Salient Features of the Old Mullaperiyar Dam and proposed New Dam
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New Dam: Type of Dam: Concrete gravity Top level of dam: 874.69 msl Deepest bed level: 850 msl Deepest rock level: 820.53 metres Height of dam (Max) 46.90 metres Maximum water level: 873.19 msl (155 feet from base) Spillway crest level : 867.4 msl (136 feet) Full reservoir level: 867.4 msl (136 feet) Gross storage at FRL: 321.48 million cubic metre (11353 million cubic feet) (Capacity of existing dam at FRL of 136 feet is 11210 million cubic feet) Location: About 300 metres downstream of existing dam. |
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Dam: Type of Dam: Composite gravity Location 9o 31' 30" N; 77o 8' 45" E Length: 366 metres Catment area: 624 sq. km. Full reservoir level: 872.285 msl (46.33 metre / 152 feet from base, reduced to 136 feet following weakening of dam) Maxium water level: 873.20 msl (47.24 metre / 155 feet from base) Dead storage level: 857.65 msl (104 feet from base) Capacity of reservoir at FRL of 152 feet: 15662 mcft ( 443.5 million cubic metres) Height of dam from the deepest foundation: 53.64 metre (176 ft.) Top of dam including parapet: 48.16 metre (158 ft) from base Top width of dam with parapet (orginal): 3. 66 metre (12 feet) Top width of dam with parapet (after repairs): 6.40 metres (21 feet) Spillway: Location: Right saddle Crest level 41.45 metre (136 feet) Number of vents: 13 including 3 new vents added. Baby dam Location: Left bank saddle Type: Composite gravity structure Top of dam: 48.17 metres (158 feet) Length of dam: 73.15 metres (240 feet) Height of dam: 16.48 metres (54 feet) Diversion Tunnel Length: 1920 metre (6300 feet) Still level of tunnel: 31.70 metre (104 feet) Shape: Horse shoe, concrete lined Area of present cross section: 14.1 sq. m. (151.67 sq. ft.) Carrying capacity (new): 59.51 Cumecs (2100 Cusecs) Carrying capacity (old): 36.84 Cumecs (1300 Cusecs) BACK Home |
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