Until now, flood control methods in Japan have been based on dams and reservoirs completed within the river area. However, recent catastrophes such as the typhoon throughout Japan in 2019 (Typhoon Hagibis) have exceeded such capacity that such infrastructures cannot hold the disaster anymore. Therefore, the Central Government has proposed the "River Basin Disaster Resilience and Sustainability by All Project" to promote the prevention of water-related disasters by all stakeholders from the catchment area to the flood area, based on the idea of basin flood control. In May 2021, the government revised The Act on Countermeasures against Flood Damage of Specified Rivers Running Across Cities and established a "Retention Zone Conservation System." While the government is finding ways that are highly resilient to floods in urbanized areas, governments are unsure how stakeholders, especially farmers, should deal with flood risks around the riverine in Japan. Tanaka Reservoir in Chiba Prefecture, Japan, is adjacent to the Tone River, a Class A river. The majority of the sites are crop areas. This study aims to clarify the conditions and issues of farming in Tanaka Reservoir to obtain suggestions on balancing flood damage and farming in places with high risk for flood damage outside of the riverine. The study was conducted through an interview with the administrator of Tanaka Reservoir, Tone Land Improvement District, and Someya Farm, the only farming corporation in the reservoir. In addition to the interview, we conducted questionnaires on eleven personal farmers who experienced flooding at the Tanaka reservoir. From the interview, we have clarified the history and management conditions of Tanaka Reservoir. In the questionnaire, we clarified the characteristics of farmland within the river area and the flood control measures. The questionnaire contained each respondent's age, farming experience, products and delivery destination, their management condition on products, and crop insurance. The results of the surveys are as follows. Firstly, since the reclamation of Tanaka Reservoir, when one wants to own the farmland, it has become mandatory to submit a "Tone Recreational Area Agricultural Land Use Agreement." In the contract, it states that "no compensation shall be demanded for any damage caused to the reclaimed land due to flood control" and "if the owner transfers the ownership of the farmland between landowners, the preceding clauses (no compensation shall be demanded for any damage) shall be inherited" Even now there is no compensation from the government due to flood control. However, this is inevitable since Tanaka Reservoir is in the River Zone, meaning it is always at risk of flooding. Therefore, most farmers and farming corporations have crop insurance coverage. Regarding insurance in a disaster, 8 of the 11 farmers (73%) who responded to the survey had insurance, which is higher than the Chiba Prefecture average of 63%. The insurance coverage prevented major damage to the business, though farmers had difficulties removing debris. Secondly, in the results of this questionnaire and the interview survey, only a few farmers were devising products concerning their clients. Someya Farm cultivates rice, wheat, soybeans, and blueberries to provide school lunches and pass on the importance of food to future generations. At the same time, they are also preparing for contingencies by growing wheat in winter to reduce the risk of flood damage. However, in the questionnaire, 9 out of 11 farmers(82%) were not free to choose what they grew because of their relationship with their customers, and their clay soil limited suitable varieties. Most were rice farmers, and nearly half of the respondents sowed rice earlier than usual. For vegetables, their strict standards make it impossible to harvest early before the heavy rains.