Manno Lake


Mannō Lake is a man-made irrigation reservoir with a reserve capacity of 15.4 million tons, located in the town of Mannō, Kagawa, Japan, on the island of Shikoku. It is vaguely shaped like a human hand. Around the lake is a forest of Japanese red pine, sawtooth oak, and konara oak, and 75 species of birds, including goshawks and sparrowhawks, as well as 12 species of wild animals, including Japanese squirrels. Due to the importance of the habitat, Kagawa Prefecture has designated 321 hectares as a wildlife sanctuary.

History

;701-704 : Michimori Ason, the lord of Sanuki Province, erects the first dam. It was originally called Kaminoike because it was located in Kaminogo, but in the early Heian period, when Emperor Saga ascended the throne, it was changed to Manoike because prior to ascending the throne the emperor's name was Imperial Prince Kamino.
;818 : Mannō Pond dam ruptures due to flooding.
;821 : Kukai is dispatched to oversee renovations of Mannō Pond dam, with construction being completed in approximately 3 months. Between the years of 821 and 1184, the Manno Pond dam collapses and is subsequently restored many times.
;1184 : After the collapse of the dam in 1184, all rebuilding efforts were abandoned until 1628. During this period, people settled in the basin constructing houses and cultivating fields. The settlement was named Ikeato Mura.
;1628 : By order of Takamatsu Domain daimyō Ikoma Takatoshi the fushin-bugyō Nichijima Hachibe’e begins renovations of the Mannō Pond dam.
;1631 : Takamatsu Domain completes renovations of the dam.
;1854 : Dam collapses due to earthquake.
;1870 : Restoration of dam completed. Afterward restorations, the three separate constructions of the Tenkawa headrace began, in order to supplement water intake from the Dokigawa, resulting in an increase of water volume three times.
;1996 : Mannō Pond selected as one of the 100 Soundscapes of Japan by the Ministry of the Environment.
;2000 : Mannō Pond Conduit Gates registered as Japanese cultural landmark-.
;2005: Mannō Pond dam receives the Dammed Lake Hyakusen certification from the Dam Watershed Environmental Improvement Center.
;2010: Mannō Pond receives the Pond Hyakusen certification from the Japanese Ministry of Agriculture, Forestry, and Fisheries.
;2018: Mannō Pond designed a nationally designated Place of Scenic Beauty,

Data

;Current data
;Data from 821
;Data from 1631
;Data from various embankment constructions

Yuru-Nuki

A "Yuru" is a water reservoir plug. Yuru-Nuki ceremony, which is held on annually on June 15 at Manno Pond, releases water to irrigate fields for the rice-planting season.

Access

;Car
;Railway
;Airplane