On Thu, 16 Feb 2017, Laurent C. wrote:
Culverts usually don't appear on a raster DEM. For instance, if you use LiDAR DEM, you will have only the elevation of the road surface.
Laurent, The culvert is below the road surface and about 60cm above the bottom of the roadside swale.
To model a functioning culvert, you will need to lower locally the DEM to let the flow pass. Therefore, I'm not totally sure to understand how you modelled the functioning culvert without changing the DEM.
I'm re-running the analyses taking a slightly different approach and will carefully modify the DEM so the cells with the culvert (in- and outflow) have the appropriate elevations. If I correctly recall reading the Itzi technical information I can generate time series. I'll re-read everything and figure out how to model the flows given daily precipitation rates (mm/hr for each day) over a three week period, with saturated soils from antecedent precipitation. Thanks, Rich _______________________________________________ grass-user mailing list [email protected] https://lists.osgeo.org/mailman/listinfo/grass-user
