Solution:

• The Thenmala dam is the second largest irrigation project in Kerala, India.
• It impounds the longest reservoir in the state and water from the reservoir is also used for power generation.
• The dam was started in 1961 under the Kallada Irrigation and Tree Crop development project with an original cost of Rs. 13.28 crores.
• The revised estimate of Rs. 728 crores at the 1999 schedule of rates made the cost escalation to be reported at 5,356 per cent.
• The ayacut targeted was 61630 hectares (net) and 92800 hectares (gross).
• Though the project was targeted for completion, and priority in allocation was given during Ninth Plan, it could not be completed and commissioned fully.