River Outfall Monitoring: Required Equipment

River outfalls are the last checkpoint of discharge supervision — regulators require them to be visible, measurable and traceable. A standard outfall monitoring site is built from four layers:

• Level layer: a visual fusion radar water level gauge mounted above the outfall well or open channel records the discharge hydrograph at ±1mm accuracy while its camera keeps site imagery — illegal or excessive discharge has nowhere to hide behind dual evidence of data plus photos;
• Water-quality layer: water-quality sensors (COD, ammonia nitrogen, pH, etc.) hang off the gauge's spare RS485 port, so one bus carries quality data without a separate acquisition box;
• Flow layer: for full-pipe pressured outfalls add an LGF-PA66 aviation-grade electromagnetic flow meter for total discharged volume; for open-channel sections a Doppler radar flow meter measures level, velocity and flow contactlessly;
• Telemetry layer: an EC32 or EC60 RTU aggregates all sensors and backhauls to the supervision platform over 4G/NB-IoT, with IP68 protection for riverside humidity and solar-plus-battery power where mains supply does not exist.

Deployment notes: survey the outfall type (open channel / pipe / culvert) before fixing the sensor mix; keep the mounting position clear of direct echo interference; and align level, quality and imagery on one timeline in the platform, otherwise compliance reports lose credibility.

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