56-57 years Okinawa shortage of water of the Showa era
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Okinawa shortage of water (しょうわ 56-57 does not lie down I get up, and a rope is not crowded) is a shortage of water that lasted 1,981 years (1982) (1981) in Okinawa until June in 1982, the following day from July for 56-57 years of the Showa era. Precipitation dropped two-thirds of the average year, the river quantity of water to a one-third of the average year, and water supply restrictions by the designated suspension of water supply were carried out at time for 326 days. This is the water supply limit days that are the longest in Japanese city waterworks.
Table of contents
Process
Nine years passed from Okinawa return, and economic growth and the spread of waterworks advanced, and water demand was increasing in those days. 3 dams (瑞慶山 dam, Tengan dam Kin Dam) of the Okinawa management and Fukuchi dam of the country (the Okinawa General Bureau, Cabinet Office) management in the northern part of Okinawa Island were used as a water source of waterworks, but shortage of water became chronic, and water supply restrictions were repeated almost every year. 169-day water supply restrictions are carried out in (1977) in 1977 in particular. Therefore, in the Fukuchi dam, dam redevelopment business by the padding was launched, and the construction of five dams (Benoki dam, feather place dam, 普久川 dam, Kanna dam, Aha dam) was begun newly in the northern part of Okinawa Island.
In (1981), a precipitation of the time did not lay half of the average year as follows in the rainy season in 1981, and the pondage of each dam continued decreasing because consumption of the water increased with a rise in temperature. Okinawa shortage of water task force meeting is held at the end of June on July 1 because the pondage total of the prefecture management 3 dam was as follows in less than 60% in the water, Fukuchi dam 80%; except the small portion northern on after July 11 in Okinawa Island approximately in the whole area from 20:00 on the next morning until 6:00 suspension of water supply began by night.
Shortage of water
Suspension of water supply was carried out by night every other day from July 16 because a storing water rate of the prefecture management 3 dam dropped to 28.2% on July 13 without it raining after a suspension of water supply start. Every other day suspension of water supply is to divide Okinawa Island in two areas, and to repeat water supply and suspension of water supply by turns by each area 24 hours. It became the suspension of water supply again by night temporarily every other day from August 24 of the thing which returned to suspension of water supply from July 22. Typhoon 18th passed it on Saikai of Okinawa Island from August 30 through 31st and brought damage caused by the wind, but, as for the rain as I was expected, shortage of water worsened without falling.
There was not the effect of the thing which a trial of the artificial rain by the sprinkling from Self-Defense Forces plane P-2J was carried out for over Fukuchi dam on October 18, and a storing water rate of the prefecture management 3 dam has almost dried up with 5.1% on October 20. Typhoon 24th passed on Tokai of Okinawa Island on October 21 and brought well-organized rain, but the water level recovery was insufficient, and the water supply limit was continued. For such situation, 5,000 polycontainers are given as relief supplies from Fukuoka-shi that experienced a shortage of water in (1978) in 1978. It was special, and water supply restrictions were canceled during the year-end and New Year periods from December 30 to January 3.
New year began, and water supply restrictions were reopened (1982) from January 4 in 1982, and only the rain of around 5 millimeters of the thing that a trial of the artificial rain using the dry ice was performed on January 14 was provided. Because rain was not able to anticipate even a weather cast so as that to continue withdrawing, and the water level of the Fukuchi dam which was the rope of the request was included in February, and a storing water rate broke 40%, water supply time was reduced more for four hours from February 15, and it was 20 ration water every other day. Completed the dam under construction by rush work 1 months before the plan, and, in the 普久川 dam, the Aha dam started storing water from March 1 on February 22, and the water supply to the Fukuchi dam was enabled in those days. The Fukuchi dam records 32.4% of lowest storing water rates on March 21.
Recovery
Large amount of rain fell in the northern part of Okinawa Island on March 27, and it was relieved every other day from April 12 to suspension of water supply because rain continued afterwards. There is the well-organized rain again on May 3, and it is relaxed by night from May 8 to suspension of water supply. It was rainfall eagerly longed for for the shortage of water of the thing which there was torrential rain on May 28 and June 2, and a flood produced in each place. Because a storing water rate of the prefecture management 3 dam restored the Fukuchi dam than 70% more than 90%, and it was if 普久川 dam and the Aha dam were in state that they were approximately filled with water, all water supply limits were canceled on June 7.
The post
The water supply restrictions that it is up to approximately two month are performed afterwards in Okinawa in (1993) in (1991), 1993 in (1989), 1991 in (1988), 1989 in 1988. However, the dam under construction was completed sequentially, and the shortage of water was gradually relaxed by the redevelopment of Fukuchi dam and the 瑞慶山 dam because pondage increased. On the other hand, a big water tank came to be installed in many houses in Okinawa on the roof by experience of repeated shortage of water.
References
Allied item
This article is taken from the Japanese Wikipedia 56-57 years Okinawa shortage of water of the Showa era
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