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Originally Posted by Authentic_City
Hmmmm... don't all rivers change elevations continually - gravity is what keeps the water moving, right?
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Yes.
Quote:
Originally Posted by Authentic_City
It's only a sudden change in elevation that necessitates a lock (e.g. the Red drops 13 feet before Lister Rapids, where Lockport is now).
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No, this is not true. First off, Lister Rapids is south of Rivercrest, at least 10 miles south of Lockport, and is not the only feature on the river that makes the locks necessary. Lister Rapids also is not a "change of elevation", it is a rock outcropping on the river bed, just one of many. There is also one in Parkdale where the River Rouge ran aground some years ago. These outcroppings are the reason for the locks.
Quote:
Originally Posted by Authentic_City
There's no sudden drops on the Assininboine between the park and downtown Winnipeg. The river is already navigable (notice the old swing rail bridge at Rte. 90), just not in very low water in the summer. Even in summer, the only really shallow spots are around the St. James Bridge and Assiniboine Park (still quite a bit deeper than "ankle deep", however). It wouldn't take much to dredge a deeper channel, if money was no object.
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The bottom is rock. Excavating rock is expensive. Ask Hydro.
The river is ankle deep during normal summer flows east of the park. How deep it is at the park is irrelevant.
If you think the Boine is navigible, go navigate it. You wouldn't be the first to try. Just bring several spare propellers. The is a reason there is a sign on the pipe bridge at Aubrey Street warning boaters not to proceed further.
Quote:
Originally Posted by Authentic_City
The Assiniboine can be dredged. It's not solid rock on the bottom. In fact, in the late 1990s, a 420 meter stretch of the Assiniboine was dredged in Brandon (widened by 20 m to a depth of 2 m) to construct a waterski facility.
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No point trying to explain this one.