1. Faculty of Agricultural and Environmental Science, Soil Science Univ. of Rostock Justus‐von‐Liebig‐Weg 6 Rostock 18051 Germany
2. School of Architecture and Civil Engineering, Institute of Foundation Engineering, Water‐ and Waste‐Management, Lab. of Soil‐ and Groundwater‐Management Univ. of Wuppertal Pauluskirchstraße 7 Wuppertal 42285 Germany
3. Faculty of Agriculture, Dep. of Soil and Water Sciences Univ. of Kafrelsheikh Kafr El‐Sheikh 33516 Egypt
4. Dep. of Environment, Energy and Geoinformatics Univ. of Sejong 98 Gunja‐Dong Guangjin‐Gu Seoul Republic of Korea