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Berlin Environmental Atlas

02.12 Groundwater Levels of the Main Aquifer and Panke Valley Aquifer (Edition 2009)

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Methodology

The groundwater contours of the main aquifer as well as the Panke Valley aquifers were calculated using an interpolation method (point-kriging). In order to obtain information about the interrelation between the measuring points, concerning their spatial distribution and groundwater level, data were first analyzed by variogram analysis.

The geo-statistical parameters ascertained by variogram analysis for the main groundwater aquifer and the Panke Valley aquifer are listed in Table 1.

Tab. 1: Interpolation inputs for the Kriging method
geo-statistical parameter main aquifer Panke Valley aquifer
Soldner easting (min./max.) -5600 / 56800 22000 / 35000
Soldner northing (min./max.) -3200 / 48000 25000 / 38000
Spacing 400 m 400 m
Number of grid-lines x = 157 / y = 129 x = 34 / y = 34
Variogramm-model linear linear
Slope 0.00109 0.001615
Anisotropic ratio 2 2
Anisotropic angle 141.4° 128.6°
Kriging-Type Point Point
Drift-Typ none none
Interpolation-typ linear linear
Number of sectors 4 no search (use of all data)
Max. number of data in all sectors 128 no search (use of all data)
Max. number of data per sector 32 no search (use of all data)
Min. number of data in the research area 2 no search (use of all data)
Number of max. free sectors 3 no search (use of all data)
Search elipse, radius R1=10000 / R2=5000 no search (use of all data)
Search elipse, angle 141.4° no search (use of all data)
Tab. 1: Interpolation inputs for the Kriging method

The irregularly distributed groundwater and surface measurement data were transformed into an equidistant grid with a spacing of 400 m, with the aid of a program for the calculation and graphic representation of surfaces (Surfer 8.0, by Golden Software). This was accomplished by interpolation according to the Kriging method. The groundwater contours were represented on the basis of this grid, after smoothing.

An groundwater contour map with a grid width of 200 m, updated monthly, has been prepared for internal official use (Hannappel & et al. 2007).

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