# Hydrostatic pressure wheel in water distribution systems

## TL;DR

This paper introduces a new waterwheel system that improves irrigation control and generates renewable energy, outperforming existing technologies.

## Contribution

The paper introduces a variable-speed hydrostatic pressure wheel with a novel coupled numerical framework for optimizing energy and hydraulic control.

## Key findings

- Variable-speed HPW operation achieves 45% efficiency and 3.5 kW power output with water level deviations below 2.7%.
- Variable-speed HPWs outperform fixed-speed systems by up to 25% in energy yield and 60% in regulation precision.
- The HPW converts wasteful energy into renewable power while improving irrigation management.

## Abstract

This study presents a transformative advancement in water-energy nexus management by developing a hydrostatic pressure wheel (HPW) system that simultaneously optimizes water level regulation and hydropower generation in open-channel irrigation systems (OCISs)—a dual functionality not achieved by existing technologies. While conventional waterwheels focus solely on energy production, our HPW design leverages hydrostatic pressure dominance to provide precise hydraulic control while extracting renewable energy, addressing two critical needs in irrigation infrastructure with a single integrated solution. The research introduces key innovations beyond current literature: (1) a variable-speed HPW operation strategy that dynamically adjusts to flow conditions, achieving superior performance (45% efficiency, 3.5 kW power output) while maintaining water level deviations below 2.7%—a 40–50% improvement in control accuracy compared to fixed-speed systems and (2) the first coupled numerical framework integrating OCIS hydraulics with HPW dynamics and multi-objective optimization (NSGA-II) to resolve the inherent trade-off between energy maximization and hydraulic stability. The results revealed that variable-speed operation considerably outperforms conventional fixed-speed designs in both energy yield and regulation precision with respectively up to 25% and 60% improvement. These advancements establish HPWs as a new class of smart hydraulic structures that convert traditionally wasteful energy dissipation into renewable power generation while enhancing irrigation management—a capability absent in all prior waterwheel applications documented in literature.