<p>A comprehensive appreciative of hydrodynamic pressure performance is critical for the structural protection and optimal design of overhead water tanks. The failure mechanisms of these structures can be significantly affected by their dynamic response, particularly due to the movement and formation of impressions on the water free surface, as well as the sloshing effect. This study employs scaled-down models of rectangular elevated water tanks of different aspect ratio, utilizing shaking table experiments to simulate seismic behaviour and investigate the resulting hydrodynamic pressure distribution and sloshing wave height. Given the impracticality of testing full-scale prototypes, scaled models serve as an effective alternative for such dynamic analysis. To accurately capture the tank's response, the study integrates pressure sensors and accelerometers, providing precise measurements of both hydrodynamic pressures and acceleration response. The experimental results indicate that there is steepest increase in impulsive pressure and shows a trend where the pressure of hydrodynamic near the top of the tank slightly decreases as the aspect ratio increases. The system with low aspect ratio showed uniform pressure distribution yet models with high aspect ratios demonstrated the most drastic convective pressure rise. The impulsive and convective pressure variation obtained experimentally through the lenght of tank shows the non-linear trend. This dynamic behaviour is distinct when compared to linear distribution of pressure in static loading.</p>