The Naka River, Lake Kasumigaura and the Tone River have played an important role in the stable and regional supply of water resources, and have contributed to the industrial and economic development of the basin . However, due to industrial development and urbanization, water blooms have been produced in Lake Kasumigaura since the early 1970s . Various problems such as the occurrence of drought also occur in the Naka River and the Tone River, and efforts are being made to purify the water and secure stable water resources throughout the basin .
The Lake Kasumigaura Water Supply Project started in April 1984  as a solution to these problems by constructing a water network in the Kanto region and effectively utilizing limited water resources . The purpose of the project is threefold: (i) Dilute with clean water and improve the flow to clean Lake Kasumigaura and the Sakura River (Mito City); (ii) Reduce the damage caused by droughts in the Tone River and the Naka River, and preserve the river environment.; (iii) Develop new tap water and industrial water at Lake Kasumigaura and the Naka River .
The total amount of the project was estimated to be 190 billion yen (Approx. USD 800 million at the exchange rate for the dollar in 1984) . The Kasumigaura Water Supply Project consists of the Naka Water Supply Channel connecting the lower reaches of the Naka River and Lake Kasumigaura (from Mito City Watari Chisaki to Tsuchiura Kohoku Town Chisaki, approx. 43 km), and the Tone Water Supply Channel connecting the lower reaches of the Tone River and Lake Kasumigaura (from Inashiki City Kessa Chisaki to Inasaki City Kamisuda Chisaki, approx. 2.6km) and develops two headraces .
The headraces are located in the ground 20 to 50m deep . While the Naka Channel conducts bi-directional transport water from the Naka River to Lake Kasumigaura, from Lake Kasumigaura to the Naka River, the Tone Channel conducts from the Tone River from Lake Kasumigaura, and from Lake Kasumigaura to the Tone River . The following is the details.
Mito Tunnel: It is an underground tunnel from the Naka Pumping Station in Mito City Watari. Town Chisaki to Mito City Kawawada Town Chisaki. Water flows up to 15 m3/s from the Naka River towards Lake Kasumigaura and up to 11 m3 / s from Lake Kasumigaura toward the Naka River. 
Ishioka Tunnel: This is an underground tunnel connecting the 24.7 km from the Mito Water Shaft in Mito City Kawada Town Chisaki to the Takahama Pumping Station in Ishioka City. Mimura Kantaku Chisaki, of the Naka Channel. Water flows up to 15 m3/s from the Naka River towards Lake Kasumigaura and up to 11 m3/s from Lake Kasumigaura toward the Naka River. 
Tone Pumping Station: Three pumps are provided to transport water from the Tone River to Lake Kasumigaura and from Lake Kasumigaura to the Tone River up to 25 m3/s. 
The plan has been changed four times so far , and by March 2018, about 154.5 billion yen (Approx. USD 1.4 billion at the exchange rate for the dollar on 29 March 2018)  was spent on project costs .
In March 1994, the 2.6km-long water supply channel in the Tone River  was completed . However, when the water of Lake Kasumigaura was sent to the Tone River in the trial runoff in September 1995, the mass death of clam occurred in the Tone river .
Due to such circumstances, in March 2009, the Naka River Water System Five Fishery Cooperatives became the plaintiffs and filed a water court case in the Mito District Court against the country . The reason was that the water transfer project destroys the biological communities unique access to each water system by exchanging specific species of different water systems with the movement of water . In October 2009, the Democratic Party underwent a review of this project and it was frozen . However, in March of the following year, the water intake construction (land section) was completed, and in August 2014, the Ministry of Land, Infrastructure, Transport and Tourism decided on project continuity in the review of the dam project . As a result, it affects the life, industry, and culture that are built on the basis of each biological community and ecosystem and destroys them . Although the fishermen's side submitted to the Mito District Court about 13,000 signatures in March 2015 asking for an injunction, the district court's decision rejected the petitioner's request . Therefore, the fishing co-op appealed within the month. While in January 2016, the Tokyo High Court held the first appeal of the appellate hearing, around March of the same year, the Ministry extended the project period to 2023 . The high court began to ask the fishermen for a settlement under the water from around July of the following year, and after half a year the high court issued a settlement recommendation by oral argument, and the settlement talks began . The high court presented a settlement proposal in March of the same year, asking both the government and fishermen for an answer until April 25 . As a result, the settlement was reached on April 27 . In the settlement proposal, it was stated that the purpose of the project was to consider the impact on the fishery in conducting the business and to respect the opinion of each fishermen's cooperative . Furthermore, they asked for a place to exchange views with the fishermen's side until the facilities were put into full operation in order to prevent adverse effects on eight types of fishery resources such as sweetfish, salmon, and clams . In addition, they asked that the government carry out a project by limiting water intake until the full operation, conducted a small amount of test water supply to the country, and regularly conducted monitoring surveys such as water quality .
As of the end of November 2018, three of the planned pumping stations have been completed, and 11 of the 12 planned waterway shafts have been completed, and approx. 14.2km out of about 43km the Naka Water Supply Channel of the waterway has been completed, and full of the Tone Water Supply Channel has been complete .