arranged or mounded up on the edge (e.g. snow on the edge of the street or mud on the edge of the riverbank; deposited, put for safekeeping (as in the bank)
A banked stretch of road is higher on one side than the other. He struggled to hold the bike down on the banked corners
If a place is banked with something, it is piled high with that thing. If something is banked up, it is piled high. Flowerbeds and tubs are banked with summer bedding plants The snow was banked up along the roadside. = piled