--- title: "Metric Tutorial Chapter 5 - Adding Storage" canonical: "https://help.innovyze.com/space/infodrainage2021v1/16547876/Metric%20Tutorial%20Chapter%205%20-%20Adding%20Storage" format: markdown --- | **File/s needed: ** | | --- | | Click to download the . | The network that is being designed is to enter an attenuation pond around Manhole MH14. The allowable discharge is 10 l/s. 1. Continue with your previous file or open **Completed Analysis.iddx**. 2. Save the file as **Pond Design.iddx**. 3. We are now going to open a background layer showing an outline of the pond. Right-click the CAD data in the Tree View and select the **Import Data** option.> Macro (inline-media-image) 4. Select the file **Pond Outline.dwg**. Click **Next** and then **Finish**. 5. In the **Plan** ribbon, make sure the **Snap** is switched on.> Macro (inline-media-image) 6. Select the **Surface Colour Fill** check box from the **Tree View.** > Macro (inline-media-image) 7. Go to the **Build** ribbon, and select **Add Stormwater Control > Pond**.> Macro (inline-media-image) 8. Snap the outline of the pond to the imported CAD file. 9. Right-click to finish the pond, then select the **Select **tool from the Toolbox.> Macro (inline-media-image) 10. Right-click **MH14**, and then select **Add Connection > Pipe**. Then click on the blue + that appears.> Macro (inline-media-image) 11. Connect the manhole to the pond and you will see the** **inlet appear.> Macro (inline-media-image) 12. Switch to the **Select** tool in the Toolbox. 13. Double-click the **Pond** to bring up its properties. With **Base Level **selected, enter **1.5 m** as the **Depth,** then add a row to the table at **1.5 m Depth**, entering the same **Area** of **123.51 m****2**. > Macro (inline-media-image) 14. The pond is currently straight sided but in reality a pond would have sloping sides. Select the **Sizing Calculator** (near the top-left corner of the **Pond** dialog box) and in the **Method** drop-down select **Side Slope**. Set the **Side Slope** value to 4 and then press **OK**.> Macro (inline-media-image) 15. Click **OK**. This adds sloping sides to the pond.> Macro (inline-media-image) 16. The next task is to provide an initial estimate of the size of the pond. 1. Set the **Freeboard** value to **300 mm.** 2. Select the **Sizing Calculator **again. Change the **Method** to **Quick Storage Estimate**. In the **Design up to** field, select **Freeboard **from the drop-down list. 3. Click the smaller calculator icon next to the **Volume** field. > Macro (inline-media-image) 17. For **Input Type**, we can leave it as **Use Plan Data** which automatically uses the Catchment Area details entered and the Rainfall selected for Analysis. Enter a **Discharge Rate** of **10 l/s**. Make sure that the **Safety Factor** is set to the default value of **2**. Click **Calculate**.> Macro (inline-media-image)  This returns an upper and lower estimate for the storage volume required.> Macro (inline-media-image) 18. Pressing **OK** will then take the mean of the two values and put it in the **Volume** field, clicking **OK** to the **Sizing Calculator** will update the pond dimensions. > Macro (inline-media-image) 19. Click **OK** and the outline has increased to reflect the space the pond will take up on site. You may wish to move the inlet closer to the edge of the pond to get a more accurate pipe length.> Macro (inline-media-image) 20. At this point, the original pond outline **CAD layer** can be turned off from the Tree View. 21. Right-click the main flow path (labeled **Train** if you have followed the entire tutorial) in the Tree View and select **Edit**. Add on the additional pipe from MH14 to the pond. 22. From the **Results **ribbon, select **Show Profile** and the profile view will now include a graphical representation of the pond. Update the **Diameter** of the final pipe to **375 mm **by double-clicking on the value in the table below to match the US pipe. As this was added after the **Network Design Wizard**, it has not been sized.> Macro (inline-media-image) ## Adding a Hydro-Brake® A discharge rate of 10 l/s from the attenuation pond should now be defined. 1. Use the **Select** tool to double-click the newly created pond and select the **Outlets** tab. 2. Click the + icon on the **Outlets** tab and under **Outlet Type**, use the drop-down menu to select a **Hydro-Brake®**. 3. Enter a **Design Depth** of 1.2 m and a **Design Flow** of 10.0 l/s. Press the **Calculator** then the **Calculate** button and this will run the analysis via the Hydro International Servers to calculate the appropriate Hydro-Brake, reference number and Depth/Flow relationships available. > Macro (inline-media-image) 4. Click **OK.** 5. Save the model. 6. From the **Results** ribbon, click the **Analysis Criteria** button and make sure that 18 storms are to be simulated. Also check that the model validates with no errors. 7. Click the **Go** button to simulate the model. Once the simulations have finished, the Stormwater Controls Summary will automatically open. 8. Click the **Critical Storm** button to show the highest level in the pond during any of the 18 storms. From the results we can see that the 120 minute winter storm was the worst, producing a maximum depth of 1.1 m in the pond. This is below the 1.2 m necessary to meet the freeboard and is therefore acceptable. > Macro (inline-media-image) 9. From the **Results** ribbon, open the **Connections** table and press the **Critical Storm** button. From here we can see that some of the manholes flood.> Macro (inline-media-image) 10. Save the final version of the model **Pond Design.iddx.** As a separate exercise, you may want to manually upsize some of the pipes to resolve the flooding. ## Transmit Design If you are planning on sending the design to someone (like Innovyze Support). The transmit feature is the best way to do this as it keeps together all relevant files in a compressed format. Go to **File > Transmit Design**, and then select the appropriate layers and choose the appropriate destination. And then click **OK**.  ![image](media://710ef648-8f86-4a5b-9327-4f88b7fd76fe)