What is the proper way to model an outlet structure that is designed with an inlet pipe from the pond then has a broad crested weir in the middle of the sructure and then on the oulet side has another outlet pipe. I have attached a sketch of the structure. I am questioning the proper routing since the water will be originally flowing into the 24" pipe then for low flows will go through the 6" orifice in the weir, then at higher flows overtop the weir and finally through the outlet pipe.