Irregular Weir

The Irregular Weir can be used to model in-line flows over jagged or irregular weirs where flow to / from the irregular weir occurs at the attached node.

Flow over an irregular weir is calculated by splitting the calculation into determining flows over segments using an integrated form of the weir equation for dry, free and drowned modes. These flows and associated matrix coefficients are then summed together subject to stability constraints, to give values over the entire spill.

See the River Reach - Bank Flows topic for information on flow calculation.