Lease Deed of 1886 and Supplemental Agreement
Deterioration of the Dam due to continuous leaching of lime
Strengthening carried out during 1980s
Litigation in the Hon’ble Supreme Court
Amendment Act of 2006
PMF and flood routing studies done by CWC
PMF studies done by IIT, Delhi
Seismic studies conducted by IISc, Bangalore and CESS, Trivandrum
Site Specific Seismic Study and Dynamic Analysis done by IIT, Roorkee
- The Main Mullaperiyar Dam even under DBE condition (seismic co-efficient of 0.12g) under reservoir level of 136ft, the value of tensile stresses are found more than double the ultimate apparent seismic tensile stresses. The MCE condition makes the things much worse.
- Even without earthquake forces, the Main Mullaperiyar Dam is unsafe for flood conditions (MWL) since the tensile stresses in the heel of the dam are found to be more than double the permissible apparent tensile stresses.
- In the normal operating conditions, the tensile stresses in the Mullaperiyar Dam at the heel are at the border level of the allowable stresses.