A long standing drawback of GREAT-ER was the lack of a really free
distributable geographic data set. To overcome this with GREAT-ER II
CEFIC LRI contracted for the digitization of a catchment. The Itter catchment
has been choosen since it is small but validated.
Its applicability for environmental modelling has been proven by various
The Itter Catchment
The Itter is a small tributary to the Rhine in a region of high
population density. The source is located in Solingen, 20 kilometers downstream
the Itter meets the Rhine (in Duesseldorf-Benrath). A mayor tributary to the
Itter is the Lochbach.
The Itter drains waste water of approximately 150,000 persons plus industrial
waste water discharged from three municipal treatment plants. At low flow
approximately 80 percent of the water flow are coming from the STPs. The
contribution of the Itter to the Rhine is about 0.7 m^3/s (at low flow).
Itter Catchment displayed by Thuban (Map Projection Gauss-Krüger Zone 2)
The Geographic Data
The catchment boundary was generated by Dr. Carsten Schulze during his
Diplomarbeit at the Institute of Environmental Systems Research (USF) at the
University of Osnabrueck joined with Henkel KGaA, Duesseldorf. Thankworthy the
data was made freely available. Also the attribute data has been provided by
The discharge sites and the river network have been digitised by Intevation
GmbH on behalf of CEFIC LRI. Based on aerial photos provided by the
Bergisch-Rheinischer Wasserverband (BRW) the river network has been created
The discharge - stretch link layer finally has been generated automatically by
the GREAT-ER II pre-processing.
While the data is provided in geographic coordinates, an appropriate
map projection for presentation is "Gauss-Krger Zone 2". See the files
itter.thuban or itter.prj (distributed with the data) for details.
The shapefile version can be downloaded directly:
itter-catchment-1.0.0.zip [33 Kb]
/ itter-catchment-1.0.0.tar.gz [33 Kb]
The source files (ie. text-formats) are part of the
GREAT-ER pre-processing package.
Itter Catchment Data
Copyright (C) 2003, Intevation GmbH
This data is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This data is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this data (file COPYING); if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Diplomarbeit C.Schulze (german)