Questions tagged [swmm]

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1 answer
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How do I use SQL and virtual layer to draw a line from one polygon to another in the same layer?

Background: Sometimes in modelling hydrology (e.g. in SWMM) we have runon from one subcatchment area to another. These subcatchments are records in a shapefile. I want to show this situation as a line ...
Michael Kitchen's user avatar
1 vote
2 answers
1k views

Exporting EPA SWMM Model to QGIS

I want to transfer a SWMM Model to QGIS, the Subcatchments included. I have tried: Exporting the map as a .dxf File from SWMM and importing the file again in QGIS. This only transfers the Nodes and ...
egan's user avatar
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1 vote
2 answers
708 views

Making arrow from polygon centroid to point using QGIS

I would like to present in QGIS a graphical information I have in two vector layers, an arrow. One layer has catchemnt areas as polygons and the other has the outlet points. The catchment areas layer ...
Marco's user avatar
  • 3,230
2 votes
1 answer
83 views

Selecting the interior of line type data in PostGIS

I have asked about exporting geometry as a table (Link) and I got a very nice answer about how to do it with an SQL instruction. Is there a way to select only the inerior of line type data? i.e. ...
Marco's user avatar
  • 3,230
1 vote
2 answers
1k views

How to export geometry as a table in QGIS

I am trying to use Qgis to produce the input file for SWMM and the first step is to produce the geometry tables. I need to export the geometry of elements as a tables with these format: (poygons) ;;...
Marco's user avatar
  • 3,230
2 votes
3 answers
2k views

GIS integration with SWMM

I am interested in producing input files for SWMM from GIS data, hopefully from QGIS. Does any one know a free tool to do it? I found this plug-in qgis-swmm, but I do not see it in the repository of ...
Marco's user avatar
  • 3,230