model continues the estimation according to Equation 24, else Equation 25 is used:

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Where:

ReleaseVol_t – The Release Volume requested at time step t

ActReleaseVol_t – The actual water volume released from the farm dam for Release Volume request at time step t

V_{t- The storage volume (i.e., the available water) at time step t from Equation 21 or Equation 22}

Spill

Spill occurs if the storage volume V_t as calculated by Equation 25 is greater than Dam Capacity and Storage volume and Spill volume are calculated according to Equation 26. Else according to Equation 27:

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Where:

SpillVol_t  – The actual spill water volume from the farm dam at time step t

V_t  - The final result of the storage volume at time step t

References

¹ McMurray, D, 2004. Farm Dam Volume Estimations from Simple Geometric Relationships. Department of Water, Land and Biodiversity Conservation. South Australia. Report No. DWLBC 2004/48.