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 Table 5.44: Rainfall rates, runoff coefficients and flows for the main sub-catchments of the Omo River. ................................................................................................................................................ 162 Table 5.45: Runoff coefficients for the main sub-catchments of the Omo River...................................... 162 Table 5.46: Monthly variability of runoff at Lake Turkana. ..................................................................... 163 Table 5.47: Existing and potential small scale irrigation scheme in the Lower Omo area........................ 172 Table 5.48: Livestock Population by Wereda in the Lower Omo Area .................................................... 175 Table 7.1: Loss of Natural Vegetation..................................................................................................... 203 Table 7.2: Households and Land Affected by Project Component and Wereda ..................................... 212 Table 7.3: Number of Residential Houses Affected by Project Component ........................................... 213 Table 7.4: List of Affected Pas by the Gibe III Reservoir....................................................................... 216 Table 7.5: Loss of Advantages ................................................................................................................ 222 Table 7.6: List of Existing and Proposed Hydropower Project ............................................................... 237 Table 7.7: Synthesis of Environment Impact Matrix............................................................................... 244 Table 9.1: Land lost weight ..................................................................................................................... 257 Table 9.2: Impact of land lost (Ha).......................................................................................................... 258 Table 9.3: Impact of affected people ....................................................................................................... 258 Table 9.4: Impact of access reduction ..................................................................................................... 258 Table 9.5: Impact of cultural heritage ..................................................................................................... 258 Table 9.6: Impact of downstream effect.................................................................................................. 259 Table 9.7: Impact on ecosystems............................................................................................................. 259 Table 9.8: Scheme Impact Score ............................................................................................................. 259 Table 9.9: Impacts of the Gibe III HPP ................................................................................................... 260 Table 9.10: Impact Score of the Gibe III HPP........................................................................................... 260 Table 9.11: Impact Scores of different schemes considered in EPSEMP, of GG II HEP and GibeIII...... 261 Table 9.12: Installed Capacity/ Impact Scores of different schemes considered in EPSEMP, of GG II HEP and Gibe III ............................................................................................................................ 261 Table 10.1: Environmental Management Framework............................................................................... 265 Table 11.1: Environmental Monitoring Framework.................................................................................. 272 Table 12.1: Summary of estimated environmental mitigation, monitoring, RAP and training cost ......... 282 CESI SpA - Mid-Day International Consulting Engineers Page vii
Gibe III – Environmental and Social Impact Assessment 300 ENV R CS 002 C – A9003099 List of Figures Figure 0.1: Location Map of the Project Area .............................................................................................. 2 Figure 0.2: Administration Map around the Reservoir Area ........................................................................ 3 Figure 0.3: General Layout of the Site Installations ..................................................................................... 5 Figure 0.4: Chida - Sodo Road Realignment Change................................................................................... 6 Figure 2.1: The SNNPR Region, Zones and Weredas................................................................................ 35 Figure 3.1: Gibe III project area ................................................................................................................. 45 Figure 3.2: Gibe cascade location............................................................................................................... 46 Figure 3.3: Access road to the dam site ...................................................................................................... 51 Figure 3.4: Tunnels rating curve................................................................................................................. 52 Figure 3.5: Spillway rating curve (gates fully open) .................................................................................. 56 Figure 3.6: Water profile and velocity on the chute with the PMF............................................................. 57 Figure 3.7: General Quarries Location .......................................................................................................66 Figure 3.8: Detail of the river alluvium and basalt quarries ....................................................................... 67 Figure 5.1: Annual Isohyetal map reported in the Omo River Master Plan ............................................... 75 Figure 5.2: River system of the catchment area.......................................................................................... 95 Figure 5.3: Gibe III basin DTM.................................................................................................................. 96 Figure 5.4: Annual Isohyetal map reported in the Omo River Master Plan ............................................... 98 Figure 5.5: Monthly rainfall at Wolkite station (1985-2004) ................................................................... 101 Figure 5.6: Monthly rainfall at Bonga station (1953-2003)...................................................................... 101 Figure 5.7: Annual runoff for the Shebe station on the Gojeb River........................................................ 104 Figure 5.8: Gibe III Basin – Regional Areal Rainfall Curves................................................................... 112 Figure 5.9: Gibe III Basin - HEC HMS Hydrologic model ...................................................................... 113 Figure 5.10: Gibe III Dam Site – Extreme Flood Hydrographs.................................................................. 118 Figure 5.11: Land Cover of the Gibe III Reservoir Area............................................................................ 123 Figure 5.12: Administration Map around the Reservoir Area .................................................................... 138 Figure 5.13: Ethnic Groups Map in the Omo Valley.................................................................................. 141 Figure 5.14: Land Cover along the Lower Omo River............................................................................... 160 Figure 5.15: Average monthly runoffs at Gibe III, Residual and Lake Turkana. ....................................... 163 Figure 5.16: Location of Recessions Agriculture Sites along the Lower Omo River................................. 169 Figure 5.17: Locations of Existing and Potential Irrigation Sites along the Lower Omo River................. 173 Figure 5.18: Locations of Fishing Sites along the Lower Omo River ........................................................ 179 Figure 5.19: Locations of National Parks and Other Protected Sites along the Omo River ....................... 181 Figure 7.1: Locations of the Proposed Buffer Area .................................................................................. 208 Figure 7.2: Locations of Affected Road Section and River Crossing Sites along the Omo River ........... 224 Figure 7.3: Comparison of Monthly flows with and without Gibe III...................................................... 227 Figure 7.4: Monthly flows at Lake Turkana: average 1964-2001 ............................................................ 228 Figure 7.5: Monthly flows at Lake Turkana: dry year 1987 (min flows) ................................................. 228 Figure 7.6: Overall layout of the Gibe Hydroelectric scheme .................................................................. 238 Figure 7.7: General Layout of the Gibe Cascade...................................................................................... 239 Figure 12.1: Schedule for Implementation of Environmental and Social Mitigation, Management and Monitoring Plan ...................................................................................................................... 279 CESI SpA - Mid-Day International Consulting Engineers Page viii
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Environmental and Social Impact Assessment - Gibe III

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