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  2. Drain-induced barrier lowering - Wikipedia

    en.wikipedia.org/wiki/Drain-induced_barrier_lowering

    As channel length decreases, the barrier φ B to be surmounted by an electron from the source on its way to the drain reduces. Drain-induced barrier lowering (DIBL) is a short-channel effect in MOSFETs referring originally to a reduction of threshold voltage of the transistor at higher drain voltages.

  3. Trench drain - Wikipedia

    en.wikipedia.org/wiki/Trench_drain

    A trench drain (also known as a channel drain, line drain, slot drain, linear drain, or strip drain) is a specific type of floor drain featuring a trough- or channel-shaped body. It is designed for the rapid evacuation of surface water or for the containment of utility lines or chemical spills.

  4. Rill - Wikipedia

    en.wikipedia.org/wiki/Rill

    A downslope view of part of the eroding rill network from County Tyrone, Northern Ireland.See below for a close-up view of a single rill. In hillslope geomorphology, a rill is a shallow channel (no more than a few inches/centimeters deep) cut into soil by the erosive action of flowing surface water.

  5. Percolation trench - Wikipedia

    en.wikipedia.org/wiki/Percolation_trench

    It is a shallow excavated trench filled with gravel or crushed stone that is designed to infiltrate stormwater though permeable soils into the groundwater aquifer. [ 1 ] [ 2 ] A percolation trench is similar to a dry well , which is typically an excavated hole filled with gravel. [ 3 ]

  6. Watershed delineation - Wikipedia

    en.wikipedia.org/wiki/Watershed_delineation

    Watershed delineation is the process of identifying the boundary of a watershed, also referred to as a catchment, drainage basin, or river basin.It is an important step in many areas of environmental science, engineering, and management, for example to study flooding, aquatic habitat, or water pollution.

  7. Low-water crossing - Wikipedia

    en.wikipedia.org/wiki/Low-water_crossing

    This type of crossing is much cheaper to build than a high bridge that keeps the road surface consistently above the highest water level, and is usually deployed in semi-arid areas where high-volume rainfall is rare and the existing channel is shallow (which requires extra ramping on the banks to build a more elevated bridge and thus costs more ...

  8. Flow control structure - Wikipedia

    en.wikipedia.org/wiki/Flow_control_structure

    Weir on Lake Tecumseh, Virginia. A flow control structure is a device that alters the flow of water in a stream, drainage channel or pipe. As a group these are passive structures since they operate without intervention under different amounts of water flow and their impact changes based on the quantity of water available.

  9. Drainage density - Wikipedia

    en.wikipedia.org/wiki/Drainage_density

    According to Strahler’s stream ordering system, all source areas drain into a primary channel, by the definition of a primary channel. [4] Bras et al. (1991) [5] describe the conditions that are necessary for channel formation. Channel formation is a concept intimately tied to the formation and evolution of a drainage system and influence the ...

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