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When modelling irregular culverts, the shape of culvert usually varies along its length as well. EX: Culvert having 900mm dia at inlet, varies along its length and at outlet has 500mm. Can this be included in the options for transition of shape along the length of culvert?
Normally this is done by breaking up the culvert into links with a break node in the middle. You would have to worry about entrance or exit losses along the link and the conduit table of ICM would have to be expanded to have non prismatic characteristics along the culvert.