22. Potential Evapotranspiration over India
Evapotranspiration plays a vital role in India's hydrologic cycle, affecting water resources, agriculture, and climate assessments. Understanding Potential Evapotranspiration (PET) is essential for effective irrigation planning and management, particularly in a country with diverse climatic regions. Methods of estimating PET, the factors influencing it, and the challenges faced in accurate measurement are pivotal for sustainable water resource management.
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What we have learnt
- Evapotranspiration is the sum of evaporation and transpiration from the Earth's surface.
- Potential Evapotranspiration (PET) is crucial for understanding water needs in agriculture and managing water resources.
- Various empirical and physically-based methods exist for estimating PET, each with its strengths and limitations.
Key Concepts
- -- Evapotranspiration (ET)
- The combined loss of water from the surface through evaporation and transpiration from plants.
- -- Potential Evapotranspiration (PET)
- The amount of water that would evaporate under optimal conditions with a sufficient water supply.
- -- PenmanMonteith Method
- A comprehensive method for estimating PET that accounts for multiple climatic factors.
- -- MODIS
- A satellite data source used for large area estimation of PET.
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