… main-stem GPS gauges · Czechia + Germany
Feeds liveLabe + Elbe · source to sea
One continuous system across Czechia and Germany on a single distance-from-the-sea axis. Side rivers drop in from above with the flow they deliver, each arrow landing on the water where it joins; reservoirs and their latest operator readings sit on the way down.
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Reference gauge: NEU DARCHAU170 m³/s · the furthest-downstream main-stem gauge currently reporting flow, so it captures the largest accumulated upstream reach.
Czech kilometres are measured from the sea and German ones from the state border, so both are converted to one distance-from-the-sea axis; the border pair Hřensko and Schöna agree to within a metre of elevation, which is the check that the conversion holds. River power is gravitational power carried by the flow (ρ·g·Q·Δh), not metered generation - it is a floor rather than a total, because a reach whose downstream gauge reports no discharge contributes nothing. The navigability line is an indicative planning threshold, not an official fairway forecast. Side-river positions are approximated to the nearest main-stem gauge. A reservoir is drawn at its operator's own chainage where it stands on this river, and at the confluence where it stands on a side river of it - never at a kilometre borrowed from another river's scale.