I found that my original hydrology model may not be using an appropriate scale. It was too coarse. Luckily, I think finer scale will only make the simulation longer and occupy more CPU time, nothing more.
Gully blocking will raise water table in and near the gullies. This can be modelled by defineing gully areas as with permenant water table in summer. But I think in winter there is no water even in blocked gullies (according to my observation in early March). This remains a question....
If I find modelling the whole area in a spatial-explicit way too exhausting, I may use a simplified model -- just see what are the hydrological conditions within a certain range from a gully, and use gully locations to get a estimation of hydrology for that area.
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