It should be mentioned that for the flow depth, measurements on the physical model at 10 cross-sections and perpendicular to the steps invert were made. The average velocity in the laboratory was measured by pitot tube and the pressure by piezometers which were installed on the steps. Table 1 shows the geometric and hydraulic characteristics of the Zirdan Dam spillway.
Geometric and hydraulic characteristics of the stepped spillway of Zirdan Dam
| Design spillway discharge | 760 |
| Width of the spillway (m) | 55 |
| Number of steps | 64 |
| Spillway slope (degrees) | 50.19 |
| Volume of the dam reservoir (m3) | 207 × 106 |
| Dam height (m) | 65 |
| Design spillway discharge | 760 |
| Width of the spillway (m) | 55 |
| Number of steps | 64 |
| Spillway slope (degrees) | 50.19 |
| Volume of the dam reservoir (m3) | 207 × 106 |
| Dam height (m) | 65 |