|Click to download Advanced . ] tutorial model files|
Open the file XPD_US_Advanced_Tutorial_Start.xpdx or continue working from your previous file.
Items can be added to the plan and connected individually, or drawn as a connected Treatment Train using the Add Train tool in the Build menu. The former approach, adding items individually, will be used here. The treatment train begins with the Inflow Area of the Developed Area that drains to a Bioretention Stormwater Control (SWC), from here the site runoff is conveyed to a Dry Pond.
- If not done so already, switch to the Developed Phase by selecting from the drop-down list on the left Tree View panel. The background image will be updated and display the proposed property boundaries and building footprints.
- Instead of manually delineating the Inflow Area as we have done in Tutorial 2, the area can be created by importing a CAD or GIS file.
- Right-click the Inflows layer, and select Import from CAD.
Select the Inflow Area - Dev.dwg file from the Tutorial Files folder. Click Next.Note that this file is included in the IMPERIAL [US Units] model files zipped (*.zip) folder.
- The CAD file contains only the Inflow Area extents polygon. Click Next to import the area.
- Select the Urb-Res-Dev template, and then click Finish. Zoom back to the previous site view by using the Previous View button in the Plan ribbon. The Inflow Area will be created as shown below.
- Right-click the Inflows layer, and select Import from CAD.
- Double-click the Inflow area (or right-click and then select Edit) to edit the Developed inflow area. Note the high percent imperviousness and shorter time of concentration. No changes are required due to the use of the Developed landuse template, though the calculators could be used for assistance when making updates to the Curve Number and Time of Concentrations values.
- Now we are going to add the drainage network.
- Turn off Snap in the Plan Ribbon.
- Under the Build ribbon, select the Add Stormwater Control option and then select the Raingarden.
Move the pointer to the location on the site where the SWC will be installed and use the left mouse button to draw the outline of the Raingarden (similar to the outline shown in the figure below). When you are done drawing the polygon, use the right mouse button to end the drawing action.The SWC outlines can be redrawn at any point by right-clicking the SWC and selecting Replace Outline.
- Under the Build ribbon, select the Add Stormwater Control option and then select Dry Pond. Move the pointer to the location on the site where the Dry Pond SWC will be installed and use the left mouse button to draw the outline of the Dry Pond SWC (similar to the outline shown in the figure below). When you are done drawing the polygon, use the right mouse button to end the drawing action.
- Under the Build ribbon, select the Add Junction option and then Standard MH .
- Move the pointer to the location on the site where the first Manhole (Standard MH) is to be located and press left click to place. Repeat for the second Manhole (Standard MH(2)).
Right-click the northern edge of Raingarden (where the under drain will exit the SWC and connect to adjacent MH) and select Add Connection, choose the Standard Pipe template. Then left-click the adjacent Manhole.Note that the Standard Pipe template consists of a 12-inch diameter pipe with roughness of 0.013. This and other templates can be viewed by browsing to File >Templates.
You can continue clicking to connect the manholes and then connect into the Dry Pond.Then add a Standard Pipe between the northern MH and the side of the Dry Pond SWC. The result should look as shown.If you lose the drawing mode, right-click the MH and perform the same action to connect a 12 inch pipe to the northern manhole.
- To understand what elevations are adopted and how well the treatment system connects, right-click the Flow Paths item at the bottom of the Tree View and select Add (or alternatively by right-clicking the Raingarden and select Add Flowpath/Profile) then select the Raingarden icon and then click the Dry Pond icon. Hit the Esc key in order to stop tracing.
- Right-click the new Flow Path and select Show Profile (alternatively, select the Flow Path under View, Profiles) to display a profile of the flow path.
We currently only have the underdrain from the Raingarden SWC outfalling into a 12 inch pipe and into the adjacent MH. We need to specify the high flow bypass weir for this facility. Close the Profile view.
Note: You can turn off labels on Plan using the Display Settings.
Click to select the Raingarden stormwater control. Right-click the north eastern side of the SWC and select Add Connection. This time, select Bypass Trapezoidal Channel. When you connect this to the adjacent MH, you will see inlet options for the manhole. Either the existing inlet or a new inlet can be selected. As we are not restricting inflow into this MH from either connecting pipe, we can select the existing inlet. Press the Esc key to end drawing connections.
If the Inlets and Outlets fall outside of the SWC, the Inlet and Outlet icons will disappear automatically and the links will connect directly to the SWC icon. The Inlets/Outlets are not deleted, only removed from the graphical view, they can be redrawn by right-clicking the SWC icon and choosing the Specify Inlet/Outlet Location command.
- To view the newly added Channel in Profile, a second flow path will need to be drawn.
- Right-click the Flow Paths Tree option, select the + symbol and select the Raingarden icon and the Dry Pond icon. Since the previously traced flow path follows the underdrain of the Bioretention system, this time select the Bypass Trapezoidal Channel when prompted.
- Once added, right-click the newly added Flow Path (1) and select Rename. Change the name to Bypass Route.
- Right-click the Bypass Route and select Show Profile.
- We can easily see the bypass channel is not at an appropriate elevation, double-click the Connections layer in the Tree View.
- Edit the Bypass Channel Upstream Cover and Invert elevations to be as shown:
Upstream Cover Level: 1853 ft; Upstream Invert Level: 1852 ft.
- Click OK and the Profile view will be updated. Close the Profile.
- We will now update the elevation of the SWC to match. Edit the Raingarden SWC by double-clicking the icon (or by right-clicking and selecting Edit). Use Click to Show Image(s) in order to show a diagram of the Stormwater Control or to view various real world photos of this facility. The Depth and Side Slope are set in the template. The levels and area are calculated from the surface data (that has been pre-loaded in this model), which you may also define according to your preference. The values may differ slightly depending on exactly where you have clicked during the Build options.
- Manually set the Exceedence level to 1853.0. Note the red text designating a manual input.
- Go to the Outlets tab. Change the name of Outlet (1) to be called Bypass, and then change the Outlet Type to Weir. Set the Crest Level to 1852 (1 ft above the base elevation) and set the Width as 1.0 ft as an initial configuration.
- Click OK to close the Raingarden.
- Edit the Dry Pond SWC. Note that by using the template, we have a 5 ft deep pond with a top area automatically set based on how the outline is drawn. The base area needs to be set. Use the Sizing Calculator and select side slope, input 0.5 ft/ft (1:2 slope). We will maintain the Top Area. Select OK and note how the depth-area-volume table and associated schematic have been updated.
- Select the Outlets tab, select the + button and from the available Outlet Types select the Multiple option. As is common for a Dry Pond SWC, we will have a minor event orifice outlet as well as a major event weir control.
- We will be using the pond to control the initial runoff by allowing infiltration. This will help us achieve Runoff Reduction and prevent the Water Quality event discharge from leaving the site. Therefore, add 1 ft to the Invert Level automatically picked up as the Base Level of the Pond. This will place our outlet control 1 ft above the base, preventing any discharge until that depth is reached.
- Select the Edit button above the depth-outflow table. Select the + icon, select Orifice and Weir from the list.
- We could manually enter the starting values for the Orifice and Weir or we could use the wizard calculator to help. Use the > button next to the Control List table. Enter the following design depth-flow values into the wizard calculator.
- Orifice: 1 ft Design Depth; 0.9 ft3/s Design Flow
- Weir: 3 ft Design Depth; 3.2 ft3/s Design Flow
- Click the calculator button to solve for the displayed controls. Click each row of the Control List table to see the results. 0.5 ft has been calculated as the Orifice diameter and 0.2 ft as the Weir width.
- Click OK and see the Depth – Outflow table populated.
- Click OK to close the Dry Pond.
- Now that the Treatment Train is laid out, you can review the Analysis Criteria and Rainfall set up by browsing to the Analysis ribbon and selecting Analysis Criteria.
The default Analysis Criteria and SCS Rainfall events do not need to be updated before running the model.
Further information about the Analysis Criteria dialog and the Rainfall Manager can be found on the Help topic Analysis Criteria.
- Run the simulation by selecting Go under the Analysis tab.
- Save the file as XPD_US_Tutorial4.