The Vertical Arcology Hydraulic Spine (VAHS): A Theoretical Energy Architecture for Closed-Loop Megastructure Integration

This paper introduces the Vertical Arcology Hydraulic Spine (VAHS), a novel theoretical energy architecture in which the vertical height of a megastructure functions simultaneously as inhabited space, hydraulic generation head, gravity battery, municipal water infrastructure, and atmospheric water harvesting system. Applying the standard hydraulic power equation (P = ρgQhη) to head heights of 500 to 2,000 meters using Pelton wheel efficiency of 0.90, we demonstrate that modest flow rates produce utility-scale power outputs comparable to major hydroelectric installations. At 2,000 meters head and 100 cubic meters per second, theoretical output reaches 1,766 MW — rivaling the Robert Moses Niagara Power Plant using less than five percent of its flow volume. The Bieudron Power Station in Switzerland, currently operating at a world-record 1,883 meters head, confirms that the required turbine physics are fully operational at these pressure ranges. The VAHS extends the recently proposed SOM-Energy Vault EVc building-integrated pumped storage concept by introducing atmospheric water harvesting at sky-tier elevation as the primary water source. This introduces free solar-cycle potential energy into the system and fundamentally alters the thermodynamic accounting from pure storage to conditional net generation. The dual-use water-energy accounting framework developed here — in which pumping costs are amortized across both water supply and energy storage functions — does not exist in the current peer-reviewed literature. A complete power output calculation table is provided across head heights of 100 to 2,000 meters and flow rates of 0.1 to 100 cubic meters per second, with comparison rows for Hoover Dam, Robert Moses Niagara, Three Gorges Dam, and Bieudron PSH. Structural engineering implications are analyzed including hydrostatic pressure at base (19.62 MPa at 2,000m), water hammer management through multi-tier cascade architecture, and material requirements based on Alpine hydroelectric and deep mine engineering precedents. Planetary-scale hydraulic considerations are reviewed including the Three Gorges rotational inertia literature and the distributed versus concentrated extraction debate. The paper presents a structured research agenda for the engineering and energy science communities covering computational fluid dynamics modeling of internal penstock systems, thermodynamic lifecycle analysis of the atmospheric harvest integration, structural resonance analysis, and scaled prototype validation. This preprint is part of the Presignal Research Initiative portfolio and is submitted as a theoretical framework for development by the broader engineering research community. This work is associated with the Resonance City civilizational continuity architecture framework and the Global Geostability Index preprint series currently in development under Presignal Inc.