Water temperature
Drives how much oxygen the water can hold. Warmer water holds less oxygen, so fish are more vulnerable in summer. A sudden rise can indicate a warm wastewater discharge.
Reference: up to 25 °C
Đetinja Water Quality
Citizen science · Guardians of Đetinja
Volunteers of the “Guardians of Đetinja” programme regularly measure water quality at monitoring sites along the river, from Turica to Sevojno. Every reading is submitted through a form and appears on this page immediately. The data refreshes automatically, so what you see always reflects the river's latest state.
Live data
Učitavanje podataka…
River at a glance
Aggregated across all monitoring sites and all measurement dates.
How the river changes over time
Pick a parameter. Each thin line is one monitoring site; the thick dashed line is the daily average for the whole river.
Monitoring sites on the Đetinja
Click a marker to see that site's results. The number inside the marker is the total count of measurements there.
What the measured values mean
pH value
Shows whether the water is acidic or alkaline. Most river organisms survive only in a narrow band — deviations can mean pollution, but also an uncalibrated device, so it is worth repeating the reading.
Reference: 6.5 – 8.5EC — electrical conductivity
Measures how well the water conducts electricity, which depends on dissolved salts and minerals. A jump downstream of a given point is a classic sign that something is entering the river.
Reference: up to 800 µS/cmTDS — total dissolved solids
The total amount of dissolved matter. Devices usually derive it from conductivity, so TDS is typically about half the EC value — if it is not, the two values were probably swapped on entry.
Reference: up to 500 ppmNote: measurements are taken by volunteers using handheld pen-tester devices. The results are intended for trend monitoring and awareness, and do not replace official laboratory water testing.
Open data
All measurements are publicly available under the CC BY 4.0 licence — use them freely for teaching, student and scientific work, journalism or your own analysis. The only condition is attribution. The data is fully anonymous: no names, no e-mail addresses, nothing by which a volunteer could be identified.
Full dataset with metadata
All measurements, parameter definitions, sites with coordinates and computed statistics.
/api/kvalitet-vode.jsonTabular, for Excel
One row per measurement. Opens directly in Excel, Google Sheets or R.
/api/kvalitet-vode.csvFor GIS and maps
Sites as points with averages. Loads into QGIS, ArcGIS or Leaflet.
/api/kvalitet-vode.geojsonHow to use them
# Python
import pandas as pd
df = pd.read_csv("https://biorider.rs/api/kvalitet-vode.csv")
df.groupby("naziv_mernog_mesta")["ph"].mean()
# JavaScript
const r = await fetch("https://biorider.rs/api/kvalitet-vode.json");
const { merenja, statistika } = await r.json();
# R
df <- read.csv("https://biorider.rs/api/kvalitet-vode.csv")Licence: CC BY 4.0 · Required attribution: BioRider — Green Mobility CSO, „Čuvari Đetinje“
Join the Guardians of Đetinja
No degree needed — you get a device, a short training and a monitoring site. Fifteen minutes a week is enough for your point on the map to build its own data series.