this post was submitted on 29 Oct 2025
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Room for the river: The future of Hawke's Bay's Ngaruroro River (www.rnz.co.nz)
submitted 2 weeks ago by rimu@piefed.social to c/newzealand@lemmy.nz
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This is pretty interesting! I like the bits where they show the 1950s aerial view vs the present ones to show how the river changed.

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[–] TagMeInSkipIGotThis@lemmy.nz 3 points 2 weeks ago

That was the maths I was working with too - but seemingly there's two parts to it, capacity between the banks and flow rate of the river in flood and for the latter wider is better.

So presumably you can build lower, cheaper stop banks further apart for slower flood velocity and less risk of stop bank failure at the expense of more risk of stop bank overtopping.