The edit panel for the Water Account yield analysis type is shown in "Figure: Yield Analysis Tab - Water Supply Yield View". The process for setting up a Water Account Yield Analysis proceeds from the top down in the edit panel.

Figure: Yield Analysis Tab - Water Supply Yield View

  1. Water Account—Select the water account for which you want to compute the maximum yield. In order for there to be anything in the list to choose from, you must have—1) created a Water Account Set with at least one water account in it, and 2) selected that water account set on the operations tab of this yield alternative. See "2024-05-08_16-58-31_.Selecting a Water Account Set v3.5" for further details.
  2. Tolerance—this is the water account storage Tolerance used for the determination of the water account yield analysis convergence. The storage tolerance defines how close to zero the water account's storage must reach to be acceptable for the analysis. If the computed minimum water account storage in a given iteration is above the tolerance, it is a failed iteration. Both the flow and storage tolerance criteria must pass in the same iteration for the water account yield analysis to reach final convergence.
    Select "Demand" Rule to Maximize—You must select a minimum limit or specified limit type rule attached to the water account to maximize its firm yield. This rule may be a Release Function rule, Downstream Control Function rule, or Hydropower rule. Like Steps 1-3 in the process of setting up a Reservoir Yield calculation, Steps 3-5 are for selecting a rule category, filtering, and selecting the demand rule. However, since each water account can only have one rule attached to it, there will only be one rule available to choose.
  3. Rule Category Radio Buttons—select the rule category that matches the rule attached to the water account (most likely Water Supply Rules).
    1. Water Supply Rules—minimum or specified Release Function and Downstream Control Function rules.
    2. Hydropower Rules—system and local Hydropower rules
  4. Filter—these boxes allow you to filter the list of rules based on Location (reservoir), Rule name, or Rule Type. This step is not needed for the Water Account Yield option.
  5. Highlight the desired rule in the rule list and click Select. This will place your selected rule into the Selected Demand Rule table.
  6. Selected Demand Rule—set the flow tolerance for the rule.
    1. Tolerance—this is the flow Tolerance used for the determination of the water account yield analysis convergence. The flow tolerance is the maximum tolerable limit for the water account's demand rule being shorted. If the computed demand delivery in a given yield iteration is below the rule requirement by more than the tolerance, the iteration is considered "failed." Both the flow and storage tolerance criteria must pass in the same iteration for the water account yield analysis to reach final convergence.
  7. Maximum Iterations—this is maximum number of iterations that the yield analysis may perform in its attempt to converge on a solution. The default value is 25.
  8. Convergence Method—this radio button provides the choice of either Bisection Search Only or Heuristic and Bisection Search. See the previous section for a detailed description.