Quote:
Originally Posted by 4X4
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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The Elbow peaked almost 1000 cubic metres per second over normal flow. Lets go with that number because it's easy.
There are 604,800 seconds per week. That means 604 million m3 of excess water per week (this is probably too much as I'm sure the river could keep carrying a good chunk of it).
So if you build a reservoir with an average overall depth of 6m (20' deep, so much deeper in the middle to account for all the shallow areas) you need a reservoir that is 100km2 to hold one week of water, if you leave it bone dry otherwise.