dinating workshops. Based on these prerequisites, the applied 
synergetic approach consists of the following common Work 
Packages (WPs): 
(i) Generating individual catchment data bases containing all 
remote sensing and GIS coverages for the end users to be used 
during the term of the project and afterwards for the operational 
catchment management by the end user. 
(ii) Identifying parameters and variables of the end user’s models to 
be parameterized by means of a sound systems analyses, which 
is based on the close cooperation between research partners and 
their respective end users. 
(iii) Classifying the physiographic properties comprises the 
spatial heterogeneity of the test catchments and . makes 
use of multitemporal, multispectral and multisensoral 
remote sensing techniques. By processing data from 
Landsat TM, SPOT, IRS-1C, ERS-2 and JERS-1 with 
color composites of optical and microwave data, a 
maximum classification accuracy can be achieved. This 
approach is of advantage for the selected meso-scale 
catchments, particularly for those areas with limited 
accessability. 
(iv) Delineating Response Units (RUs) by means of GIS overlay 
analyses of raster coverages containing topography, soils and 
land use information (Fliigel, 1995, 1996): 
- Hydrological Response Units (HRUs); 
- Erosion Response Units (ERUs); 
- Chemical Response Units (CHRUSs). 
Further grid cell analyses within the GIS will reveal insight into 
their spatial distributed heterogeneity such as connectivity and 
neighbourhood required by the end user's models to route water, 
sediment or solutes within the river catchments. 
(v) Parameterizing end user model parameters and variables by 
means of GIS analyses using attribute tables within the GIS 
database. 
(vi) Validating the parameterization by cost-benefit analyses (cost 
of information per km?) and verification of parameters against 
both field data and empirical methods. 
The synergetic approach applied within the project is not restricted to 
make use of remote sensing as a "stand alone" technique but as a 
powerful analysing toolset complementary and integrated to those 
already existing in water resources management and modelling. 
Therefore, the benefit and cost-effectiveness of this toolset can be 
demonstrated and evaluated within the context of the integrated water 
resources management system applied. 
The interrelationships between the IEC components, their respective 
climatic regions and the cooperation between RETS and associated 
WPs is shown in Figure 2 and especially in Figure 4. 
REFERENCES 
Flügel, W.-A., 1995. Delineating Hydrological Response Units 
(HRUs) by GIS analysis for regional hydrological modelling using 
PRMS/MMS in the drainage basin of the River Broel, Germany. 
Hydrological processes, 9, pp. 423-436. 
Flügel, W.-A., 1996. Hydrological Response Units (HRUs) as 
modelling entities for hydrological river basin simulation and their 
methodological potential for modelling complex environmental 
process systems - Results from the Sieg catchment. Die Erde, 127, 
pp. 43-62. 
120 International Archives of Photogrammetry and Remote Sensing. Vol. XXXII, Part 7, Budapest, 1998 
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