“…Variability of discharge is not only an important indicator of aquifer structure (Diodato et al, 2017;Fiorillo and Guadagno, 2012) or a determinant of habitat conditions (Dumnicka et al, 2012), but also a marker of climatic trends (Fiorillo et al, 2015;Guo et al, 2005;Hao et al, 2015) or human impact on groundwater environment (Liu et al, 2017). Variability of discharge in selected springs of mountain and highland areas of Poland was investigated by Barczyk et al (1999), Jokiel (1994Jokiel ( , 1997, Barczyk (2003), Humnicki (2006Humnicki ( , 2012Humnicki ( , 2015, Satora et al (2010), Moniewski (2015Moniewski ( , 2016, Michalczyk et al (2015) and in multi-year periods by Michalczyk et al (2008), Michalczyk and Chabudziński (2013), Siwek (2013) as well as Siwek and Pociask-Karteczka (2017). However, not many reports have been published in this field, as accurate examination of spring discharge variability requires relatively long series of measurements with at least monthly data resolution.…”