Abstract
The Kiewa Hydro-Electric Scheme is a 184-MW hydro-electric facility in south-eastern Australia. Construction of the facility occurred predominantly between 1946 and 1961. Hydrological data spanning the 1925–1960 period is examined to determine the impact of construction works on streamflow, base-flow and quick-flow characteristics. A combination of non-parametric tests and descriptive hydrological analyses are used to examine three facets of construction activity. Reservoir construction that required the removal of vegetation and movement of earth material resulted in statistically significant changes in runoff. Likewise, power station construction activities that included movement of earth materials and construction of roads and power lines also resulted in statistically significant changes in runoff. However, subsurface tunnelling was accomplished independently of any changes in surface runoff. The increased runoff occurred in both subalpine and mountain catchments, which was particularly noticeable during storm events, and for one stream increased runoff was sustained for at least a decade.
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