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Environmental Impact
This project had very little environmental impact on the Miers valley. Two of the studies, however, resulted in minor impact:
| 1. | The construction of the weirs resulted in minor channel modification and an overflow channel on the Adams stream was diverted to bring all the flow together above the weir. This diversion was constructed using a hessian embankment and the channel deepened itself naturally with the flow. So effective was this diversion in its first year (1988-89) that it appears to be unnecessary during the past season. Some sand bagging was also required to safeguard the integrity of the weirs and prevent erosion. While hessian sacks were in the main used some "blue" plastic rubbish bags were also used. The majority of these were removed at the end of last season and the five which remain are well buried. These remaining bags should, however, remain intact in the weirs and not present an environmental problem. They will be removed with the weirs once they are no longer needed. |
| 2. | The provision of permanent benchmarks around the margins of the glaciers required the installation of "terrier" bolts into prominent rocks. These sites are invisible except where cairns and other markers have been used to surveying purposes. |
| 3. | The only other evidence of our presence in the valley are the numerous foot prints left as we travelled to sites of specific interest. These, however, appear to be "softened" very rapidly by the high winds experienced during the winter The prints left after the 1989-90 season were hardly discernable after the past winter and certainly would not be visible after a further couple of winter seasons. |
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