| Product(s): | SewerCAD, StormCAD, CivilStorm, SeweGEMS, PondPack | ||
| Version(s): | 08.11.XX.XX and higher | ||
| Area: | Output and Reporting |
How can I see the depth over rise (d/D) ratio for a conduit, or the q/Q ratio?
The D/d or depth over rise, is shown in the result field "Depth (Average End) / Rise" field, or in some versions, "Depth/Rise (%)". This shows how full the pipe is based on the depth of the pipe (average over the length of pipe) for a particular time. It is expressed as a percentage of the full pipe rise (the height, which is the diameter for circular pipes). It is a more accurate representation of how full the pipe actually is, since pipes are not always flowing at normal depth.
The q/Q would be the result "Flow / Capacity (Design)" - this is the ratio of the flow in the pipe to the theoretical capacity based on the Manning equation. The Design Capacity is the same as the full flow capacity unless you have specified a custom part full design constraint for the constraint based design feature. "Capacity (Full Flow)" (and "Capacity (Design)") is the flow through the pipe if normal depth were equal to the top of the pipe. Basically, if the pipe were flowing under normal depth, which is the theoretical maximum flow through the pipe before it becomes surcharged. It is important to note the actual calculated pipe depth may not be at normal depth, so results can sometimes be at-odds with this capacity figure. For more on this, check the article in the "See Also" section below.
If you're looking for the maximum depth over rise (max percent full), this field is available as a result starting with the Select Series 5 version 08.11.05.58 release and titled "Depth (Average End)/ Rise (Maximum) (%)". In the CONNECT Edition version the field is titled "Depth (Maximum)/ Rise (%)". This represents the maximum depth at any point in the conduit at any time.
Pondpack - note that for PondPack, the conduit element does not include a Depth over rise result. In this case (assuming the Routing Method is set to Modified Puls) you can right click on the Conduit, choose Graph, then check the box for "Elevation", to view the start (upstream-side) water surface elevation over time. Observe the time when the Elevation is the highest, then compare to the Rise (or diameter) of the conduit.
Why does the profile for the system appear to be at odds with the results for the capacity?