[GRASS-user] r.flow: define contributing area

[Thomas Adams]

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 <rshepard at appl-ecosys.com>
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
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