Table 2 Comparison of sediment discharge and production triggered by the heavy rainfall events in 1990, 2001, and 2012 (after Miyabuchi and Daimaru, 2004 and Saito et al. 2016), and the 2016 Kumamoto earthquake. The rainfalls and return periods were calculated from radar/rain-gauge analyzed precipitation provided by the Japan Meteorological Agency (Saito and Matsuyama, 2015)
Event | July 1990 | June 2001 | July 2012 | 2016 Kumamoto earthquake |
|---|---|---|---|---|
Max. 1 h rainfall/return period | 80.0 mm/12 years | 90.0 mm/23 years | 85.0 mm/16 years | 0.0 mm |
Max. 24 h rainfall/return period | 497.8 mm/26 years | 297.0 mm/2 years | 427.6 mm/11 years | 0.0 mm |
Sediment discharge (sediment production, m3/km2) | 3.1–3.9 × 104 | 3.0–4.1 × 103 | 1.2–4.8 × 105 | 2.5 × 104 |