Micrometeorological Instrumentation & Measurements

The key meteorological parameters necessary for hydrologic study are:

Precipitation - includes any moisture falling from the atmosphere in liquid or frozen form. Collected by rain gages, both non-recording, which retains the total precipitation between observations and recording which gives time of precipitation so intensities can be computed and transmitting rain gage sites for sending data to a central station for analysis.

Air Temperature- is commonly measured because of its importance to evaporation, transpiration, soil conditions and snowmelt.

Humidity - of the air near the surface has a definite influence on the rate of evaporation from lakes and on evapotranspiration from land areas.

Wind - Hydrologically, wind influences the magnitude of evapotranspiration and windspeed and direction influence rain gage catch and snowfall drift. Anemometers are designed to measure windspeed and direction.

Solar Radiation - It provides the energy that drives regional and global hydrologic cycles. Radiation is the most important factor in the evaporation and transpiration processes. Pyranometers and Net Radiometers are used to measure solar radiation.

Barometric Pressure - This is required for the potential evapotranspiration and dew points. Water level in a confined aquifer will be affected by barometric pressure.

Technical Data

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