LESOTHO HIGHLANDS WATER PROJECT PHASE 2

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LESOTHO HIGHLANDS WATER PROJECT PHASE 2
OVERVIEW By P D Pyke October 2012
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Yield analysis - Polihali

• Dam yield ( MOL 1992, FSL 2065) viewed in
  isolation
• 14,75 m3/s 465mil. m3/a
• Incremental Orange River system yield
• 5,76m3/s 182 mill.m3/a

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Polihali Yield Analysis

• Phase 1 Dams Yield
• 780 106 m3/annum
• 24.7 m3/s
• Polihali Contribution to System Yield (of LHWP)
• 465 106 m3/annum
• 14.75 m3/s
• Total LHWP Phase1 and Phase 2 Yield
• 1271 106 m3/annum
• 40.3 m3/s - but also need yield replacement
  dam for Orange River

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Main Embankment
Main dam
Maximum height 163.5 m
Essential Excavation 40 000 m3
Dam fill volume 12 311 210 m3
U/s and d/s slope u/s 1 1.4 d/s 11.25, average 11.4
Crest width / length 10 / 915 m
Reservoir Volume 2 322 million m3
Surface area 50.4 km2