In addition to using a target scenario to obtain peak flows for pond sizing, the Pond Sizing tool in VO also provides an alternative method. This method allows users to manually enter the desired target peak flows for sizing the pond. By following this approach, users have greater flexibility in defining specific flow conditions without relying on predefined scenarios. In this section of the tutorial, we will guide you through the process of manually entering the target peak flows and performing pond sizing accordingly.
1- Make sure you have already run the model before using the Pond Sizing tool. If you haven’t run the model, the Rating Curve will be assigned zeros as there are no existing values.
2- Open VO and navigate to the active scenario where you want to size the pond. This scenario should contain the reservoirs for which you want to determine the rating curve.
3- In the Pond Sizing tool, locate the “Runs in Active Scenario” section. To add different rows for runs, click on the 
button. Each row represents a specific run or condition for which you want to size the pond.
4- For each row, assign an available run from the active scenario. This run should correspond to the specific condition or event you want to consider for pond sizing. Select the run from the drop-down list in the “Runs in Active Scenario” column.
5- The Runs in Target Scenario column is optional in this case. You can leave it empty as it is not required when you are manually entering the target flows. This column is used when you want to retrieve the target peak flow from a scenario.
6- In the Target Peak Flow column, enter the target flow values that you want to achieve for each specific run. These values represent the desired peak flows for the corresponding runs. You can manually type the values in this column.
7- Once you have assigned the runs and entered the target peak flow values for each run, click the Run button in the Pond Sizing tool. The tool will start processing and sizing the pond based on the provided target flow values.
8- After the Pond Sizing tool finishes running, the generated sizing results will be applied to the selected reservoir in the active scenario. The Rating Curve will be updated with the new values, and the Shape of the reservoir will be set as “Unknown”, while the Discharge will be set as “Manual Input”.
It is important to note that the sizing results provided by the tool are not necessarily optimal. You may need to review and adjust the generated values based on your specific modeling conditions and requirements.
Once the pond has been sized, it is recommended to re-run the model using the updated pond properties. This will allow you to validate and make any necessary adjustments to ensure the sizing results align with your desired outcomes.
Always remember that the sizing result of the Pond Sizing tool is for reference purposes only. It is the user’s responsibility to carefully check and verify the results, considering the specific characteristics of the reservoir and the overall modeling objectives.
