asian dragon
attractions
concrete
disaster
disaster prevention
drainage
earths core
edogawa
facilities
field trips
flood
flood damage
harmonic pressure tank
heavy rain
heavy rains
japan
kasukabe
kasukabeshi
landscape
natural disaster
outer underground discharge channel
rain
rain water
river
saitama
saitama prefecture
spillway
study tours
tokyo metropolitan area
torrential rain
tour
tourism
tourist attractions
tourist destination
travel
typhoon
underground
underground drains
underground facilities
underground temple
underground tunnel
underground water road
water
water reservoir
water storage facility