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laboratory, applying stone riprap with the diameter greater than 0,4 meters for downstream protection using U-shape pattern (See Figure 10). Fig. 10. Stone riprap for downstream protection (Scenario 2) Various discharges applied to see the impact of the local scouring. According to the simulation results, there is a decline of maximum scouring depth from -3 meters in Scenario 1 to -1,5 meter in Scenario 2 as can be seen in Figure 11. This outcome shows that stone riprap protection is effective to use to reduce the impact of the scouring. Fig. 11. Scouring condition at downstream of spillway (Scenario 2) 695