Completing the hydraulic design in InfoDrainage

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InfoDrainage is very powerful in its ability to calculate the appropriate sizes

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and types of stormwater drainage system elements for you.

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This is why, once you have successfully imported a CAD file that was started in Civil 3D,

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you can complete the hydraulic design in InfoDrainage.

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In this example, the manholes and pipes are all set at the same level and depth, all the way down the slope.

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This is because they have not yet been designed to handle the correct amount of runoff for this area.

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To begin, review the data for the first catchment.

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Place your cursor over the catchment icon and click to open its properties.

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In the Catchment – (1) dialog box, on the Runoff tab,

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you can see that the Volumetric Runoff Coefficient has been set to 0.500,

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and the Percentage Impervious is set to 100.

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However, since this is a typical suburban development and only the hardstanding areas contribute to the percentage impervious,

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change this to 60.

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Optionally, you could perform a more detailed assessment of your subcatchments.

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You could show the background surface data for all the roads and roofs

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and then calculate the individual percentage impervious values for each subcatchment.

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But for this exercise, the average value will suffice.

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Next, enter a Time of Concentration of 5 minutes.

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Also, set the Volumetric Runoff Coefficient to 0.75.

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Again, these are typical values for these types of subcatchments.

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The main idea here is that you do not need to accept the values that Civil 3D has provided.

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You can change them to precise calculations or known values for the local area you are working on.

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Rather than edit each subcatchment one at a time, you can make all your changes in a table.

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On the ribbon, Build tab, Data panel, click Tables.

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In the Tables dialog box, select the Inflows tool.

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In the left pane, expand the Inflows node, and expand the Catchment Area node.

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The options here control what data appears in the table.

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Enable Preliminary Percentage Impervious, Preliminary Volumetric Runoff Coefficient,

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and Volumetric Runoff Coefficient.

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Then, expand Time of Concentration and enable Percentage Impervious.

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In the Percentage Impervious column, select the first cell,

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then click and drag to select all the cells.

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Then, in the toolbar, enter 60 into the box and click the equals sign (=).

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This changes the percentage impervious value for all the catchments in the model.

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Notice that it automatically set the Preliminary Percentage Impervious value to 60 as well.

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Next, select all the cells under the Volumetric Runoff Coefficient

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and change those values to 0.75.

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Notice that the Area values have all been calculated for you.

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Click OK.

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Now that the rainfall data and catchment parameters have been set up,

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you can bring these together by configuring the analysis.

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On the ribbon, Analysis tab, Critera panel, click Analysis Criteria.

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In the Analysis Criteria dialog box, select both the All and FSR rainfall studies to enable them, and then click OK.

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Next, you need to set up the preliminary sizing for the pipes.

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On the ribbon, Preliminary Sizing tab, Network Design panel, click Network Design Criteria.

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In the Network Design Criteria dialog, Flow Options tab,

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expand the drop-down and select FSR.

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Click the Design Options tab.

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Here, you can choose to set a variety of pipe options,

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including the pipe library, slope, level, backdrop, and velocity options, among others.

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For this exercise, simply accept the defaults and click OK.

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On the ribbon, Preliminary Sizing tab, Network Design panel, open the Network Design Wizard.

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On the Select Flow Path page, you determine which pipes you want to design.

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In this case, it is all of them, so click Next.

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For the Enter Flow Criteria page, again, accept the defaults for the rainfall and click Next.

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On the Enter Design Options page, accept the default options for the flow path and its network and click Next.

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Lastly, on the Summary of Changes page, you can review the changes made during the network design.

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Click Finish.

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The Network Design Report opens, to provide you with a summary of the new pipe capacities

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and flows for this drainage system.

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Close the dialog.

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Review the pipe profile again to see the changes to the flow path.

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In the Tree View, click Flow Path, then right-click it and select Show Profile.

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In the Profile – Flow Path dialog box, you can see how the design has changed.

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There is a different gradient and the pipes are different sizes, both of which indicate the system has now been hydraulically designed.

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To see the system data in greater detail, on the ribbon, Build tab, Data panel, click Tables.

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To see the pipe data, click the Connections tab.

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The table populates with the new pipe data, and specifically, the Diameter / Base Width column contains the new pipe sizes.

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Click OK.

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Now, with the design all done, save the network in InfoDrainage as Hydraulic Design,

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so that you can bring it back into Civil 3D to complete the design.