Rivers A Drainage Basin A drainage basin is
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Drainage Basin A drainage basin is the land area from which a river or stream gets its water supply. Watersheds or divides are the highland areas which separate one basin from another.
Dendritic River Pattern A dendritic river pattern is like the veins or a leaf. This pattern is found in level areas with a uniform bedrock or surface.
Trellis River Pattern A trellis river pattern is found where there are differences in the bedrock or in mountain-building regions. There may be inclined layers of varying resistances that help form this pattern.
A Parallel River Pattern A parallel-pinnate pattern develops where there are long parallel ridges in mountains or hills.
Radial River Pattern A radial river pattern develops around a volcano or circular mountain or domed hill.
Rectangular River Pattern A rectangular river pattern develops over bedrock which has strong fractures or joints in a rectangular pattern.
Deranged River Pattern A deranged river pattern develops where continental glaciers have scoured the land’s surface, rearranging the flows of streams and rivers.
Perennial Rivers which flow year round are called perennial rivers.
Seasonal Rivers flowing only during a wet season are called seasonal rivers.
Intermittent or Ephemeral Rivers that rarely flow, every now and then, are called intermittent or ephemeral rivers. Rivers in deserts are commonly ephemeral or intermittent.
A Stream’s Velocity A river or stream’s velocity is affected by discharge, profile, channel roughness and hydraulic radius.
Stream Discharge and Velocity A stream’s discharge refers to the volume of water per time that it carries. A stream’s velocity is directly related to its discharge.
Stream Profile and Velocity The profile or shape of a stream bed affects its velocity with deeper profiles generally favouring higher velocities.
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