Hydrological Flow Mapping — IMGW 2024

Geospatial analysis of daily river-flow observations across Poland. The notebook combines IMGW-PIB station metadata with 2024 hydrological measurements, checks which stations can be mapped, and visualises both annual flow patterns and the September 2024 flood in the Odra basin.

What it does

• Loads IMGW hydrological station metadata from JSON
• Converts station coordinates into a GeoPandas GeoDataFrame
• Loads daily flow observations for 2024
• Identifies stations missing from the API data or lacking coordinates
• Reviews the effect of excluding unmappable stations from the analysis
• Calculates mean and median flow for each station
• Maps mean annual flow across Poland using a logarithmic scale
• Compares normal median flow with maximum flow during the 13–24 September 2024 flood event

Data

Sources:

• IMGW-PIB hydrological station data
• IMGW-PIB daily hydrological observations
• Natural Earth river geometries

The notebook expects the following local files:

data/
├── danepubliczne_imgw_hydro.json          # station metadata (from IMGW API)
├── codz_2024_mod.csv                       # 2024 daily observations (from IMGW)
├── ne_10m_rivers_lake_centerlines/         # global rivers (Natural Earth)
│   └── ne_10m_rivers_lake_centerlines.shp
└── ne_10m_rivers_europe/                   # European rivers (Natural Earth)
    └── ne_10m_rivers_europe.shp

Download the files from the sources above and place them in data/ before running.

Run

pip install -r requirements.txt
jupyter lab imgw_flow_2024.ipynb

An internet connection is required when Contextily downloads the basemap tiles.

Python · pandas · NumPy · Matplotlib · GeoPandas · Contextily

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Author: Tomasz Piotrowski — LinkedIn