Managing critical water assets
Cost-efficient water-cycle services
Awareness & understanding
Increase food production
Welfare & healthy growth
Ensuring safe water
Access to timely water data
Reliable observation and forecasting
Sustainable water infrastructures
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Support, prevent and improve
Innovative, fast and low risk
Cost effective and scalable
Automated flow measurement system in watercourses.
Stream gauging is the process of measuring the water flow at a particular point on a stream, river or canal. An online stream gauging station is an essential real-time tool for watercourse knowledge of said streams, rivers and canals.
The calculation of flow, based on the measurement of indirect or direct parameters, allows authorities to monitor watercourses across a country or region. A stream gauging station’s data series can also be used historically, for hydrological and hydraulic studies and modelling.
Indirect measuring technique
Invasive or non-invasive techniques can take water level measurements.
The most common invasive technique used is a measurement by float and counterweight in a tranquiliser well with a piezoresistive sensor.
Popular non-invasive techniques include ultrasonic or microwave RADAR technology or limnimetric scale digitalisation by image processing.
Flow rate is calculated by measuring the water level and the flow rate curve (q-h), based on the hydrological modelling of the natural or artificial section, or empirically if it is a prefabricated section.
Calibrating the flow rate curve through direct measurements maintains the reliability of indirect flow measurements.
Direct measuring technique
In natural sections of rivers and canals, indirect measurements can cause a high uncertainty in results. The measurement of the flow velocity-directly related to the resulting flow through the geometric model of the riverbed-is used instead.
Direct measuring techniques are also invasive or non-invasive.
Ultrasonic measurement is an invasive technique. For natural streams or open channels, Doppler profilers measure water current velocities or transit time measurements can be taken to establish flows.
Non-invasive direct flow measurements involve the measurement of surface speed. Flow can be gauged using radar or computer vision, or a combination of both techniques.
Guadiana River IWRMS
Guadiana River Basin Authority
Enhancing flood and drought risk awareness and response.
Flood Early Warning System
Duero River Basin Authority
Enhancing flood risk awareness and response.
Catalan River Basin District IWRMS
Catalan Water Agency (ACA)
Maintenance and technical support services.