This share presents raw data and Python source code for signal processing in overflow velocity measurement using millimeter-wave MIMO-FMCW radar on a fabricated real-scale pseudo embankment. The dataset and code offer insights into developing robust river embankments, crucial for mitigating failures during heavy rains in Japan. The methodology involves constructing a pseudo embankment recommended by the Ministry of Land, Infrastructure, Transport, and Tourism (MLIT) for technology validation.