Transcript Hydrogeology and Lan..

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Catchment
Descriptors
Data Acquisition
Land Use
Use and
and Hydrogeology
Hydrogeology
Land
Remote sensing was used to derive land use
for the area (Landsat TM, 30 x 30 m grid, 1993). It
was classified into 16 classes, which were aggregated
to four groups; forest, farmland, grassland and
settlements/urban areas.
Only the relative proportion of forest and
urban areas were chosen to be included in this selfguided tour.
URBAN - Percentage of urbanisation [%]
GEOHCMEAN – Weighted mean of hydraulic
conductivity [m/s]
GEOVLHP – Percentage of rock formations with a
very low hydraulic permeability [%]
From a 1:350,000 scale map produced by the
Regional Authority for Geology, Commodities, and
Mining of Baden-Württemberg (LGRB), 98
geological classes were reduced to 54 hydrogeological classes and aggregated to eight groups.
FOREST - Percentage of forest [%]
URBAN is an aggregation of settlement
areas and areas with large-scale surface sealing due
to industry. The latter covers 0.8% of the study
area. Settlements are comprised of loose (1.9%) and
dense (4.6%) settlements.
FOREST is a combination of deciduous
(7.8%) and coniferous (21.4%) forest and other
forested areas (10.0%).
Each group was associated with a mean
hydraulic conductivity of the upper hydro-geological
unit. From these values, a weighted mean was
produced for each catchment. From the same data,
the proportion of rock formations with a mean
hydraulic conductivity of less than 10-5 m/s was
derived.
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