The park serves as a retention basin designed to hold excess rainwater during typhoons and heavy downpours to prevent local flooding.
The water quality in the Hikichi River is monitored as part of an ongoing restoration project that utilizes the park's wetland vegetation as a natural filter.
It is a recognized habitat for the Nannophya pygmaea, known as the 'little white-faced skimmer,' which is one of the smallest dragonflies in Japan.
The park's boardwalk construction was specifically engineered to allow for plant root growth and sediment movement beneath the path structures.
Hikichigawa Water Park is a riverside green space in Fujisawa designed primarily for water-based ecological preservation and flood control. The park stretches along the Hikichi River, utilizing the natural floodplains to create aquatic habitats for local flora and fauna. It functions as a 'wet botanical garden' featuring boardwalks and observation paths that allow visitors to traverse swampy, marsh-like environments safely. The park integrates native Japanese vegetation, particularly irises and various wetland grasses, which serve to purify the river water naturally. The area is maintained as a multi-functional basin, balancing recreational walking paths with essential urban drainage infrastructure. Its design emphasizes minimal human interference, focusing on the observation of dragonflies, small amphibians, and local bird species. The park is characterized by its linear layout, connecting sections of the city through dense vegetation and over-water wooden walkways.
The central observation bridge that offers a clear, linear perspective of the river corridor and the iris fields.
Bring insect repellent, as the marshy environment encourages significant mosquito and biting fly activity during warmer months.
Wear closed-toe, comfortable walking shoes, as the wooden boardwalks can be slippery when damp.
Visit during the early morning hours to see the greatest variety of birdlife and avoid the heat reflected off the water.
Do not attempt to walk off-path into the marshy areas, as the mud can be deep and the flora is protected.
Stay on marked boardwalks to protect fragile wetland ecosystems; do not feed local wildlife.
