A number of researchers have studied the scour phenomenon in non-cohesive soils. Several of these studies are empirical due to the complexity of the physical processes involved. The physical model presented in this paper consists of an impinging jet released from a ski jump with a takeoff angle of 35°. The jet impacts on a scouring plunging pool made up of non-cohesive soil. The area of the physical model was 10.0 m. long and 5.0 m wide. The maximum scour depth (hs) in the impingement zone is estimated using different parameters such as H: difference between water level at the reservoir and the tailwater level, θi: the angle of attack (measured from the x-axis) that the jet forms when impacting the plunging pool, q: the discharge per unit area (0.033, 0.0667 and 0.1 m2/s), d50 and d85: the representative sediment diameter used in the tests (coarse sand: d50 = 1.60 mm, d85 = 4.81 mm, medium gravel: d50 = 17.88 mm, d85 = 23.43 mm, and rounded cobbles: d50 = 49.08 mm, d85 = 70.53 mm) and htw: tailwater depth: 0.05m, 0.10m, 0.25m and 0.50m. A dimensional analysis (Pi-Buckingham theorem) and linear multiple regressions are performed to obtain a mathematical equation that predicts the final depth of scour. During the tests, it was evident that a tailwater practical limit exists for which scour does not occur. The need of additional tests is assessed. Copyright ASCE 2005.