Evapotransporation (ET) beds rely on the combined natural properties evaporation of water from the soil and transpiration by plants growing on top of the bed. An ET bed is a bed of sand with trenches in the bottom for storing the water until it is

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Evapotransporation (ET) beds rely on the combined
natural properties evaporation of water from the
soil and transpiration by plants growing on top
of the bed. An ET bed is a bed of sand with
trenches in the bottom for storing the water
until it is evaporated or transpired by the
plants. These systems are designed based on
rainfall rates and expected evapotransporation
rates. These beds can be either lined or unlined,
depending on the permeability of the surrounding
soil. Gravely sands and karst soils require a
liner which is made of natural clays, synthetic
lining, or concrete. Unlined beds are used for
impermeable soils like clay. Plant cover is
essential to the proper function of these
systems. Grasses and other plants must be well
maintained for them to work properly.