2023-11-21 03:48:31
Rainfall in western Japan for 60 days is less than 30% of the normal level, water storage rate is zero at Kano River Dam, and water intake restrictions are also in place (Weather Forecaster, Chief Nikki, November 21, 2023) – Japan Weather Association tenki.jp
Precipitation in western Japan for 60 days is less than 30% of normal water storage rate at Kano River Dam is zero, water withdrawal restrictions also in place
November 21, 2023 12:48
The total precipitation for the 60 days up to November 20th, mainly in western Japan, is lower than normal, and in some places it is less than 30% of normal. The water storage rate at the Kanogawa Dam in Ehime Prefecture has dropped to zero. Water intake restrictions are in place at six major dams in the Takahashi River system in Okayama Prefecture and the Hiyoshi Dam in Kyoto Prefecture. In the future, rainfall is expected to be lower than normal in western Japan, mainly on the Pacific side, and there are concerns that the water storage rate of dams will decline.
Low precipitation and limited water intake
The figure above compares the total precipitation for 60 days from September 22nd to November 20th with the normal year.
There are many places on the Pacific side of Tohoku, the Kanto region, Kyushu, and Okinawa that are experiencing lower than normal weather. Particularly in the Chugoku region, Shikoku, Kyushu, and Okinawa, there are areas where the average level is less than 30% of the normal level, which is shown in brown. The 60-day rainfall was 49.5 mm in Kurashiki City, Okayama Prefecture, 28% of normal, 53.0 mm in Matsuyama City, Ehime Prefecture, 25% of normal, 52.5 mm in Usuki City, Oita Prefecture, 17% of normal, and Ishigaki City, Okinawa Prefecture. In Ibaruma, it was 88.0 mm, 22% of normal, and less than 30%.
According to an announcement by the Shikoku Development Bureau of the Ministry of Land, Infrastructure, Transport and Tourism, as of midnight on November 21st, the Kanogawa Dam in the Hijigawa River system in Ehime Prefecture had a water storage rate of zero. Even in Ozu City, Ehime Prefecture, where the Kanogawa Dam is located, rainfall over 60 days was 90.0 mm, which is 37% less than normal. In addition, water withdrawal restrictions are in place in several places in western Japan, including the three Dozan River dams in Ehime Prefecture, six major dams in the Takahashi River system in Okayama Prefecture, and the Hiyoshi Dam in Kyoto Prefecture. In addition, the standard water level of Lake Biwa on November 21st was -61 cm, which is lower than the average water level from 1992 to Reiwa 4.
Reasons for low precipitation
One possible reason for the decrease in precipitation this fall is the lack of typhoons. The number of typhoons this year is lower than normal: 2 in September, 2 in October, and 0 in November (until the 20th). The number of approaching Japan was also lower than normal, with 3 in September, 1 in October, and 0 in November (until the 20th).
Another possible reason for the decrease in precipitation is that the autumn rain front was not very active.
Precipitation is expected to continue to be low
According to the one-month forecast released on November 16th, precipitation through December 17th is expected to be below normal on the Pacific side of eastern and western Japan, Okinawa and Amami, and below normal on the Sea of Japan side of western Japan. There are concerns that the dam’s water storage rate will continue to decline. Let’s try to use limited water resources carefully.
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