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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 which drains to a Bioretention SWC, from here the site runoff is conveyed to a Dry Pond.
- Make sure you are now working in the Developed Phase
Instead of manually delineating the Inflow Area as was done in Tutorial 1, the area can be created by importing a CAD or GIS file.
Right-click the Inflows layer, and select Load Areas from CAD.
Select the Inflow Area - Dev_m.dwg file from the Tutorial Files folder.
Note Note that this file is included in the METRIC model files zipped (*.zip) folder.
The CAD file contains only the Inflow Area extents polygon. Click OK to import the area.
Select the Urb-Res-Dev Template, and then click OK. Zoom back to the previous site view by using the Previous (Previous Extents) view ribbon option found under the Plan ribbon. The Inflow Area will have been created as shown below.
- 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 Curve Number and Time of Concentrations values.
Under the Build ribbon, select the Add Stormwater Control option and then the GreenStreet Bio SWC. Move the pointer to the location on the site where the SWC is installed and use the left mouse button to draw the outline of the GreenStreet Bio (similar to the outline shown in the figure below). When you have finished drawing the polygon, use the right mouse button to end the drawing action.Note: SWC outlines can be redrawn at any point by right clicking on the SWC and selecting Replace Outline.
- Under the Build ribbon, select the Add Stormwater Control option and then the Dry Pond SWC. Move the pointer to the location on the site where the Dry Pond SWC is 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 have finished 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.
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- 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)).
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Right-click the northern edge of Green Street Bio (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 Note that the Standard Pipe and other templates can be viewed by browsing to File, Templates.
- Right-click this MH and perform the same action to connect a Standard Pipe to the northern manhole. Then add a Standard Pipe between the northern MH and the side of the Dry Pond SWC. The result should look as shown.
- To understand what elevations were 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 Greenstreet Bio and select Add Flowpath/Profile) then select the Green Street Bio 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 GreenStreet Bio SWC discharging into a standard pipe and then into the adjacent MH. We need to specify the high flow bypass weir for this facility.
Right-click within the GreenStreet Bio boundary, on the north east side 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.
Right-click the GreenStreet Bio and change the outlet type for the Bypass Trapezoidal Channel outlet to Weir, as shown in the screenshot below.
Note: If 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 on 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 Greenstreet Bio 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 Channelwhen prompted. Once added, right-click the newly added Flow Path (2) and select Rename. Change the name to Bypass Route.
Right-click the Bypass Route and select Show Profile.
- Now that we can easily see the bypass channel is not at an appropriate elevation, double-click the Connections layer within the Tree view.
- Edit the Bypass Channel Upstream Cover and Invert elevations to be as shown:
Upstream Cover Level: 564.79 m; Upstream Invert Level: 564.49 m.
- Edit the Greenstreet Bio SWC by double-clicking the icon (or by right-clicking and selecting Edit Greenstreet Bio). Use Click to Show Image in order to show a diagram of the Stormwater Control or to view various real world photos of this facility. The Depthand Side Slope are set in the template and the levels and area are calculated from the surface data (which has been pre-loaded in this model), they may also be defined by the user. The values may differ slightly depending on exactly where you have clicked during the Add Train option. No updates needed to be made to the SWC at this time.
- Manually set the Exceedence level to 564.79. Note the red text designating a manual input. Switch to the Outlets tab.
- Browse to the Outlets tab. Change the name of outlet (1) to be called Bypass. Set the Weir Crest Level to 564.491 (0.61 m above the base elevation) and set the Weir Width as 0.61 m as an initial configuration.
- Click OK to close the GreenStreet Bio.
- Edit the Dry Pond SWC. Note that by using the template, we have a 1.52 m deep pond with a top area automatically set based on how the outline was drawn. The base area needs to be set. Use the Sizing Calculator and select side slope, input 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 Pond SWC, we will have a orifice outlet to control low flows and weir control for more severe rainfall events.
- Select the Edit button above the depth-outflow table. Select the + icon, select Orifice and Weir from the list. We could manually enter some starting values for the orifice and weir or we could use the wizard calculator to help. Use thebutton to reveal the depth-flow input table. Enter the following design depth-flow values into the wizard calculator.
- Orifice: 0.61 m Design Depth; 25.4 l/s Design Flow
- Weir: 1.22 m Design Depth; 90.6 l/s Design Flow
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.
Further information about the Analysis Criteria dialog and the Rainfall Manager can be found on the given Help topic Analysis Criteria.
Run the simulation by selecting Go under the Analysis tab.
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