Correct Option
The correct option isThe delta region
Explanation
The Mettur Dam, also known as the Stanley Reservoir, is one of the largest dams in India, constructed across the Cauvery River in the Salem district of Tamil Nadu. It serves as the primary water storage structure for the state's agricultural needs.
Detailed Analysis
- The Delta Region (Correct): The specific purpose of the Mettur Dam is to regulate the flow of the Cauvery River into the Cauvery Delta Zone. This water irrigates the fertile alluvial plains in districts such as Thanjavur, Tiruvarur, and Nagapattinam. This region is famously known as the "Rice Bowl of Tamil Nadu" because of the paddy cultivation supported by the dam.
- The Coastal Region: While the delta is situated along the coast, the term "coastal region" is geographically broad and includes areas not served by the Cauvery system. The irrigation network is specifically tailored for the deltaic plains.
- The Plateau Region: The dam is located near the edge of the plateau (Salem), but the stored water is released downstream for the lower-lying plains, not pumped back to irrigate the upland plateau significantly.
- The Hilly Region: The hilly regions (Western Ghats) act as the catchment area where the river originates and gathers volume. They are the source of the water, not the beneficiaries of the irrigation system.
Key Takeaway: The Mettur Dam is the lifeline of the Cauvery Delta, providing essential irrigation water that sustains the "Rice Bowl" of Tamil Nadu.