Case Studies

Flood Control / Rainwater

Expressway Underpass Drainage System

Expressway Underpass Drainage System
Japan

At an expressway junction
This pump system serves to drain a municipal road that passes under an expressway junction, via two rainwater regulating pits.

Rainwater that falls over a wide area of the junction is not directly channeled to the small class river running nearby. Instead, while rain is falling, it is temporarily collected in a holding pond where it is held until it can be pumped safely to the river after the water level in the river has lowered.

A municipal road that passed under a national highway was extended in the east-west direction when the junction was built. Two rainwater drainage pits were built and pumps were installed to drain rainwater collected from the underpass.

Specifications of Installed Equipment

Installed Equipment Specifications
Pumps with Channel Impeller Model : B
Number of units : 4 units
Pumps with Vortex Impeller Model : U
Number of units : 2 units
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