Click a marker to see the station's details. Use the toggle above to switch between QCVN08:2023 water-quality classes and the degradation classification. In the water-quality view, press ▶ to animate the basin month by month — each marker shows the most-recent class observed up to that point.
Number of QCVN08:2023 water-quality samples classified as A (Good), B (Moderate), C (Poor), D (Very poor) per year (stacked bar).
Each row is one monitoring station, ordered from upstream (top) to downstream (bottom) as listed in the Analysis Sum sheet (upstream to downstream). Bars show the cumulative share of A / B / C / D classified samples; press ▶ or drag the time slider on the map to watch the distribution evolve.
Click a row to focus the map on that station.
| Station | Province | Records | %A | %B | %C | %D | Recent class | Status |
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Discharge stations with daily flow time series. Q85% is the conservative threshold for irrigation, hydropower and domestic use (QCVN 04-05:2022/BNNPTNT). Qmin is the multi-year average of the three driest months.
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Min1 | Min2 | Min3 | avg Min |
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