A drainage basin, also known as a watershed or reservoir, funnels rainfall and excess water into a nearby river or stream. The pattern of the basin is determined by geographic boundaries, landscape, climate, soil type, and plant life. Different patterns include radial, parallel, rectangular, trellis, annular, and dendritic. Imbalanced patterns occur in areas where the ground has recently formed or been revealed.
A drainage basin is a natural extension of land that acts as a funnel to funnel rainfall and excess water into a nearby river or stream. They are also known as watersheds, drainage basins, watersheds, or reservoirs. Drainage basins are separated by geographic boundaries such as mounds, hills, ridges, or mountains, known as watersheds or watersheds. The divisions help determine the direction of water flow, while landscape, climate, soil type, and plant life will affect the content and movement of the flow.
When a watershed first forms, it can adopt one of many different patterns that are easily recognizable on a map or from an aerial view. During rainfall drainage, also known as runoff, basins flow in a hierarchical pattern. Smaller sub-drainage basins combine to form larger basins. Generally, smaller basins contribute to streams, while larger basins contribute to rivers. The patterns formed by these drainage basins often offer insight into the landscape over which they flow.
Radial drainage basin patterns occur around a central, high point such as a hill or mound. The streams flow down from the highest point. Similar to the radial pattern is the parallel pattern that forms in rocky areas where water flows uniformly in one direction. When there are fractures in the massive rock over which water flows, such as fault lines or joints, the drainage patterns take right angles and form a rectangular pattern.
If the catchment area is in an area where the rock is uprooted or has an upward slope, the stream will assume a trellis pattern and flow along weaker areas of the rock formation. The opposite of the trellis model is the annular model in which stream channels possess a common center, such as a trough or crater, and flow along weaker rock beds. Dendritic patterns, which resemble the meandering veins of a leaf, occur in areas where erodible sediments are present, such as found in shallow streams or rivers.
Imbalanced patterns of drainage basins form when the ground over which water flows has only recently been formed or revealed. Pockets of water form along the bends of the streams which have not had the opportunity to fully mature. This type of pattern is usually found in areas where there has been a recent natural event such as some type of volcanic activity. In these cases, over time, the flow will mature and its flow will progress.
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