Currently, I have an InfoWorks CS model that includes a raw water system from one reservoir to another. Raw water needs to go through a number of filter beds at the u/s end of this system.

I have been asked to model these filters beds and the most important thing is to account headlosses that occur due to the presence of gravel within a filter bed.

At this moment, I modelled these filter beds as an OREC conduit, but not really sure how to apply this type of headlosses.

Does anyone know or aware of the approach that can be used in my case?