This article is a critique on the paper <q>Spatial characterization of long-term hydrological change in the Arkavathy watershed adjacent to Bangalore, India</q>, by Penny et al. (2018), published in the journal of Hydrology and Earth System Sciences (volume 22, issue number 1). Penny et al. (2018) have applied a methodology for analysing long-term hydrological changes by treating a <q>gauged watershed</q> as a <q>un-gauged</q> one. The arguments presented in this article highlights choice of inappropriate methodology (for a watershed which is actually gauged) and faulty assumptions by Penny et al. (2018) for analysing the watershed scale hydrological changes, generating misleading results and inferences.