Storage and drainage pumping station and No. 2 pumping station in North Chiba, Japan (at North Chiba Channel)
Multipurpose facility with three functions for achieving flood control, irrigation, and purification
Overview of pumping stations
Location: Inzai City and Kashiwa City, Chiba Prefecture
Maximum discharge water volume：North Chiba storage and drainage pumping station, Storage 40 m3/s, Drainage 80 m3/s
: North Chiba No. 2 pumping station 40 m3/s
No. of units installed: North Chiba storage and drainage pumping station 10 m3/s x 5 units, 30 m3/s x 1 unit
: North Chiba No. 2 pumping station 5 m3/s x 2 units, 10 m3/s x 3 units
Type: North Chiba storage and drainage pumping station
Vertical-shaft volute mixed flow pump, diameter of 3600 mm (30 m3/s), engine-driven
Discharge nozzle diameter of 2000 mm (10 m3/s) motor and engine-driven
: North Chiba No. 2 pumping station
Vertical-shaft volute mixed flow pump, diameter of 2000 mm (10 m3/s), motor-driven
Diameter of 1500 mm (5 m3/s) motor-driven
Issues and solutions
[Flood Control]
The lowland areas in the Tegagawa and Sakagawa river valleys have good accessibility to the Tokyo metropolitan area and have resulted in rapid urbanization. However, this made it difficult for rainwater to soak into the ground, causing flood damage to become more pronounced and necessitating flood control measures.
[Irrigation]
Demand for water from the Edogawa River, which flows into the Tokyo metropolitan area, has increased due to population growth. The extensive use of water made it necessary to supply water to the Edogawa River from the Tonegawa River, since it has an abundance of water.
[Purification]
Teganuma was a beautiful marsh that was rich in fish and used for fishing and local agriculture, but the water quality of the marsh deteriorated due to the urbanization of the area around the marsh that began in the 1960s, resulting in domestic wastewater and blue-green algae. Therefore, clean water from Tonegawa River was injected into Teganuma to improve the water quality.
Features
VR Tour
Visiter center outside
Visiter center 2F
North Chiba storage and drainage pumping station
Engine for dedicated drainage pump (3600 mm, 30 m3/s) and speed reducer (one in the foreground of the photo), engines, motors, and speed reducers for storage and drainage integrated pump (2000 mm, 10 m3/s) (five units in the background of the photo)
Five motor and engine-driven storage and drainage pumps (2000 mm, 10 m3/s) were installed.
One engine-driven drainage pump (3600 mm, 30 m3/s) was installed.
The discharge pipes of five storage and drainage pumps (2000 mm) were connected to a φ5400 mm drain confluence pipe, and water from the Tegagawa River is directed into the Tonegawa River during drainage operation. During storage-water pumping operations, two Φ3200 mm buried pipes branch from the drain confluence pipes and provide water to the water landing well at the North Chiba No. 2 pumping station, 14.8 km away.
North Chiba No. 2 pumping station
Motors (large/small) for pump (1500 mm, 5 m3/s) and speed reducer (foreground of the photo)
Two pumps (1500 mm, 5 m3/s) (two units in foreground of photo), three pumps (2000 mm, 10 m3/s) (three units in background of photo)
The discharge pipes of five water-storage pumps (2000 mm and 1500 mm) are connected to a φ3400 mm drain confluence pipe, from which two φ3200 mm buried pipes branch out to provide water to the Sakagawa River discharge outlet, 7.4 km away.
Water from the Tonegawa River sent from the North Chiba storage and drainage pumping station (Inzai City) flows through an overturning gate from a water landing well (foreground of the photo) at the North Chiba No. 2 pumping station (Kashiwa City) into the Teganuma Marsh. In addition, water from the water landing well is pumped by the North Chiba No. 2 pumping station to the Sakagawa River discharge outlet, where it then flows through the Sakagawa River to the Edogawa River.