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Compared with general trapeziform plunge pools, an arciform plunge pool has its advantages, e.g. Less excavate quantity, higher stability, etc. In this paper, the hy-drodynamic pressure distribution on the soleplate of the arci-form plunge pool is measured under a relatively dangerous condition of operation. The result is helpful to the design of the arciform plunge pool. The result also shows that the difference between the maximum and the minimum pressures on the upward surface of the soleplate may cause an additional uplift force on the soleplate under certain condition and should be taken into consideration in the uplift force calculation of the soleplate. The scour experiment verifies the higher stability of the arciform plunge pool.