If you are encountering issues with the Analyze Gravity Network command, please refer to the following list and also see
About Analyzing and Sizing a Gravity Pipe Network and ensure that the prerequisites listed in the Workflow Prerequisites section have been met.
- It is recommended that you run the
Apply Rules command on each structure and pipe in the pipe network before running the Analyze Gravity Network command.
-
A structure must exist at the start of the pipe network and it cannot be a null structure. If you select such a network to analyze, no analysis results are reported.
- Only one catchment can be associated with an inlet structure. If you need to associate additional flow with an inlet, you can add flow by specifying additional Known Q on the Tributaries page. Alternately you can model multiple catchments as one catchment using the
from objects catchment definition process.
- If the selected pipe network is data-referenced, the energy and hydraulic grade lines can be computed, but analysis results cannot be applied to the pipe network.
-
The minimum cover specified in the
Analyze Gravity Network Default Settings applies to all pipes except the most downstream pipe (connected to the outfall structure).
This may result in the outfall structure and its connected pipe appearing above ground when the surface slope is steeper than the slope of the most downstream pipe.