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1 LESOTHO HIGHLANDS WATER PROJECT PHASE 2 OVERVIEW By P D Pyke October 2012.

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Presentation on theme: "1 LESOTHO HIGHLANDS WATER PROJECT PHASE 2 OVERVIEW By P D Pyke October 2012."— Presentation transcript:

1 1 LESOTHO HIGHLANDS WATER PROJECT PHASE 2 OVERVIEW By P D Pyke October 2012

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3 Yield analysis - Polihali Dam yield ( MOL 1992, FSL 2065) viewed in isolation: – 14,75 m 3 /s 465mil. m 3 /a Incremental Orange River system yield – 5,76m 3 /s 182 mill.m 3 /a

4 Phase 1 Dams Yield m3/annum 24.7 m3/s Polihali Contribution to System Yield (of LHWP) m3/annum m3/s Total LHWP Phase1 and Phase 2 Yield m3/annum 40.3 m3/s - but also need yield replacement dam for Orange River Polihali Yield Analysis

5 Main Embankment Main dam Maximum height163.5 m Essential Excavation m 3 Dam fill volume m 3 U/s and d/s slopeu/s 1: 1.4 d/s 1:1.25, average 1:1.4 Crest width / length10 / 915 m Reservoir Volume2 322 million m 3 Surface area50.4 km 2


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