If it is overland flow, I'd lean towards using the 2D equations. So for me, if it's an elevation connection, I'd lean towards the weir. Although the 2D equations come with their own subjective assumptions and limitations: terrain quality, theta value, eddy viscosity, full momentum or diffusion wave, etc, etc. The weir equation requires a very subjective weir coefficient. I like to think about the input data required and how confident I am with it. Toby-Great questions! the quick answer is: "if it is acting like a weir, model it as a weir, otherwise model it with the 2D equations." However, as with many things in RAS, there's a lot more nuance involved.
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