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Answer:
The peninsular rivers are mostly old rivers with a stable course. They flow over a hard, rocky plateau, have well-defined channels, and their drainage basins are smaller than Himalayan rivers. Most rivers such as the Godavari, Krishna, Kaveri, and Mahanadi flow eastwards because the Western Ghats form the main water divide running north–south along the western coast. The plateau gently slopes towards the Bay of Bengal, so rivers naturally descend eastwards. Additionally, the geological structure of Peninsular India, with its broken and uplifted blocks, channels water east. In contrast, only a few rivers like Narmada and Tapi flow west due to rift valleys and faulting.
Answer:
The deltas of Godavari, Krishna, and Kaveri form where rivers meet the Bay of Bengal and deposit rich alluvial soil. These deltas are flat and fertile, making them ideal for rice, sugarcane, and other crops. The fertile soil retains moisture and nutrients, increasing crop yields and supporting multiple cropping each year. Deltas also provide groundwater recharge, support fishing and aquaculture, and sustain dense human settlements. Irrigation networks like canals are easier to construct in flat delta areas, improving water distribution. Moreover, deltas act as natural buffers against coastal erosion and help maintain biodiversity in mangrove and wetland ecosystems, supporting livelihoods of local communities.
Answer:
The Narmada is unique because it flows westwards in a rift valley between the Vindhya and Satpura ranges, unlike most peninsular rivers that flow east. It rises in the Amarkantak hills and follows a straight course to the Arabian Sea, joining the sea through an estuary rather than a delta. Notable natural features include the Marble Rocks near Jabalpur, where the river passes through a deep gorge, and the Dhuadhar Falls where it cascades over steep rocks. Its tributaries are short and join at right angles, which is typical of rivers flowing in faulted valleys. The Narmada’s flow regime, scenery, and geological setting set it apart from other peninsular rivers.
Answer:
West-flowing rivers such as Narmada and Tapi typically flow through rift valleys or faulted depressions formed by tectonic activity. Their valleys are often narrow, more straight, and they end in estuaries on the Arabian Sea. Their tributaries are short and meet the main river at right angles. In contrast, east-flowing rivers like Godavari and Krishna flow across the degraded plateau toward the Bay of Bengal, forming wide, meandering courses and broad drainage basins. They carry more alluvium to build deltas at their mouths. The difference arises from regional slope, geology, and the position of the Western Ghats which directs most rivers eastwards.
Answer:
The Godavari is called the “Dakshin Ganga” (Ganges of the South) because of its large size, long course (about 1,500 km), and its role as the biggest peninsular river. Like the Ganges, it drains a vast area, supports dense population, and provides water for agriculture, industry, and cities. Its basin covers parts of Maharashtra, Madhya Pradesh, Odisha, and Andhra Pradesh, supporting diverse crops and irrigation projects. The river has many tributaries (Purna, Wardha, Pranhita, Manjra, Wainganga, Penganga) which increase its water volume and usefulness. The Godavari’s fertile plains and delta are crucial for food production, while its water supports power generation, navigation, and cultural activities.
Answer:
Peninsular river basins are smaller because these rivers drain an old, stable plateau with limited mountain catchments, whereas Himalayan rivers originate from high ranges, collect water from large glaciated areas, and receive more precipitation, resulting in large, interconnected basins. The peninsular plateau is broken into many small basins by ridges like the Western Ghats, reducing catchment area. Implications: smaller basins mean lower perennial flow and greater seasonal variability, making water availability less reliable. For management, this requires careful storage (reservoirs), efficient irrigation (drip, canals), watershed conservation, and inter-basin transfers in drought years. Policies must focus on rainwater harvesting and sustaining groundwater to handle scarcity and seasonal fluctuations.
Answer:
Building a large dam near Tungabhadra would store water for irrigation and hydroelectricity, which could boost upstream agriculture and power supply. Downstream effects include regulated flow, which can ensure water during dry months but may reduce natural floods that deposit fertile silt, affecting delta fertility and crop yields. Reduced sediment supply can cause coastal erosion and degrade wetlands. Ecosystems relying on seasonal floods—fish breeding, wetlands—may be harmed, reducing biodiversity. Urban areas downstream could benefit from stable water supply and flood control, but they may face reduced riverine resources and possible displacement or changes in livelihoods for communities dependent on natural flood cycles. Balanced dam management is needed.
Answer:
Estuaries of west-flowing rivers like Narmada and Tapi are narrow, salty-freshwater mixing zones with strong tidal influence. They support mangroves, fisheries, and act as ports; economically they aid fishing, navigation, and salt pans. Ecologically, estuaries have rich biodiversity but less agricultural land. Deltas of east-flowing rivers such as Godavari, Krishna, Kaveri are wide, flat, and made of nutrient-rich alluvium, ideal for intensive agriculture (rice, sugarcane). Deltas support larger human settlements, irrigation networks, and aquaculture. However, deltas are vulnerable to flooding and sea-level rise, while estuaries face pollution and coastal erosion. Both systems need tailored conservation to balance economic use and ecological health.
Answer:
A conservation plan for Narmada should include:
Answer:
Challenges include short river length, steep gradient, small catchments, and limited storage because the coastal plain between the Western Ghats and the Arabian Sea is narrow. Rivers have flashy flows during monsoons and low flow in dry months, making irrigation unreliable. Saline intrusion near the coast can affect water quality. Practical solutions: build small check dams and percolation tanks to store monsoon water and recharge groundwater; promote micro-irrigation (drip and sprinkler) to conserve water; implement watershed management in highlands to increase runoff capture; use community-managed water harvesting and conjunctive use of groundwater; and cultivate less water-intensive crops suited to the coastal environment.