Social Sciences: Class 5 — Chapter 2: Journey of a River

• Origin: The journey of the Godavari begins high up in the Western Ghats at Trimbakeshwar in Maharashtra.
• Growth: It starts as a small stream and grows wider and stronger as rainwater and other streams join it.
• Tributaries: The smaller streams that join the main river are called tributaries. Key tributaries of the Godavari include the Manjira, Indravati, and Sabari.
• Length and Destination: It travels a distance of $1,465\text{ km}$ across India before emptying into the Bay of Bengal.
• Rank: It is the second longest river in India, second only to the river Ganga.

The Godavari flows through several Indian states and supports various ecological and human-made landmarks:

• States: Maharashtra, Telangana, Andhra Pradesh, Chhattisgarh, and Odisha.
• Dams: Sriram Sagar Project (SRSP) in Telangana and Polavaram Dam in Andhra Pradesh.
• Wildlife Sanctuaries & Parks: Kawal Tiger Reserve, Pench National Park, and Coringa Wildlife Sanctuary.

• The Godavari is featured in ancient Indian texts like the Ramayana and the Puranas.
• It is widely referred to as Dakshina Ganga (Ganga of the South) due to its sacred status in southern India.
• Pilgrims gather at holy sites along its banks, such as Nashik, to take a holy dip, particularly during the massive festival of Godavari Pushkaram.

• Perennial Rivers: Rivers that flow all year round because they have a constant source of water (like the Godavari).
• Seasonal Rivers: Rivers that flow only during specific times, typically when they receive water during the rainy season.

• Forest Wildlife: The river passes through rich forests home to wildlife such as the tiger, barking deer, the Indian golden gecko, and red sandalwood trees.
• Delta: Near the end of its journey, the river slows down and splits into many small streams, forming a delta where freshwater meets the salty sea.
• Coringa Mangrove Forests: This unique ecosystem marks the end of the Godavari's journey at the sea.

Since ancient times, human civilizations have settled near rivers because they provide essential resources:

• Water for domestic needs (drinking, cooking, washing).
• Water for agriculture (irrigation of crops like paddy) and industrial manufacturing in factories.
• Livelihoods through fishing, transport, and tourism.

Ecotourism refers to visiting natural places like forests, rivers, or mountains to enjoy their beauty, observe wildlife, and learn about nature without causing harm to the environment.

A dam is a giant wall built across a river to block its flow and store water in a large artificial lake called a reservoir.

• Benefits: Stores water for dry seasons, provides drinking water, irrigates crops, and generates electricity.
• Consequences: Floods vast areas of land upstream, destroys forests, displaces wildlife, and forces local communities to leave their homes and relocate.

• Pollution Sources: Industrial waste, plastic litter, sewage, and chemical runoff pollute river waters, harming aquatic life and making water unsafe for human consumption.
• The Green Blanket (Eutrophication): When chemical fertilizers from agricultural fields wash into the river, they act as nutrients that cause aquatic plants and algae to grow rapidly. This forms a thick green layer on the water's surface, blocking sunlight and choking aquatic life by reducing oxygen levels, making it difficult for fish to breathe.

During periods of excessive rainfall, rivers can overflow their banks, causing severe floods that submerge houses, roads, and agricultural fields.

• Role of Trees: Forests and trees play a critical role in flood prevention. Tree roots help the soil absorb rainwater and slow down surface runoff. Deforestation (having no trees) causes water to run off the land rapidly, leading to severe flooding.

Severe water scarcity occurs when water bodies dry up due to prolonged droughts or over-extraction. This forces families to migrate to find water and causes immense suffering to local wildlife.

• Namami Gange Programme: A major national initiative dedicated to cleaning and protecting the Ganga river ecosystem.
• National Water Mission: Works to manage water resources efficiently and promote conservation across India.
• Water ATMs: Automated water dispensing machines used in some areas to provide clean drinking water in exchange for a card or coin, promoting wise water usage.

• Turn off the tap while brushing teeth.
• Do not waste drinking water.
• Fix leaking taps immediately with adult help.
• Reuse water left over from washing fruits and vegetables to water household plants.
• Spread awareness among family and friends because every drop counts.

• Longest River Bridge: India's longest river bridge is the Bhupen Hazarika Setu, built over the Brahmaputra River, stretching more than $9\text{ km}$ in length.
• Largest River Island: Majuli Island in Assam, formed by the Brahmaputra River, is the world's largest river island.
• Longest Earthen Dam: Hirakud Dam in Odisha is one of the longest earthen dams in the world, stretching over $25\text{ km}$.
• National Aquatic Animal: The Ganges River Dolphin is India's national aquatic animal. It is naturally blind and navigates using echolocation (sound waves).
• Fish Migration: Some fish, like the Hilsa (Ilish), travel from the sea into freshwater rivers to lay their eggs.