Tokyo, Japan – As climate change increases the risk of flooding worldwide, understanding how floods form has never been more important. However, the science behind flooding is notoriously difficult to grasp, involving interactions among atmospheric, terrestrial, and human systems. Creating educational tools that simplify these processes without losing their essential scientific meaning has remained a major challenge.
In an article published in Water Resources Research , researchers from the Institute of Industrial Science, The University of Tokyo have been able to produce a model that is scientifically grounded and easy to understand.
Researchers introduced “SplashTune,” a gamified rainfall–runoff model that allows users to simulate how water moves through a landscape and observe how environmental conditions affect river flow and flood behavior in real time.
Explaining flood generation can be difficult as it is a multifaceted process that depends on many interacting components, including rainfall patterns and the movement of water both on and below the ground. Traditional explanations, while accessible to those with specialized scientific knowledge, are unsuitable for other populations.
“Hydrological models are inherently very abstract and complicated,” explains Dai Yamazaki, lead author of the article. “As people who know this firsthand, we wanted to lower the barrier to understanding these important topics.”
The result was SplashTune, an interactive model that visualizes hydrological processes such as infiltration and surface runoff using animated water particles. Players are tasked with matching simulated river flow patterns to target outcomes by tuning environmental conditions, receiving score-based feedback that encourages discovery through trial and error.
“We coined this approach ‘playable hydrology’ because we want students to have fun while they learn,” says Taishi Yazawa, a coauthor of the study. “We believe that there is a lot of scientific value in learner-centric approaches that encourage independent exploration.”
To evaluate SplashTune’s effectiveness, the team conducted a classroom study with 136 Japanese high school students. The results showed that students’ self-reported understanding of rainfall–runoff processes improved significantly after playing the game, particularly for concepts involving multiple interacting hydrological processes such as how soil moisture and land use affect flood timing and intensity.
“Our findings suggest that interactive, game-based learning can help students grasp abstract concepts that are challenging to visualize,” remarks Yamazaki. “By experimenting with different inputs and seeing immediate results, learners can discover how different factors work together to shape flood behavior.”
The researchers believe that their approach could help improve public understanding of flood risks and water systems not just in the classroom but also more broadly. By making hydrology both accessible and engaging, tools like SplashTune could better educate general audiences and communicate increasing climate-related challenges.
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The article, “Playable Hydrology: Learning about flood generation processes through the gamified rainfall–runoff model SplashTune,” was published in Water Resources Research at DOI: 10.1029/2025WR041550 .
The Institute of Industrial Science, The University of Tokyo (UTokyo-IIS) is one of the largest university-attached research institutes in Japan. UTokyo-IIS is comprised of over 120 research laboratories—each headed by a faculty member—and has over 1,200 members (approximately 400 staff and 800 students) actively engaged in education and research. Its activities cover almost all areas of engineering. Since its foundation in 1949, UTokyo-IIS has worked to bridge the huge gaps that exist between academic disciplines and real-world applications.
Water Resources Research
Playable Hydrology: Learning about flood generation processes through the gamified rainfall–runoff model SplashTune