Content

Groundwater Levels of the Main Aquifer and Panke Valley Aquifer 2019

Methodology

The groundwater contours of the main aquifer as well as the Panke Valley aquifer were calculated using an interpolation method (Point-Kriging). In order to gain information about the correlation of the spatial distribution and the groundwater level of the measurement points a variogram analysis was performed. For the groundwater level map of May 2018, for the first time, active wells of the Berliner Wasserbetriebe that pump from the main aquifer were taken into account. The status of the wells was set to active based on the recorded pumping volume. The water levels in the wells were derived from the surrounding observation wells.

The geostatistical parameters as a result of the variogram analysis for the main aquifer the Panke Valley aquifer are shown in Tab. 1.

Tab. 1: Input data for the interpolation with the Kriging method
Geostatistical parameter Main aquifer Panke Valley aquifer
ETRS89 easting (min. / max.) 360685.2 / 424199.1 388657.5 / 402242.1
ETRS89 northing (min./max.) 5794825.1 / 5845998.1 5823424,1 / 5837402.5
Spacing about 50 m about 200 m
Number of grid lines x = 1200 / y = 1000 x = 69 / y = 71
Variogram model type linear linear
Slope 0.0011 0.001615
Anisotropy ratio 1 2
Anisotropy angle 128.6°
Kriging type point point
Drift type none none
Interpolation type linear linear
Number of sectors 4
Max. no. of data in all sectors 128
Max. no. of data per sector 24
Min. number of data in search radius 8
Number of max. free sectors 3
Search ellipse, radius R1=10,000 / R2=10,000
Search ellipse, angle 136.7°
Smoothing 3

A program for calculating and plotting surfaces (Software: Surfer 13 by Golden Software Inc.) was used to convert the spatially irregular distributed groundwater and surface water level data into an equidistant data grid with a spacing of approx. 50 m. This was conducted by an interpolation according to the point kriging method. The groundwater contours are shown with the basis of this grid after smoothing with the factor 3.

Especially for the Panke Valley aquifer it was necessary to adjust the geostatistical calculated surface to the hydrogeological situation manually in order to display the effect of the surface water bodies such as the “Panke”, the “Buchholzer Graben” and the “Nordgraben” realistically. Additionally it was crucial to adjust he hydraulic flow conditions of the boundaries of the Panke Valley manually and with a scientific.