Priority-Flood depression filling (Barnes, Lehman & Mulla 2014). Every cell is raised to the
lowest level water there could spill out at, through the map edge or into the sea. With
epsilon > 0 filled flats also get a tiny gradient (Priority-Flood+ε), so every cell has a strictly
lower neighbour and flow routing never gets stuck.
Priority-Flood depression filling (Barnes, Lehman & Mulla 2014). Every cell is raised to the lowest level water there could spill out at, through the map edge or into the sea. With
epsilon > 0filled flats also get a tiny gradient (Priority-Flood+ε), so every cell has a strictly lower neighbour and flow routing never gets stuck.