DEFINITION OF DENDRITIC DRAINAGE

Characterized by random branching of

streams in almost all directions, with smaller tributaries feeding

into larger channels. The pattern resembles a branching

tree. Streams are arranged in an orderly fashion in drainage

basins, known as the stream order. Smallest segments lack

tributaries and are known as first order streams, second order

streams form where two first order streams converge, third

order streams form where two second order streams converge,

and so on. Several categories of streams reflect different

geologic histories. A consequent stream is one whose

course is determined by the direction of the slope of the land.

A subsequent stream is one whose course has become adjusted

so that it occupies a belt of weak rock or another geologic

structure. An antecedent stream is one that has maintained its

course across topography that is being uplifted by tectonic

forces, crossing high ridges. Superposed streams are those

whose course was laid down in overlying strata, onto unlike

strata below. Dendritic drainage patterns form on horizontal

or beveled sediments, or uniformly resistant crystalline

igneous and metamorphic rocks. The drainage patterns form

when the terrain attains a gentle slope.

See also DRAINAGE BASIN.

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