I'm quite new to hydrological analyses and Arc Hydro and trying to get my head around dealing with streams (artificial ditches rather) not exiting my DEM. I would like to "burn" these ditches into my DEM using "DEM reconditioning" but what I'm wondering is: will I need to apply some kind of sink structure as my ditches are not exiting the DEM? I believe the issue (i.e. the reason the ditches are not exiting the DEM) is that I am working in a semi-urban area and the ditches may actually be ending up in storm water systems. Could these somehow be considered sinks?
I apologize if the questions is a stupid one...I'm just really confused and any help would be really appreciated.