Hi Users on the list To trace back the overland flood mechanism in (sub)urban area I've done some experiments in grass. (Sub)urban areas has in general a sewer-system (combined or storm). One of the design-parameters of a sewer is the maximal capacity of rainfall, in most cases e sewer is design to carry off about 20mm/h rain.
In case of very heavy storm about 60 mm/h the sewer becoms full and an overland flood mechanism come into being. I've a 5x5 meter grid DEM of the area. In grass there are several modules to simulate overland flood. * r. terraflow * r.watershed * r.topmodel * r.topidx ... What is the most useful module(s) in grass to simulate overland flood mechanism? First I used the r.terraflow module the resulting accumulation map is here: Terraflow accumulation map <ftp://192.168.2.107/houtblerick/teracc.png> Using the r.watershed module resulting streammap is here: Watershed stream map <ftp://192.168.2.107/houtblerick/wsstream.png> In both maps the red boxes are the complaints of water flood A foto of the real situation is here Foto <ftp://192.168.2.107/houtblericj/Holleweg.jpg> Thanks Joop Goedbloed
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