How can the length of the inflow and outflow boundary conditions, along a model domain border, impact the rivers response to such inflow and outflows respectively?
I attached a visual representation of my question for added clarity, if needed. The Red Lines represent the "Long BC" which was part of the training exercise provided on the FHWA/Aquaveo SMS Training website and defined according to the provided instructions from the website. The yellow line represents another possible option to define the boundary condition for the river response as the "Short BC" line.
What is the best manner to determine if a "Long BC" or a "Short BC" is needed for a model domain?