Glossary/water dictionary

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unconfined aquifers

An aquifer in which the groundwater table is free to rise and fall according to hydraulic gradients.^

underground drainage

Drainage, either natural or artificial, beneath the surface of the Earth.^

unsaturated zone

The zone immediately below the land surface where the pores contain both water and air, but are not totally saturated with water. These zones differ from an aquifer, where the pores are saturated with water.^

user fees

All financial contributions to be borne by the users (or possibly their farmer in the case of renting). The fees pay for the supply of water and accompanying services.^