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It uses meteorological data from the moment of the recording of the satellite data to solve the 'instantaneous' energy balance, and uses extrapolation to calculate daily evapotranspiration. Using a time series of satellite and meteorological data, periodic cumulative (e.g. weekly, monthly, yearly) evapotranspiration data can be calculated.
Potential evapotranspiration is expressed in terms of a depth of water or soil moisture percentage. If the actual evapotranspiration is considered the net result of atmospheric demand for moisture from a surface and the ability of the surface to supply moisture, then PET is a measure of the demand side (also called evaporative demand).
Monthly estimated potential evapotranspiration and measured pan evaporation for two locations in Hawaii, Hilo and Pahala. Potential evapotranspiration is usually measured indirectly, from other climatic factors, but also depends on the surface type, such as free water (for lakes and oceans), the soil type for bare soil, and also the density and diversity of vegetation.
The California Water Plan (Water Plan) is the State of California’s long-term strategic plan for managing and developing water resources throughout the state. The Water Plan is mandated by California Water Code Sections 10004–10013, [ 1 ] and the California Department of Water Resources (DWR) is required to update the plan every five years ...
Inputs to SPEI datasets can include high-resolution potential evapotranspiration (PET) from the Global Land Evaporation Amsterdam Model (GLEAM) and hourly Potential Evapotranspiration (hPET). GLEAM is a set of algorithms designed to calculate actual evaporation, PET, evaporative stress, and root-zone soil moisture.
Remote sensing is an approach to modeling evapotranspiration using an energy balance and the latent heat flux to find evapotranspiration rates. Evapotranspiration (ET) is a part of the water cycle, and accurate ET readings are important to local and global models to manage water resources. ET rates are an important part of research in hydrology ...
Fire insurance has become more costly—if it's available at all—in California, leading more Golden State homeowners to turn to the FAIR Plan, a government-backed insurer of last resort.
In 1933, the California State Legislature and Governor James Rolph approved the construction of the Central Valley Project, with initial plans to build a 420-foot dam at Kennett. This would provide regular flows out to the San Francisco Estuary, reducing salinity intrusion into the Sacramento-San Joaquin Delta .