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- Launch xpdrainage and select Open Existing from the Welcome Screen. Choose the file XPD_US_Advanced_Tutorial_Start.xpdx
- The model contains four Phases, one representing the Existing site conditions, the others represent the various other proposed Developed conditions examined in the other Chapters of this Tutorial. You can switch between the Phases by using the drop-down list located in the Tree View. The appropriate site data for each Phase has been imported. You will begin by creating the Existing conditions site.
All background data (image, surface and CAD file) for both Phases have already been loaded. In order to load any of these items, right-click the appropriate layer from the Tree View and select Import Data.
Note Note that you can ignore this step in terms of the tutorial though is mentioned for your reference.
- In developing this site, we know that we are going to increase the runoff flow and volume. Therefore, we will need to design storage to handle the increase in stormwater. We are going to be using green infrastructure techniques to slow down and hold back the water. First, we are going to define the contributing area or catchment that we are draining so that we can calculate the existing flow conditions.
Before you draw the Inflow Area catchment extents, go to the Plan ribbon and select the Snap option to ensure that the vertices can exactly match the CAD file layout. Selected options/functions will be highlighted in yellow.
- Under the Build ribbon, select the Add Inflow option, and then select Urb-Res-Ex Inflow Area template from the drop-down list.
- You can now use the left mouse button to draw the Inflow extents by snapping along the CAD layout background, as shown below. When you are done drawing the polygon, use the right mouse button to end the drawing action. Hit escape to exit the drawing mode.
- Double-click anywhere in the polygon to open the Inflow Area form (or right-click and select Edit). You will see the tabbed options for entering data. The Area is automatically calculated based on the Inflow Area polygon that we traced over the scaled CAD background image file. Since the Urb-Res-Ex template is used, all the data in the tabs are populated based on values defined in the template.
Notice that the are Preliminary Sizing and Dynamic Sizing input sections. The Preliminary Sizing section is for generating the 'static' inflow Rational method (Q = C*I*A) rates and is exclusively used for Preliminary Pipe Design. The Dynamic Sizing section is for the full hydrograph hydraulic analysis, which will be performed as part of this tutorial and is most commonly used on design assessments.
- Click OK to close the dialog.
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