Once you knew that rivers could be used in that way, from seeing it other places, you might try to dredge and deepen sections, and later canalize them. But that would take large organised groups, and upkeep.
And explosives--some of those rapids are over basalt.
The devil is in the details. Even with large organized groups, you'd need to have a central channel deep enough to handle dry-season levels, and that would probably run too fast in the rainy season for river-side fishermen to catch as much.
I lived by the coast where the rivers are nice and wide--and bridged. I never saw those rapids.
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Once you knew that rivers could be used in that way, from seeing it other places, you might try to dredge and deepen sections, and later canalize them. But that would take large organised groups, and upkeep.
And explosives--some of those rapids are over basalt.
The devil is in the details. Even with large organized groups, you'd need to have a central channel deep enough to handle dry-season levels, and that would probably run too fast in the rainy season for river-side fishermen to catch as much.
I lived by the coast where the rivers are nice and wide--and bridged. I never saw those rapids.
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