One or more water demand patterns? - Calibration of the selected water network model Beata Kowalska, Dariusz Kowalski, Paweł Suchorab and Małgorzata Iwanek E3S Web Conf., 59 (2018) 00020 Published online: 16 October 2018 DOI: 10.1051/e3sconf/20185900020