Rich, The only way to -correctly- do this is with hydrodynamic modeling, such as with HEC-RAS. It can be very crudely approximated with r.damflood ( https://grass.osgeo.org/grass70/manuals/addons/r.damflood.html).
Tom On Mon, Oct 3, 2016 at 7:39 PM, Rich Shepard <[email protected]> wrote: > Reading the r.flow manual page suggests that the use of the '-u' > (upstream) option allows determination of flowlines and lengths that can be > used to delineate the area that would drain to a specific point. Is this > correct? > > To determine the area flooded if an outlet is plugged would require the > inverse of r.drain. That module calculates the area flooded with surface > water originating from a specific point; e.g., a hole in a dike or dam. The > closest I've seen to do the opposite seems to be r.flow. The quantity of > surface water and the rate of accumulation and infiltration into the vadoz > zone are not of interest, only the area flooded is needed. > > The modules listed under the Natural Hazards application page all appear > to delineate the area flooded from a point source. Can any of these be used > backwards to delineate the area flooded if an outlet is blocked? > > I'd appreciate pointers and suggestions based on cumulative experience > here for appropriate module(s). > > TIA, > > Rich > _______________________________________________ > grass-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/grass-user
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