1. Assistant Professor, Dept. of Piped Utility Systems, Kielce Univ. of Technology, Faculty of Environmental, Geomatic and Energy Engineering, 25-432, Kielce, Poland (corresponding author).
2. Professor, Dept. of Piped Utility Systems, Kielce Univ. of Technology, Faculty of Environmental, Geomatic and Energy Engineering, 25-432, Kielce, Poland.
3. Assistant Professor, Dept. of Environmental Engineering and Pollution Control, Kielce Univ. of Technology, Faculty of Environmental, Geomatic and Energy Engineering, 25-432, Kielce, Poland.