QGIS SWMM Convert ESTRY Layers To SWMM: Difference between revisions

== Introduction ==

This tool converts one or more ESTRY layers into a SWMM project (inp) file. It also creates a GeoPackage representation of the SWMM input data with the same name but gpkg extension and an inlet usage filename that can be used with TUFLOW-SWMM models. <br>

This tool is intended to make it easier to convert ESTRY models for use with SWMM. Some of the conversions may not be the optimal representation for SWMM. It is the responsibility of the modeller to check the final model and ensure that it is correct. Hydraulic structures in particular should be reviewed. Pump operations are not converted and must be setup manually. Weirs have a variety of options in both platforms and the automatic conversion may not be the most appropriate SWMM representation. No effort is made to convert TUFLOW operational structures to SWMM controls which must be done manually.<br>

Inlets are always specified as using the Sag option because this is how inlets are used with ESTRY. It may be appropriate to modify SWMM inlets to use the Grade option. This requires the user to provide additional information such as street cross-section and longitudinal slopes.<br>

Some model parameters are defaulted during the process. For example, default street information is created. SWMM pits (inlets) require street information even though this information is not used with the inlets as converted because they are set to use the Sag method. Pits (inlets) use the external inlet usage approach where inlet usage is written to a separate layer that is included in TUFLOW using the command <font color="blue"><tt>Read GIS SWMM Inlet Usage</tt></font>.<br>

The SWMM model parameters may need to be modified after the conversion process for the model to run stably with low mass errors.<br>

'''Note:''' ESTRY channels and links should be converted at the same time. The tool will create nodes as needed if ESTRY uses automatic nodes. <br>

Supported ESTRY layers include:

:*1D network layers (polylines or points)