Rule Curve of a Dam

The Supreme Court ordered the Tamil Nadu govt. to give information on the ‘rule curve’ for the Mullaperiyar dam.

What is Rule Curve?

The ‘rule curve’ in a dam decides the fluctuating storage levels in a reservoir.
The gate opening schedule of a dam is based on the ‘rule curve’. It is part of the “core safety” mechanism in a dam.
Rules curves are used to guarantee the safety of the reservoir as well as water security.

About Mullaperiyar Dam:

The Mullaperiyar dam is located on the confluence of the Mullayar and Periyar rivers in Kerala’s Idukki district.
The dam is located on the Cardamom Hills of the Western Ghats
It is operated and maintained by the neighbouring state of Tamil Nadu even though, the dam is located in Kerala.
The dam is operated by Tamil Nadu following an 1886 lease agreement for 999 years.
- It was signed between the Maharaja of Travancore and the Secretary of State for India during British Rule.
In the 1970s, the lease agreement was renewed by Tamil Nadu and Kerala.
- It gave the former, rights to the water from the dam, in return, Kerala receives rent from Tamil Nadu.

Source: TH

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