Dams & Hydro
Geotech
Advanced Numerical Analysis
Resolving Drainage Design Conflicts In A Dam Raising Project
SANCOLD 2025 ANNUAL CONFERENCE 5-6 November 2025
By N Geldenhuys, ARQ Dams Pty Ltd
-co-author, HJ Wright
The Tzaneen Dam, built in the 1970s, requires upgrades to meet modern standards. A key design component, the downstream toe drain, was re-evaluated as part of the raising project. However, discrepancies between the original design drawings and the actual constructed system resulted in design changes during construction. Comprehensive investigations, including surveys, excavations, inspections, and water quality tests, were undertaken to determine existing conditions and finalise the alternative design for implementation. This paper highlights lessons learned, emphasising the importance of accurate as-built records, thorough site investigations, and adaptable approaches in both design and construction phases.
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