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Terracing - The agricultural practice of using a raised strip of earth, more or less level or horizontal, usually constructed on or near a contour and designed to make the land suitable for tillage and to prevent accelerated erosion.

Tillage - The act of preparing the soil by mechanical manipulations for crop production.

Total streamflow - Computed flow that includes effects of consumption, water transfers, and evaporation from manmade reservoirs, but not ground water overdraft.

Transpiration - The process by which water vapor passes through a living plant and enters the atmosphere.

Trophic level - One of the hierarchical strata of a food web characterized by organisms that are the same number of steps removed from the primary producers.