1. Research Associate, Dresden Univ. of Applied Sciences, Friedrich-List-Platz 1, 01069 Dresden, Germany.
2. Professor, Dresden Univ. of Applied Sciences, Friedrich-List-Platz 1, 01069 Dresden, Germany (corresponding author).
3. Hydrologist, DREWAG Netz GmbH, Kohlenstr. 23, 01189 Dresden, Germany.