It has been raining quite heavily over the last week or so in Saga, because it is spring, and we usually get most of our rain in this growing season, and in the wet season of early summer. And all of the rain means that Saga's many waterfalls are running faster, and a thousand dormant ones will be running again. A short drive in any direction in Saga, or for that matter just about anywhere in Japan, will take you within easy access of many of them.
Obuchi falls, just a few minutes drive to the North of Saga city limits, runs quite hard during summer.
There are several large falls in Saga, at places like Kannon no taki, and Mikaeri no taki, which both run and roar pretty hard in summer, and even have plenty of water in them during the off seasons. But there are many, many smaller falls that become quite spectacular during the spring and summer rains. And there are countless numbers of small, beautifully hidden falls deep in the forest, shaded over by thick growth, but that can still be reached by a short walk.