DRAINAGE SYSTEM

Introduction

Drainage system refers to the network of rivers and streams that drain an area of its surface water. It is a crucial aspect of physical geography as it influences the landscape, soil formation, vegetation, and human activities. The drainage system is shaped by various factors such as the nature of the terrain, climate, geological structure, and the amount of rainfall. Rivers play a significant role in shaping the earth's surface through erosion, transportation, and deposition of sediments. The study of drainage systems helps in understanding the distribution of water resources, flood control, irrigation potential, and planning of settlements. Drainage patterns also provide insights into the geological history and structure of the region. The chapter explores the classification of drainage systems, their characteristics, and the major river systems of India.

• Drainage system is the network of rivers and streams draining an area.
• It influences landscape, soil, vegetation, and human activities.
• Factors affecting drainage include terrain, climate, geology, and rainfall.
• Rivers shape the earth’s surface by erosion, transportation, and deposition.
• Studying drainage helps in water resource management and flood control.
• Drainage patterns reveal geological history and structure.
• 📌 Drainage system: Network of rivers and streams draining an area.
• 📌 Drainage basin: The area drained by a river and its tributaries.
• 📌 Erosion: The process of wearing away earth’s surface by water or wind.

Drainage Systems of India

India’s drainage system is broadly divided into two categories based on the direction of flow and the geological structure: the Himalayan rivers and the Peninsular rivers. The Himalayan rivers are young, perennial, and have large drainage basins. They originate from the glaciers and snowfields of the Himalayas and flow through the northern plains. These rivers include the Indus, Ganga, and Brahmaputra systems. They carry large volumes of water and sediment, and are prone to flooding. The Peninsular rivers are older, mostly seasonal, and have smaller drainage basins. They originate from the Peninsular plateau and flow either eastward into the Bay of Bengal or westward into the Arabian Sea. Examples include the Godavari, Krishna, and Mahanadi rivers. The Peninsular rivers have a more stable course and are important for irrigation and hydroelectric power. The drainage systems reflect the geological history and climatic conditions of the region.

• India’s rivers are divided into Himalayan and Peninsular systems.
• Himalayan rivers are young, perennial, and glacier-fed.
• Peninsular rivers are older, mostly seasonal, and originate from plateau.
• Himalayan rivers have large drainage basins and carry heavy sediment loads.
• Peninsular rivers flow east or west and are important for irrigation.
• Drainage systems reflect geology and climate of India.
• 📌 Himalayan rivers: Rivers originating from the Himalayas, perennial and glacier-fed.
• 📌 Peninsular rivers: Rivers originating from the Peninsular plateau, mostly seasonal.
• 📌 Drainage basin: The land area drained by a river and its tributaries.