Question

Q. In this drainage pattern, the primary tributaries of rivers flow parallel to each other, and secondary tributaries join them at right angles. It develops where sedimentary rocks have been folded or tilted and then eroded to varying degrees depending on their strength. Rivers in the Old fold mountains of the Singhbhum region(Chotanagpur Plateau) serve as its examples. The drainage pattern in the above paragraph refers to:

• A. Dendritic pattern
• B. Trellis Pattern
• C. Centripetal Pattern
• D. Pinnate Pattern

Answer 1

The correct option is B Trellis Pattern

Explanation:

Drainage pattern refers to a design in which a river and its tributaries form together from its source to its mouth.

Main types of drainage patterns:

Dendritic pattern:

• Drainage patterns appearing like an irregular tree branch is a dendritic pattern.
• It develops in a terrain that has uniform lithology, and where faulting and jointing are insignificant.
• River Godavari, Mahanadi, and Kaveri are its examples.

Trellis Pattern:

• In the Trellis pattern, the primary tributaries of rivers flow parallel to each other, and secondary tributaries join them at right angles. It develops where sedimentary rocks have been folded or tilted and then eroded to varying degrees depending on their strength.
• Rivers in the Old fold mountains of the Singhbhum region(Chotanagpur Plateau) serve as its examples.

Radial Pattern:

• In a radial pattern, the streams radiate outwards from a central high point.
• Rivers like Narmada, Son, and Mahanadi originating from Amarkantak Hills flow in different directions and are good examples of radial patterns.

Centripetal Pattern:

• Similar to the radial drainage system, with the only exception that radial drainage flows out versus centripetal drainage flows in from all directions in a lake or depression.
• Streams of Ladakh, Tibet, and the Bagmati and its tributaries in Nepal are its examples.

Rectangular Pattern:

• The mainstream bends at right angles and the tributaries join at right angles creating rectangular patterns.
• Streams found in the Vindhya Mountains of India are its examples.

Pinnate Pattern:

• This pattern resembles the veins of a leaf.
• The drainage network of the upper Son and Narmada rivers denotes the example of a pinnate drainage pattern.