swmm-api 0.3.2

US-EPA-SWMM python interface

© Institute of Urban Water Management and Landscape Water Engineering, Graz University of Technology and Markus Pichler

💡 Getting started

With this package you can read INP-files, manipulate them and write new ones. You can run swmm within the python api. And you can read the RPT- and OUT-files as a pandas DataFrame for further analysis.

This package is based on the command line SWMM syntax. (see Appendix D in the SWMM User Manual 5.2)

Install the package

pip install swmm-api

... to install the package with all dependencies for macros use:

pip install swmm-api[macros]

... to install the package with all dependencies for GIS I/O use (ONLY for Linux!):

pip install swmm-api[gis]

... and to install the package with all dependencies for macros and GIS I/O use (ONLY for Linux!):

pip install swmm-api[full]

To add the GIS functionality to Windows, I recommend using python with Mamba (or miniconda or Anaconda) and run mamba install geopandas to install the GIS dependencies (see GeoPandas).

📖 Documentation

Link to the documentation of the api and some example jupyter notebook.

Alternative packages

R-language:

• swmmr / GitHub / cran

python:

• swmmio / docs / pypi / GitHub / simular to this package but more high-level approach (= slower for specific tasks)
• GisToSWMM5 / GitHub / converting gis data to swmm model (also possible with swmm_api: swmm_api.input_file.macro_snippets.gis_standard_import and swmm_api.input_file.macro_snippets.gis_export)
• swmmtoolbox / GitHub / Thanks to Tim Cera for this package! I used his package to understand the .out-files but completely rewrote the reading process in this package.
• swmmnetwork / GitHub / create graph network from swmm model (see swmm_api.input_file.macros.inp_to_graph)
• SWMMOutputAPI / GitHub / read the output file (see swmm_api.output_file.out) / (OpenWaterAnalytics)
• swmm-pandas / pypi / equal functionalities to this package, but not feature complete
• swmmout / pypi / docs / simular to swmmtoolbox and SWMMOutputAPI
• swmmtonetcdf / pypi / GitHub
• hymo / GitHub Input and Report Reader (Lucas Nguyen)
• shmm / GitHub Input Reader (Lucas Nguyen)
• swmmreport / GitHub Report Reader (Lucas Nguyen)
• swmmdoodler / GitHub

Other SWMM-related packages

python:

• pyswmm / pypi / GitHub / RTC, etc. / based on swmm-toolkit (OpenWaterAnalytics)
• swmm-toolkit / pypi / GitHub / by Michael Tryby (OpenWaterAnalytics)
• SWMM5 / pypi / GitHub / simular approach to swmm-toolkit (by Assela Pathirana)
• SWMM-xsections-shape-generator / pypi / tool to generate custom shapes (by me)
• SWMM_EA / pypi / usage of genetic algorithms with SWMM (by Assela Pathirana)
• OSTRICH-SWMM / GitHub / OSTRICH optimization software toolkit with SWMM

Read, manipulate and write the INP-File

Read the INP-File

from swmm_api import read_inp_file, SwmmInput

inp = read_inp_file('inputfile.inp')  # type: swmm_api.SwmmInput
# or 
inp = SwmmInput.read_file('inputfile.inp')
# or
inp = SwmmInput('inputfile.inp')

Getting information

from swmm_api.input_file.section_labels import TIMESERIES

# getting a specific section of the inp-file

sec_timeseries = inp[TIMESERIES]  # type: swmm_api.input_file.helpers.InpSection
# or
sec_timeseries = inp.TIMESERIES  # type: swmm_api.input_file.helpers.InpSection

# getting a specific timeseries as pandas.Series
ts = inp[TIMESERIES]['regenseries'].pandas  # type: pandas.Series

Manipulate the INP-File

from swmm_api.input_file.section_labels import JUNCTIONS

# setting the elevation of a specific node to a new value

inp[JUNCTIONS]['J01'].elevation = 210
# or
inp.JUNCTIONS['J01'].elevation = 210
# or
inp.JUNCTIONS['J01']['elevation'] = 210

Write the manipulated INP-File

inp.write_file('new_inputfile.inp')

see examples/inp_file_reader.ipynb

see examples/inp_file_structure.ipynb

see examples/inp_file_macros.ipynb

Run SWMM

Run SWMM with a specified executable.

from swmm_api import swmm5_run
swmm5_run('new_inputfile.inp', swmm_lib_path=r'C:\path\to\runswmm.exe')

Or run SWMM with pyswmm. This would be platform independent as pyswmm is compiled for all platforms. Additionally, you gain the advantage of a progress bar.

from swmm_api import swmm5_run
swmm5_run('new_inputfile.inp', progress_size=100)

swmm5 C:\path\to\new_inputfile.inp:  77%|███████▋  | 77/100 [00:03<00:01, 22.36it/s, 2007-02-16 08:46:27]

Read the OUT-File

from swmm_api import read_out_file
out = read_out_file('new_inputfile.out')   # type: swmm_api.SwmmOut
df = out.to_frame()  # type: pandas.DataFrame

see examples/out_file_reader.ipynb

Read the RPT-File

from swmm_api import read_rpt_file
rpt = read_rpt_file('new_inputfile.rpt')  # type: swmm_api.SwmmReport
node_flooding_summary = rpt.node_flooding_summary  # type: pandas.DataFrame

see examples/rpt_file_reader.ipynb

🗺️ GIS interactions

geopandas and its requirements (Shapely, pyproj, Rtree) must be installed! (not that easy on Windows)

from swmm_api import SwmmInput
from swmm_api.input_file.macros.gis import write_geo_package, gpkg_to_swmm

inp = SwmmInput.read_file('inputfile.inp')

coords = inp.COORDINATES.geo_series  # type: geoandas.GeoSeries with points for all nodes
vertices = inp.VERTICES.geo_series  # type: geoandas.GeoSeries with lines for all links
polygons = inp.POLYGONS.geo_series  # type: geoandas.GeoSeries with polygons for all subcatchments

# create geopackage of all objects in inp file
write_geo_package(inp, gpkg_fn='geopackage.gpkg', driver='GPKG', label_sep='.', crs="EPSG:32633")

# read above written geopackage and convert it to inp-data
inp_new = gpkg_to_swmm('geopackage.gpkg', label_sep='.')
inp_new.write_file('new_inputfile.inp')

⚠️ Be Aware!

As python is case-sensitive this API is also case-sensitive, but SWMM is case-insensitive. This is important for the naming of the objects. For example, you could create a junction 'a' and 'A' with this API, but SWMM would only

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This documentation will be continuously extended and enhanced. If you have any question, don't hesitate to write the author and email of create an issue on GitLab or GitHub.

MORE INFORMATION COMING SOON

Cite as

Pichler, Markus. (2022). swmm_api: API for reading, manipulating and running SWMM-Projects with python (0.3). Zenodo. https://doi.org/10.5281/zenodo.7054804