BANGKOK, Sept. 13 (Xinhua) -- The Bangkok Metropolitan Administration (BMA) on Tuesday issued a warning of moderate to heavy rain and potential floods from 4 p.m. to 11 p.m local time in the Thai capital's 12 districts.

This came after several parts of the city had been inundated after heavy monsoon rains in the last several days.

The main reason for the flooding is more rainfall than usual in and around Bangkok this year, which has swollen rivers and caused flooding in the city, Bangkok Governor Chadchart Sittipunt said Monday at a briefing on the city's flood situation.

This year has been the wettest in recent years, but the overall situation in Bangkok is improving, Chadchart added.

According to the Royal Irrigation Department, the average daily rainfall in Bangkok during the first 10 days of September was 96.5 mm, compared to an average of 52.2 mm in the same period last year. On Sept. 10, the 24-hour rainfall was 112.7 mm, the highest record in six years.

Currently, the BMA is prepared to deal with the possible flash floods with dredging 32 waterways and upgrading drainage stations.

The authorities will take a series of emergency response measures in case of extensive flooding, including setting up temporary shelters and arranging relief supplies.