Chapter
Apr 25, 2016
Chapter 13
Selection of Appropriate Estimating Method
Publication: Evaporation, Evapotranspiration, and Irrigation Water Requirements
Abstract
All methods of calculating evaporation and evapotranspiration (ET) that are based on climatological data produce only estimates of ET. The estimates’ accuracy depends substantially on the quality of data and on the completeness and physical basis of the method. Considerations in both method selection and resource allocation include the time required to collect and screen climate data for quality and to process the climate data. The time required to obtain associated relevant data such as soil type, crops being grown, or landscape vegetation, should also be considered. The major weather variables to review are solar radiation, temperature, humidity, and wind speed. In general, the crop coefficient–reference crop coefficient method has proven to be accurate, robust, consistent, and straightforward to apply. The direct ET methods have the potential for more precise measurements, but generally require more detailed parameterization and crop-specific information.
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© 2016 American Society of Civil Engineers.
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Published online: Apr 25, 2016
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ASCE Technical Topics:
- Agriculture
- Climates
- Construction engineering
- Construction management
- Crops
- Data collection
- Engineering fundamentals
- Environmental engineering
- Evaporation
- Evapotranspiration
- Hydrologic data
- Hydrologic engineering
- Hydrology
- Irrigation engineering
- Meteorology
- Methodology (by type)
- Project management
- Research methods (by type)
- Resource allocation
- Water and water resources
- Weather forecasting
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Task Committee on Revision of Manual 70
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