annular drainage system
a drainage system arranged in a circular fashion around a central basin. See also dendritic, deranged, parallel and rectangular drainage systems

Dictionary of ichthyology. 2009.

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  • Drainage system (geomorphology) — In geomorphology, a drainage system is the pattern formed by the streams, rivers, and lakes in a particular drainage basin. They are governed by the topography of the land, whether a particular region is dominated by hard or soft rocks, and the… …   Wikipedia

  • drainage system — several types of drainage system for rivers are recognised, namely annular, dendritic, deranged, parallel, rectangular and trellis (all q.v.) …   Dictionary of ichthyology

  • dendritic drainage system — the commonest type of drainage system comprising a main river with tributaries that themselves have tributaries. Such a system usually occurs on a gentle slope. See also annular, deranged, parallel, rectangular and trellis drainage systems …   Dictionary of ichthyology

  • deranged drainage system — a system without any obvious or coherent pattern as a result of much geological disturbance, as in areas cleared of soil cover by ice ages. The drainage patterns are still being determined and the glaciers left much water that accumulates in low… …   Dictionary of ichthyology

  • rectangular drainage system — a system of streams arranged around faults in the ground. See also annular, dendritic, deranged, parallel and trellis drainage systems …   Dictionary of ichthyology

  • trellis drainage system — a system found where streams run parallel to structures in the bedrock with minor tributaries coming in at right angles. See also annular, dendritic, deranged, parallel and rectangular drainage systems …   Dictionary of ichthyology

  • parallel drainage system — a pattern of rivers caused by steep slopes with some relief, often found in mountainous areas. The rivers are fast and straight with few tributaries. See also annular, dendritic, deranged, rectangular and trellis drainage systems …   Dictionary of ichthyology

  • river — river1 riverless, adj. riverlike, adj. /riv euhr/, n. 1. a natural stream of water of fairly large size flowing in a definite course or channel or series of diverging and converging channels. 2. a similar stream of something other than water: a… …   Universalium

  • environmental works — ▪ civil engineering Introduction       infrastructure that provides cities and towns with water supply, waste disposal, and pollution control services. They include extensive networks of reservoirs, pipelines, treatment systems, pumping stations …   Universalium

  • tunnels and underground excavations — ▪ engineering Introduction        Great tunnels of the world Great tunnels of the worldhorizontal underground passageway produced by excavation or occasionally by nature s action in dissolving a soluble rock, such as limestone. A vertical opening …   Universalium

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