We will use a pond as a mitigation structure and compare the results from 6 control scenarios. They are differentiated in terms of the Rating Curve of the RouteReservoir and the DPSI (i.e. Available impervious area depression storage) of the StandHyd.

Scenario Name Rating Curve Name DPSI (mm)
Post-20mm-48hr-detention 20mm-48hr 1
Post-20mm-48hr-detention-10mm-IA 20mm-48hr-10mmIA 11
Post-25mm-48hr-detention 25mm-48hr 1
Post-25mm-48hr-detention-10mm-IA 25mm-48hr-10mmIA 11
Post-30mm-48hr-detention 30mm-48hr 1
Post-30mm-48hr-detention-10mm-IA 30mm-48hr-10mmIA 11

To create the first control scenario, i.e. “Post-20mm-48hr-detention”, duplicate the scenario “Post” by clicking the Duplicate button in the Project Manager and rename it as “Post-20mm-48hr-detention”. Then, add a RouteReservoir command and adjust the model layout as below.

Once the first control scenario is created, simply use the Duplicate button in the Project Manager to create and rename the rest 5 control scenarios. In the end, in the Project Manager, there are 8 scenarios under the Drainage Network Scenarios group.

Rating curves of pond

We use 48-hrs 20 mm, 25 mm and 30 mm rains to size the pond. For example, the Rating Curve “20mm-48hr” is sized under 48hr 20 mm rain for the scenario “Post-20mm-48hr-detention”, and “20mm-48hr-10mmIA” is sized under 48hr 20 mm rain for the scenario “Post-20mm-48hr-detention-10mm-IA”. The similar naming rule is applied to the other control scenarios.

The rating curves can be obtained from single-event simulations. For your exercise, please find the single-event model “…/model/solution/Detention Ponds – Single-event.voprj” and refer to tutorial – Sizing a Pond Using the Route Reservoir Command

You can find the rating curve for each control scenario in the sheet “Rating Curve” of the Excel file “…/data/Cross Section and Rating Curve.xlsx”. Simply copy and paste them to each scenario to continue the exercise for the rest of this tutorial.

For example, in the scenario “Post-20mm-48hr-detention”, select the RouteReservoir command on the Schematic view. Click the button next to the field Rating Curve in the Properties tab to open the Discharge Storage Editor window.

Open the EXCEL file and copy the corresponding rating curve table without header by Ctrl+c.

Go back to VO. Click on the first cell under the DISCH column in the Discharge Storage Editor window. Paste the copied table to the Discharge Storage Editor by Ctrl+v.

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