Taking the opportunity of the 30th anniversary of the Japan Society of Hydrology and Water Resources, the progresses of the society are reviewed and the issues of future developments are summarized. In particular, based on the discussions at the two symposiums commemorating the 30th anniversary, taking into consideration the disaster with very heavy rain in the summer of 2018 and the changing climate, the future perspectives are presented, including 1) it is required to tailor the "arena" to implement academic and government cooperation, 2) "trans-disciplinary” and advanced research for hydrological phenomena will continue to be developed utilizing various innovative technologies, and 3) contribution to the "world framework” is to be enhanced, on the "global issues" with “international context".

 This paper outlines the current status of flood runoff analysis for urban watersheds and presents its future prospects. First, I will describe the urban flood disaster, then briefly review the history of the runoff models before explaining the current state of application of flood runoff models for urban watersheds. Next, storage function models as the lumped conceptual model are outlined, and the urban storage function (USF) model is explained. Then, the necessity of a detailed distributed physical model in urban watershed is described by explaining the difference between mesh data and the urban landscape GIS delineation. I introduce TSR model which is a precise distributed physical model utilizing the urban landscape GIS delineation. Finally, I overlook the future issues to be solved for lumped conceptual and distributed physical models as well as making some recommendations for reduction of urban flood disaster.

 This paper overviewed articles categorized in “Type A” of Journal of Japan Society of Hydrology and Water Resources, contributed by geographers in recent 30 years. We also discussed how geographers have contributed to the problems to be solved by around 2020 that were raised at the beginning of 21st century. We defined “the contributions by geographers” as “Type A articles that more than or equal to half of the authors belong to institutes related to geography at the time of publication”. “The contributions by geographers” occupied about 9 % of all articles categorized in “Type A”, and they showed the peak in 2005. The contributions by “Research note” and “Original article” were equal in 2005 which characterizes “the contributions by geographers”. Researches abroad were mainly conducted in Asia, while domestic researches were concentrated in Tsukuba and Tokyo. Mostly cited keywords were “Remote sensing” (7 times), “NDVI”, “Stable isotope”, “Seasonal change”, “Precipitation”, “Vegetation index” and “Snow water equivalent” (4 times for all). In 1990s, data analysis including review paper was the majority of “the contributions by geographers”, while the ratio of observation had increased towards the end of 2000s. In 2010s, the ratios of observation and data analysis were equal such as in the beginning of 2000s. As for the problems to be solved by around 2020, geographers have apparently contributed to editing Hydrological Research Letters, preparation of observed database, discovery of hydrological processes, promoting international cooperative researches, and publication of textbook of hydrology.

 The study trends of the hillslope hydrology and related researches in the forested catchment were reviewed in the recent 30 years. Until the end of 1980’s when the Japan Society of Hydrology and Water Resources has been founded, fundamentals of physical aspects in hillslope hydrology have mostly been established. After this period, there were several directions of further developments of research subjects beyond the above fundamentals. One is the precise description of elemental hydrological processes using chemical and isotopic tracers. These progresses were strongly supported by improvements in chemical and stable isotope analysis. The other development was recognized as the usage of hydrological information in the biogeochemical processes in the catchment ecosystems. Researches describing nutrients dynamics have continuously been recognized their importance in the north America, Europe and Japan, while the related subjects change from acid rain influences to nitrogen saturation. Mechanistic understanding of the hydrological phenomena under an extreme meteorological event is currently one of the most important subjects in the context of the adaptation to global change. The understandings on disturbance and recovery processes in catchment ecosystems are becoming important as fundamentals for planning resilient countermeasures against the natural disasters.

 This paper reviews recent decades’ researches on impact of agricultural activities on water and material circulation and its countermeasures, those on numerical modeling of water and material circulations considering agricultural activities. For impacts of agricultural activities, flood discharge control by “Paddy Field Dam” and flood discharge control function of mountainous and intermountain areas were reviewed as flood mitigation function of farmlands, and pollution loads from farmland and effect of cycling irrigation on water quality improvement was as water quality control function of farmland. For numerical modeling of water and material circulations in river basins including farmland, examples of a numerical model of water circulations including irrigation and drainage management of paddy field in Monsoon Asia, and application example of evaluation of climate change impact on water usage for agriculture was introduced. Moreover, application of Irrigation Management Performance Assessment Model and application of the model to arid area are introduced as a comprehensive water circulation model and its application.

 Twelve young researchers in the Japan Society of Hydrology and Water Resources review histories and future perspectives in the field of hydrology and water resources research. This review intends to describe its state-of-the-art and to record ongoing research activities by early-career researchers. This review article covers the broad field in hydro-climatology/meteolorogy, data analysis for hydrology and water resources research, catchment hydrology, environmental hydrology, and irrigation and drainage engineering. In addition, we have obtained the following suggestions and perspectives in this research field: the evaluation of practical studies, progresses in field observation and numerical analysis, extensions of control problems by emerging AI technology, further encouragement of interdisciplinary research, the better evaluation system of research outcomes, and the importance of data sharing.

 Groundwater related papers published in Journal of JSHWR during 10 years can be divided into six topics. These are: infiltration, soil water content, groundwater chemistry, recharge processes, flow and transport modeling, and groundwater-surface water interactions. The contents of these papers are mainly along pure hydrological processes. Recent trends in both domestic and international journals in groundwater research show a wider distribution of subjects. Thus, it is expected that new scopes will develop in the future.

 In this paper, future perspective of isotope hydrometeorology using stable water isotopes is described, in addition to past 10 to 20 years research achievement in this field.

 This is a report on the 2018 annual Conference of Japan Society of Hydrology and Water Resources in Mie.