Drain or fill closed depressions.
Variety of algorithms: filling,
excavating, carving, minimum impact, ...
Current strategy:
1)Attempt to “carve”; cut a channel along probable flow
path to drain closed
depressions.
2)If a good “probable flow path” cannot be found, fill to
level of pour point.
This obliterates any topography within the depression – bad.
3)Currently experimenting with alternatives.