Note on Design Parameters and Performance of a Gravitation Vortex Water Turbine (GVWT) with Zotloterer Turbine

Abstract

Micro-hydro power is a critical component of decentralized renewable energy systems, particularly in remote regions with low-head, low-flow water resources. Traditional large-scale turbine designs (e.g., Francis, Kaplan) are often inefficient, costly, or environmentally inappropriate for these conditions. The Gravitation Vortex Water Turbine (GVWT), exemplified by the Zotloterer design, emerged as a promising alternative. It harnesses energy from a gravity-driven, free-surface vortex within a cylindrical tank, offering a simple, robust, and environmentally friendly—often "fish-friendly"—solution. In the present article, we discuss among other things, aspects of design parameters and performance of GWVTT along with Zotloterer Turbine.