Mayor Kazumi Matsui confessed regret over the advisory's late issuance and recommended that the city study the incident to improve the process.

Under the law which took effect in 2001, prefectural governments and other authorities must carry out on-site research to designate areas for which evacuation plans and hazard maps will be created.

Within this area, landslides and debris flows occurred behind the Abu-no-Sato housing complex, Mitsuhiro Shine, and Midorigaoka prefectural apartments.

[2] After 10 days from the event, large amounts of water was found near the source of this flow, resulting in muddy conditions.

[2]The main triggering cause for the event was the highly intense, short duration rain that occurred in the area.

[2] Due to the warm, moist air from the Akisame front which passed over the western Shugoku Mountains, cumulonimbus clouds began to develop in the northwest of Hiroshima City.

[2][3] Following the torrential rain, in which over 200mm of cumulative rainfall fell,[2] several landslides were triggered near a mountain beside the city of Hiroshima.

This significant volume of rain hit the surface, resulting in constrained groundwater in the water-bearing layer and a development of a head.

[2] The deposits were also rich in fine granite soil particles which can decrease the permeability of the flow and cause greater mobility.

[22] Japanese Prime Minister Shinzo Abe directed the military to deploy hundreds of personnel to assist the local rescue teams.

[4] Japanese Red Cross[23] and the NPO Peace Winds Japan[24] also sent staff, and an estimated 1,300 people have volunteered.

[26] An estimated 2,000[27]–3,600[28] rescuers consisting of firefighters, police and members of the Self-Defense Force took part in searching and clearing debris despite rain and dangerous conditions that hampered and sometimes halted their efforts.

[32] Evacuation advisories were partially lifted for Asaminami-ku on Sunday, 31 August, allowing about 14,400 persons (around 5700 households) to return to their homes.

[55] The Emperor and Empress visited Hiroshima 3 December, and observed damage and met survivors, SDF personnel, firefighters, police and volunteers.

)[57] Hiroshima prefectural and municipal governments decided to provide 157 public housing units, for evacuees, free of charge.

[59] According to the city, municipal housing is provided rent-free for up to a maximum six-month stay, as a general rule.

[60] On 2 September, officials issued a new evacuation advisory to parts of Asaminami-ku, fearing that a nearby slope might collapse and cause more damage.