Yoichi Hatta: From Hydraulic Legend to the "Biting Canal," the Colonial Imprint of a Technocrat

30-second overview: In 1920, Japanese engineer Yoichi Hatta directed the construction of the Wushantou Reservoir and the Chianan Canal on Taiwan's Chianan Plain. This hydraulic project, celebrated as an "engineering miracle," transformed barren land into Taiwan's rice granary. Yet behind it lay the Japanese colonial government's extraction of Taiwanese resources, as well as the hardship and suffering of farmers forced into a "three-year crop rotation system"; some even called it the "biting canal." Hatta's decision during layoffs to "dismiss outstanding employees first" has been interpreted as humanitarian concern, but it also provoked management controversy. This history, from the postwar despair and drowning suicide of Hatta's wife, Sotoki, to the contemporary beheading of his bronze statue, continually reminds us that the evaluation of a colonial builder's achievements and faults is never one-dimensional, but full of contradiction and tension.

A Vision Across Eras: The Birth of the Chianan Canal and Its Colonial Context

In 1910, after graduating at age 24 from the Department of Civil Engineering at Tokyo Imperial University, Yoichi Hatta came to serve in the Civil Engineering Bureau of the Taiwan Governor-General's Office. At the time, the Chianan Plain was a vast expanse of rain-fed farmland afflicted by both drought and flooding, and farmers struggled to make a living. After conducting in-depth surveys, Hatta proposed a bold plan: to build a large reservoir and divert water to irrigate this land, which extended across 150,000 hectares¹.

At the time, this plan was regarded as a "dream" because its enormous scale and technical complexity were unprecedented. Yet drawing on his professional knowledge and tenacity, Hatta overcame numerous difficulties. On September 1, 1920, construction of the Chianan Canal officially began. The project took ten years, cost 54 million yen, mobilized countless workers, and was finally completed and opened to water flow on April 10, 1930². The project not only expanded the area of paddy fields from about 5,000 hectares to 150,000 hectares and increased agricultural output by two to five times, laying the foundation for Taiwan's rice granary³; because of its technical innovation, the "semi-hydraulic fill earth dam" method used at Wushantou Reservoir was specially named the "Hatta Dam" by the American Society of Civil Engineers (ASCE) and introduced in its journal⁴.

📝 Curator's note: The construction of the Chianan Canal was both a triumph of technology and a microcosm of resource redistribution under colonial rule. It brought abundant harvests, but also changed farmers' ways of life and even generated profound social contradictions. The project served Japan's colonial strategy of "agricultural Taiwan, industrial Japan"; its grand achievements cannot be separated from the imperial purposes behind them.

Wushantou Reservoir: Sacrifice and Management Style Beneath an Engineering Miracle

The core of the Chianan Canal was the Wushantou Reservoir, which adopted the advanced "semi-fill dam" construction method of the time and was one of the few such cases in the world⁵. The reservoir's design made ingenious use of the terrain, diverting water from the upper reaches of the Zengwen River to form the broad "Coral Lake." The reservoir endured tests such as the August 7 Floods and the 921 earthquake, remains stable in operation today, and supplies water for agriculture, industry, commerce, and technology, demonstrating century-long durability⁶.

Yet this great project was also accompanied by enormous sacrifice. According to records, around 134 people died during the construction period⁷. In the early stage of tunnel excavation, because workers lacked pre-employment training and petroleum gas had not been dealt with, a major explosion occurred, killing about 50 workers. In this incident, Hatta was criticized for failing to reflect on his own responsibility and instead severely scolding the workers, highlighting the fragility of labor rights under the colonial system⁸. In addition, not long after the reservoir was completed, in December 1930, it was damaged across 360 feet by a moderate earthquake. Some criticism pointed to problems in geological investigation and design, as well as Hatta's obstinacy in refusing American experts' recommendations for the sake of "face"⁹.

During the construction period, Hatta's management philosophy was also full of contradictions. He insisted on building a complete employee residential area at Wushantou, providing schools, hospitals, public baths, recreational facilities, and other amenities regardless of whether employees were Taiwanese or Japanese, in an effort to improve employees' quality of life¹⁰. However, when funding cuts caused by the 1923 Great Kanto Earthquake forced layoffs, Hatta chose to dismiss "outstanding employees" first. He believed: "Outstanding personnel can easily find new jobs; by contrast, once people of mediocre ability are dismissed, their entire family immediately falls into hardship."¹¹ Although this action has been positively interpreted as humanitarian concern, critics argue that in a large engineering project, "eliminating the strong and retaining the weak" could affect construction quality and safety, causing lower-ranking Taiwanese workers to suffer under poorer leadership. There are occasional records of Hatta harshly scolding workers while supervising construction. His management style leaned more toward paternalism than pure modern humanitarianism, and differences in treatment between Japanese and Taiwanese employees still existed¹².

The "Biting Canal": Farmers' Suffering and Systemic Exploitation

Although Yoichi Hatta made outstanding contributions to Taiwan's agricultural development, historical evaluations of him have always been polarized. Some views hold that the Chianan Canal was built by the Japanese colonial government to extract Taiwan's rice resources and supply demand in metropolitan Japan. The most controversial aspect was the "three-year crop rotation system" implemented by the Chianan Canal: farmers were forced into district-based rotations of rice, sugarcane, and mixed crops, losing their freedom to choose what to plant. This system primarily ensured supplies of rice and sugar to Japan, secured raw materials for Japanese-capital sugar factories, and solved Japan's domestic problem of competition between rice and sugar at the time¹³.

Farmers' burdens went far beyond this. Of the total project cost of 54 million yen, about half was borne by "irrigation association stakeholders" (mostly landlords), who repaid it year by year through "temporary assessments." Landlords then shifted the burden onto tenant farmers, causing many poor farmers who could not pay to be forced to sell land or give up tenancy¹⁴. Even in years without water, farmers still had to pay high water rents, worsening poverty. In 1927, to build the reservoir, 150 farming households were forcibly relocated to coastal areas, sparking years of protest¹⁵. Farmers also had to perform unpaid labor to maintain the canal, and the irrigation association was even mockingly called the "water-harm association"¹⁶. During the Great Depression, the benefits of increased production did not reach the lower classes; farmers still often ate dried sweet potato shreds, while most rice was shipped to Japan. As a result, some farmers called the Chianan Canal the "biting canal," giving rise to farmers' movements and media criticism, such as in the Taiwan Shin Min Pao¹⁷.

📝 Curator's note: The "two-sidedness" of the Chianan Canal is key to understanding Taiwan's colonial history. It was both a symbol of modernization and a concrete embodiment of Taiwanese farmers' exploitation under the colonial economic system. This contradiction is precisely where the tension of history lies. Increased production was also mainly related to varietal improvements such as Penglai rice and to Japan's broader infrastructure development, rather than being attributable entirely to the canal¹⁸.

Hatta Sotoki: Postwar Despair, Drowning, and Complex Emotion

Yoichi Hatta's wife, Hatta Sotoki, was also an indispensable part of this Taiwanese connection. After marrying Hatta, she came with him to Taiwan, raised eight children, many of them born in Taiwan, and devoted her life to her family and this land. In 1942, while Hatta was on his way to the Philippines, the ship he was aboard, the Taiyo Maru, was sunk by a U.S. submarine, and he died in the disaster¹⁹.

Three years after Hatta's death, Japan was defeated. On September 1, 1945, Hatta Sotoki, dressed in a kimono, drowned herself at the outlet of Wushantou Reservoir. This history is often romanticized as "following without regret," but behind it lay a far more complex background: after Japan's defeat, she faced pressure to leave Taiwan, as all Japanese people were required to depart, along with postwar chaos, insecurity in daily life, and grief over her husband. Some accounts say she was unwilling to leave Taiwan, or that she felt despair over the situation after the Republic of China took over. She left a suicide note with wording similar to "brothers and sisters, live in harmony" and "admiring my husband, I am willing to follow him," choosing to die on the 25th anniversary of the start of construction on the Chianan Canal²⁰. The suicide note and related details show that this was not simply a romantic death for love, but a tragedy under multiple pressures, reflecting the trauma and despair of defeat. Her remains were buried beside Wushantou Reservoir, where they rest together with Yoichi Hatta's ashes, jointly watching over the land they had once deeply loved and to which they had given everything²¹. Every year on May 8, people from across Taiwan hold a memorial ceremony at Wushantou Reservoir to express gratitude for Hatta's contributions and to remember the couple's deep affection for Taiwan²².

Historical Reverberations: Yoichi Hatta's Contemporary Political Symbolism and Imprint

The completion of the Chianan Canal completely transformed the agricultural landscape of the Chianan Plain, making Taiwan an important food-producing region. Yoichi Hatta was not only an outstanding engineer, but also a visionary planner. Yet as a technocrat under the colonial system, evaluations of his achievements and faults have remained polarized in Taiwanese society.

The 2017 beheading of Yoichi Hatta's bronze statue brought the complexity of this history to a peak. The incident was a counteraction by pro-unification figures against the movement to remove Chiang Kai-shek symbols, reflecting Taiwanese society's complex feelings toward the history of the Japanese colonial period: affirmation of its construction achievements coexists with reflection on colonial oppression²³. Annual memorial ceremonies also often become political symbols. Some views hold that the deification of Hatta risks diluting the Kuomintang's contributions or promoting a "colonial nostalgia" narrative; other accounts point out that Hatta himself was a technocrat, not a direct military oppressor, but that his project undoubtedly served the overall colonial system of the Japanese Empire²⁴. Chinese Communist media have also used this to criticize Taiwan for being "pro-Japanese" and for the plunder of rice²⁵.

The story of Yoichi Hatta reminds us that when evaluating historical figures, we should move beyond a single perspective and understand the complexity and multiple dimensions of the era in which they lived. His contribution was not only an achievement in hydraulic engineering, but also a symbol of deep affection for and selfless dedication to the land of Taiwan; at the same time, it bears the heavy imprint of colonial history. This hydraulic spirit, and the historical reverberations surrounding it, continue to influence Taiwan's agricultural development as well as its social and cultural identity²⁶.

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