# Define the following drainage patterns: Dendritic, Trellis, Rectangular and Radial

Q- Define the following drainage patterns: Dendritics, Trellis, Rectangular and Radial.

Answer- Dendritics: The Dendritic pattern is developed when the river channels follow the slope of the terrain. The stream with its tributaries resembles the branches of a tree because they are thin in a big numbering.

Trellis: Trellis is formed when a river is joined by its tributaries at approximately right angles. A Trellis drainage pattern develops where hard and soft rocks exist parallel to each other.

Rectangular: A Rectangular pattern is formed when water flows or water stream flows on strongly joint rocky terrains.

Radial: A Radial drainage pattern develops or forms when a stream flows in different directions from a center which is usually a dome-shaped pattern.

In the above question, it was asked to define the following drainage patterns dendritic trellis rectangular and radial. So, we provided you little information about each of them. We hope that you noted this answer properly. If you are reading this question so this means that you are a student in class 9th. Below we are providing you with some very important questions for your class 9th exams:

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What advantages did Indian constitution makers have unlike South Africa

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Now we are going to provide you some detailed information about Dendritic, Radial, Trellis, and Rectangular drainage patterns.

What are Drainage systems?

According to geomorphology, Drainage Systems are those river systems that are formed due to a lake, river, or basin in a drainage basin. The drainage systems are mainly dependent on the patterns of the drainage systems. So, now I am going to tell you about different types of drainage patterns one by one. We would like to tell you to read this article very carefully to understand each and everything properly.

There are mainly Nine types of drainage patterns. These are as follows:

1. Parallel Drainage pattern: A parallel drainage system occurs when several small water streams that are falling down from a slope get combined to form a big water stream. These types of water streams lead to soil erosion as they are falling down the slope and many small water streams combine together to increase water flow. This kind of drainage pattern can only be seen in a long and uniform slope of a hill or any mountain.

2. Dendritic drainage pattern: This pattern is named after its looks like the word ‘dendritic’ means ‘like a tree’ and this drainage pattern is the same as In Dendritic drainage pattern, very small sub-tributaries combines to form a tributary and many tributaries got merged int a big water stream. In this way, they form the branch of a tree-like structure. That is why this drainage pattern forms v-shaped valleys.

3. Rectangular drainage pattern: Rectangular drainage patterns are formed due to rocks that are approximately uniformly resistant to any kind of erosion. These rocks should have two directions of joining at an approx nighty degree angle. This pattern is named on the basis of its shape that is usually rectangular and sometimes squared shape. These joints in rectangular drainage patterns are less resistant to erosion as compared to rocks. This pattern is found in Arun River of Nepal.

4. Radial Drainage Pattern: The Radial drainage pattern forms when several small water streams such as tributaries fall from a dome-like pattern of land. In t the small streams fall into different directions. In India, the radial drainage pattern can be seen in Ramgarh Crater as well as Amarkantak Range. Dogu’s Tembien in Ethiopia is also an example of a Radial Drainage pattern.

5. Trellis Drainage Pattern: In a strike valley the small tributaries fall into the steep slopes of mountainsides. These small water streams fall on the main water stream in a perpendicular manner. The small water streams and the main river form a trellis-like structure that’s why this drainage system is called as Trellis Drainage Pattern. The Trellis Drainage Pattern can be seen in Appalachian Mountains of North America.

6. Centripel drainage pattern: When several water streams fall and get merged into one basin. So, this pattern is called as Centripel pattern. The other name of the Centripel drainage pattern is the inland drainage pattern. We think that this information is enough to describe to you about centripel drainage pattern. In case you want to read more about centripel drainage patterns. So, you can search on the browser for it.

7. Annular Drainage Pattern: In this pattern, the water streams are used to form a concentric path along a belt of some weak rocks. So, it forms a ring-like structure in its middle with rock. This kind of drainage pattern can be mostly seen in a maturely dissected structural dome or any basin. The Red Valley is the best example to see an annular drainage pattern. In the Red valley, the dome-like structure is of The Black Hills in South Dakota.

8. Angular Drainage Pattern: Angular Drainage Patterns form when bedrock joints and faults get interacted on any angle except ninety degrees. These angles are either more than or less than ninety degrees.

9. Deranged Drainage Pattern: In this pattern of river drainage, there is no coherent pattern of water streams. This type of drainage pattern is mostly found in areas with much geological disruption. One of the best examples of a Deranged Drainage Pattern is the Canadian Shield.

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