呑川

From a humble spring in Setagaya, the Nomi River begins its journey. The Nomi River flows eastward, carving a path through the heart of Tokyo. It meanders through Setagaya, Meguro, and Ota wards, finally reaching Tokyo Bay. This 14.4km waterway has a rich history, intimately tied to the lives and landscapes it touches. The Nomi River isn’t just a river. It’s a time capsule, reflecting Tokyo’s transformation from rural tranquility to bustling metropolis. The Nomi River basin, covering approximately 17.7 square kilometers, has known its share of hardship. Over the years, typhoons, heavy rains, and urbanization have led to devastating floods. One such flood, in July 1960, submerged about 5% of the basin. This resulted in extensive damage to over 3,000 homes. Even in recent times, the Nomi River has faced flooding challenges. Despite these challenges, the Nomi River remains a vital part of Tokyo’s ecosystem. Today, the Nomi River enjoys a 100% embankment completion rate. This is a testament to the city’s commitment to flood prevention and river management. The river’s upper reaches and the Kugayama-kei River, a 2.6km tributary, now flow beneath the city as part of the underground drainage system. Downstream from Sakaguchi Bridge, rainwater is directly discharged into Tokyo Bay through this same system. This innovative approach not only mitigates flood risk but also helps maintain a consistent flow in the river, even during dry periods. Interestingly, the primary water source for the Nomi River today is highly treated water from the Tocho Sewage Treatment Plant near Koganei Bridge. This recycled water, introduced as part of the city’s “Southern Three Rivers Clean Stream Revival Project,” is a crucial element in the river’s revitalization. So, as you stand by the Nomi River, remember, you are witnessing more than just flowing water. You are observing a story of resilience, adaptation, and the ongoing relationship between a city and its river.