In Malaysia, 20% of dams have started to exhibit recurrent maintenance issues. This paper reports the impacts of different particles properties on a small-scale spillway using Discrete Particle Method (DPM). An ogee dam spillway model was developed and scaled down to 1:40 size to re-enact the particles movement and pattern. The particles used in this study were 0.06 mm sand, 0.015 mm sand, and 0.03 mm acrylic. The study was done to check the durability of structure by identifying the area that experienced high velocity. The velocities were then validated with the velocities obtained from physical model using Particle Image Velocimetry (PIV) method. The results obtained from both methods were different by less than 10% hence they are acceptable. The pressure at the highest velocities area was compared with the concrete yield strength. The study proved that the area that experience highest velocity and pressure is at Study Sect. 2 with 2.622 m/s and 2.30291 Pa respectively. The correlation of velocity and pressure is not directly proportional might be due to flow disturbed by energy dissipater and occurrence of hydraulic jump. As the pressure is lower than compressive strength of the structure, therefore, the dam structure is still durable. The future researcher could continue the study by comparing the results obtained with Inception Cavity Index to further study the relationship between pressure and cavitation of dam structure.