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English (US)
Choose your OTT HydroMet brand and region:
Read more about the various measurement principles that OTT HydroMet employs.
Guide to Hydrological Practices - Volume I
Click here to download the WMO Guide
Guide to Hydrological Practices - Volume II
Management of Water Resources and Application of Hydrological Practices
Click here to download the WMO Guide
How Streamflow is Measured – USGS
Stream gaging generally involves 3 steps:
Measuring stream stage—obtaining a continuous record of stage—the height of the water surface at a location along a stream or river
The discharge measurement—obtaining periodic measurements of discharge (the quantity of water passing a location along a stream)
The stage-discharge relation—defining the natural but often changing relation between the stage and discharge; using the stage-discharge relation to convert the continuously measured stage into estimates of streamflow or discharge
Click here to get to the USGS Streamgaging overview
Meteorological measurements for weather forecasting and climatology have been carried out on a regular basis for centuries. However, the data acquired can only be evaluated and interpreted after having statistically recorded medium-term and long-term atmospheric conditions.
Nowadays, transport and communications such as ground, air and sea traffic could not be maintained without these data, which are mainly being collected from measurements and observations in the atmosphere close to the ground (the Boundary Layer).
The main meteorological parameters in this field are:
Wind speed and direction
Air temperature
Air pressure
Air humidity
Precipitation
Haze and contents of the air
Solar and terrestrial radiation
These parameters are also significant for such issues as air pollution, avalanche warning, sun simulation, renewable energy industry, agriculture, forestry, water supply and distribution, town and regional planning.
For example, the evaluation and interpretation of gas emission measurements is only possible in comparison with meteorological data acquired concurrently.
Solar Radiation Measurement - WMO
Click here to download the WMO Guide
The Sun’s impact on the Earth
How WMO measures sunlight
WMO has launched a video on the critical role that the WMO World Radiation Center plays in “Measuring sunlight”.
While the Earth’s climate is influenced by many factors – among them greenhouse gases, ocean temperatures and volcanic eruptions – the sun plays a particularly central role.
Scientists therefore rely on solar radiation measurements in order to study climate variability and change and to forecast the weather.
The video was released as WMO hosts high-level meetings on future priorities for weather, climate and environmental science and research.
There is a special focus on translating scientific advances into user-friendly services for society.
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