Environmental and Social Impact Assessment - Gibe III

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Gibe III – Environmental and Social Impact Assessment 300 ENV R CS 002 C - A9003099 3.2 General layout The Gibe III hydropower plant includes the following main structures: • a Roller Compacted Concrete gravity dam with spillway and middle outlets • three hydraulic tunnels and two cofferdams for the river diversion • two hydraulic tunnels, penstocks and surge shafts for the power waterways • an outdoor Power House, equipped with No. 10 Francis turbines, and a switchyard • access roads The table below summarizes the main characteristics of the project (ref. Level 1 Design, 2008) illustrated in the following paragraphs. HYDROLOGY Catchment area (km 2 ) 34150 Average annual runoff (m 3 /sec) 438.2 (Mm 3 /year) 13820 10,000 years return peak flood (m 3 /sec) 10600 Probable maximum flood (m 3 /sec) 18660 Mean annual sediment yield (Mm 3 /year) 18.3 RESERVOIR Extreme flood level (PMF level) (m a.s.l.) 892.5 Max/Normal O.L. (max. ret. level) (m a.s.l.) 892 Minimum O.L. (m a.s.l.) 800 Total storage (Mm 3 ) 14700 Live storage (max. regulated capacity) (Mm 3 ) 11750 Surface area at max o.l. (km 2 ) 211 RCC DAM Crest el. (m a.s.l.) 896 Crest length (m) 610 Max. height above river bed (m) 223 Max. height above foundations (m) 243 Basic triangle opening 0.75 RIVER DIVERSION Diversion tunnels (No, D) (#, m) 3, 7/13.5 Cofferdam crest el. (m a.s.l.) 720 Design flood (m 3 /sec) 5200 CESI SpA - Mid-Day International Consulting Engineers Page 47
Gibe III – Environmental and Social Impact Assessment 300 ENV R CS 002 C - A9003099 SPILLWAY Type gated (overflow) Sill (m a.s.l.) 873 Sill length (m) 108 Radial Gates (No, W x H) (#, m) 9, 12x19 Design flood / Safety check flood (m 3 /sec) 10600 / 18660 MIDDLE OUTLETS Type, Number conduit in dam body, 2 Max. discharge (m 3 /sec) 800 Gates (No, W x H) (#, m) 2+2, 4x5.8 ECOLOGICAL DISCHARGE Type conduit from the power waterways Rated Discharge (m 3 /sec) 25 Gates type, number butterfly, No. 2 TEMPORARY ECOLOGICAL DISCHARGE Type conduit in diversion tunnel plug Rated Discharge (m 3 /sec) 35 Gates type, number butterfly, No. 2 POWER WATERWAYS Tunnels (No, D) (#, m) 2, 11 Penstocks (No, D) (#, m) 2, 7.5 Surge shaft (No, D, Top el., H) (#, m, m a.s.l., m) 2, 20, 915, 140 POWER HOUSE Type outdoor Dimensions (W x L x H) (m) 250 x 46 x 55 EM EQUIPMENT Turbines (No, IP) (MW) 10,187 Generators (No., phases, output) (#, #, MVA) 10, 3, 220 CESI SpA - Mid-Day International Consulting Engineers Page 48
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