MIKE-SHE allows irrigation sources to be set as a river reach chainage range or from the subsurface.

In the area I am modelling most irrigation is from storage dams as the river flow can drop very low during the irrigated period. 
How can I include this with MIKE-SHE/MIKE-Hydro?

I see that I can add storage reservoirs to the channel network in MIKE-Hydro, but these seem to be separate elements from the river branches. I can't see an option to irrigate from a storage reservoir in the MIKE-SHE interface, only river branches.
Do the storage elements have an associated branch and chainage range that could be input in the irrigation source specifications in MIKE-SHE? How can I tell?

Thanks for your help!