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

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

Answer- Dendritic: The Dendritic pattern develops when the main water stream or river channels follow down the slope of the terrain. The stream with its tributaries resembles the branches of a tree because they are thin and are 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. This is very rarely seen in drainage patterns of water streams. The Trellis Drainage Pattern can be seen in the Appalachian Mountains of North America.

Rectangular: A Rectangular pattern is formed when water flows or water stream flows on strongly joint rocky terrains. These rocks that are placed there should have two directions of joining at an approx nighty degree angle. This pattern is named according to its shape is usually rectangular and sometimes squared shape. These joints in rectangular drainage patterns are less resistant to soil erosion as compared to rocks. The rectangular drainage pattern can be seen in the Arun River of Nepal.

Radial: A Radial drainage pattern forms when a water stream flows in different directions from a center which is usually a dome-shaped pattern. The radial drainage pattern can be seen in Ramgarh Crater as well as Amarkantak Range in India and Dogu’s Tembien in Ethiopia.

Very Important Questions for you

In the question given above, it was asked to define the following drainage patterns dendritic trellis rectangular and radial. So, we provided you with all the necessary information about each of them. We hope that you have already noted down this answer properly. If you are reading this question we are damn sure that you are a student in class 9th. Below we are providing you with some very important questions that may help you in exams:

Now we would like to tell you more about Drainage Patterns of water streams and their types. We will further describe each and every type in detail. So, if you want to read this article more so you can otherwise you should read the above answer only. The data given below is only for your extra knowledge:

## What are Drainage Patterns?

According to geomorphology, Drainage Patterns are those patterns that were formed by any water stream especially a lake, river, or basin in a drainage basin. The drainage patterns are totally dependent on the water stream and surface on which its flows. So, there are several drainage patterns that were formed due to water streams. These drainage patterns are of nine main types. These are given below:

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.

• Angular Drainage Pattern
• Centripel drainage pattern
• Annular Drainage Pattern
• Trellis Drainage Pattern
• Dendritic drainage pattern
• Parallel Drainage pattern
• Rectangular drainage pattern

## Types of Drainage Patterns

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

1. 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.

2. 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 it, 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.

3. 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.

4. 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.

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 the Appalachian Mountains of North America.

6. 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.

7. 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.

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. Rectangular drainage pattern: Rectangular drainage patterns are formed due to rocks that are approximately uniformly resistant to any kind of erosion. These rocks that are placed there should have two directions of joining at an approx nighty degree angle. This pattern is named according to its shape which is usually rectangular and sometimes squared shape. These joints in rectangular drainage patterns are less resistant to soil erosion as compared to rocks. The rectangular drainage pattern can be seen in the Arun River of Nepal.