Microproduct Data GuideIntermediate

CHMI Current Hydrology Stations

Current Czech hydrological station series from CHMI for checking measured water levels against separately documented local thresholds.

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At a Glance

Difficulty
Intermediate — some data preparation helps
Size
Tiny · ≤0.01 GB
Formats
JSON
Access
Download
API Key
Not Required
Provider
Czech Hydrometeorological Institute
Updates
Near Real Time
Last Verified
Sep 28, 2026
Source Type
Government Source
Data Terms
CC BY 4.0 with CHMI attribution.
  • Python Syntax Checked

From Source to Product Signal

Test a Product Idea in Four Steps

CHMI publishes per-station current H and Q time series as small JSON files. Start with one station used by TravelCanary. Station observations are not official warnings by themselves; check timestamps and separately sourced flood thresholds before interpreting a value.

1

Check the Setup

  • Python 3.10 or newer
  • An internet connection
  • The requests Python package
2

Access the Data

  1. 1.Read the CHMI open-data licence and current hydrology documentation.
  2. 2.Fetch one station JSON file from the current-data directory.
  3. 3.Inspect series type, unit, and the latest observation time.
Open Official Source
3

Run the Python Example

Install the packages, then run the notebook cell.

python -m pip install requests

import requests

url = "https://opendata.chmi.cz/hydrology/now/data/0-203-1-244000.json"
response = requests.get(url, timeout=30)
response.raise_for_status()
station = response.json()["objList"][0]
for series in [row for row in station["tsList"]
               if row["tsConID"] in ("H", "Q")][:2]:
    print(station["objID"], series["tsConID"], series.get("unit"),
          series["tsData"][-1] if series.get("tsData") else None)
4

Test a Useful Signal

Inspect One Czech River Station

Review one bounded current observation before flood-threshold use.

  1. 01Keep station ID, series type, unit, and measurement time.
  2. 02Check the observation age and applicable station threshold metadata.
  3. 03Explain why a measured stage alone is not an official flood warning.

Related Datasets

Dataset Details

Czech Hydrometeorological Institute is a government source. Last verified 2026-09-28. Temporal coverage: current station observations.

Data Types

Time Series

Geography

Czechia

Formats

JSON

Provider

Czech Hydrometeorological Institute

Data Terms

CC BY 4.0 with CHMI attribution.

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