Conclusions
The HEC-RAS model proved very helpful in gaining a better understanding the hydraulics at the Rockton Hydroelectric plant, specifically in the power canal. using information obtained from the model combined with collected powerhouse information, flow principles, and stream flow measurements, the following conclusions were reached:
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- Locations where overtopping will occur first were determined using the model, and are shown in the picture above. The first location to overtop is sta 1+00, followed by 19+00, then 30+00. Of these three locations, 19+00 is the most concerning because it poses the biggest threat of damages to the city of Rockton. The other locations would drain into a large grass field (30+00) or a small grassy area next to the powerhouse (1+00), both far away from human developments.
- Times between the utility trip and overtopping were determined for each of the three locations under different scenarios. Times under the proposed (40%) scenario were 28, 33, and 35 minutes. Although this may not seem like much time, it is nearly double the time it takes to overtop under current conditions. This means automating wicket gate response will significantly reduce the chances of flooding Rockton.
- Based on historical river flow data and simulations conducted using the model, it was concluded that a control device at the wicket gates alone will not be sufficient to prevent overtopping of the power canal.
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