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In Indonesia, the common problem in operating breastshot water wheels is wheel operation discontinuity due to low stream velocity in the channel during the dry season. One could minimize this problem by studying the method of maintaining the wheel's operation continuity during the season. Therefore, this study aimed to propose the installation of a water-jumper at the wheel upstream by fabricating water channel laboratory models and a breastshot water wheel. The water-jumper, whose slope angle is adjustable, is attached at the upstream. The study also aimed to investigate the effect of the waterjumper slope on the breastshot wheel's performance. The slope angles were set at 5°, 10°, 15°, 20°, 25°, 30°, 35°, and 40°, and the upstream velocities were 1.1, 1.2, 1.3, 1.4, 1.5, and 1.6 m/s. The result showed that the water-jumper could increase the low stream's gross head and hydraulic power, enhancing the breastshot wheel's torque and output power. The highest efficiency is achieved at the slope of 10° for a stream velocity of 1.3 m/s. Furthermore, the water-jumper significantly affects a stream velocity lower than 1.3 m/s. The hydraulic power is influenced by discharge and gross head, which increase with the waterjumper slope angle. However, higher momentum losses occur at the wheel for stream velocity higher than 1.3 m/s, decreasing the breastshot output power and efficiency while increasing hydraulic power. Overall, the water-jumper could maintain continuous breastshot wheel operation in the irrigation channel during the dry season. [ABSTRACT FROM AUTHOR]