Just a half assed idea here, but maybe instead of a really expensive flood tunnel, we could do a little more business with the Tsuu Tina, and build a dry reservoir on their land, that we lease, which only gets used when the Elbow gets threateningly high.
Move around some earth to build a basin in an existing valley near the Elbow, and then build a diversion canal from the Elbow. Sounds wayyy cheaper than tearing up Heritage Drive and building a 5+ km tunnel. Plus the Tsuu Tina get some residual income out of it, and maybe we become (slowly but surely) business partners in many ways.
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