Reliable water storage is an essential component of water-supply infrastructure, particularly where continuity of supply is required during periods of peak demand or intermittent production. This paper presents the structural analysis and design of an 80 m³ elevated reinforced concrete water reservoir with a nominal staging height of 10 m. The proposed tank is rectangular in plan, measuring 6.7 m × 4.0 m, with a 3.0 m water depth and a 0.5 m freeboard, giving an overall tank height of 3.5 m. The structural assessment considers hydrostatic pressure, self-weight, gravity loads, wind action and the effects of these actions on the tank walls, base slab, roof slab, beams, columns, bracing members and foundations. The design approach follows the limit-state philosophy of the Eurocodes, with EN 1992-3 used for the liquid-retaining components and EN 1992-1-1 used for the supporting reinforced-concrete staging and other structural members. Particular attention is given to serviceability, crack control, deflection, durability and reinforcement detailing because an elevated water tank must satisfy both structural strength and liquid-tightness requirements. The design indicates 300 mm tank walls, a 350 mm base slab, 200 mm roof slab, reinforced concrete beams and 400 mm-class columns, with a 2.0 m × 2.0 m isolated footing adopted for the critical support. The results indicate that the proposed structural system can satisfy the stated design objectives under the assumptions adopted. However, the final construction design should be verified against project-specific geotechnical data, wind parameters, seismic requirements, material certificates and the approved structural drawings.

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