Input (grade 11): Heavy rainfall on August 7 and 8, 1708, the year following the HÅ ei eruption, caused an avalanche of volcanic ash and mud and broke the dams, flooding the Ashigara plain.
Output (grade 4): Heavy rainfall on August 7 and 8, 1708, caused an avalanche of volcanic ash and mud and broke the dams. The river flooded the Ashigara plain.