Transmission Raw water from the Kiso River (hereafter “TRWKR”) needs
about 30km raw water transmission route from the Kiso River to the Horikawa
River. In order to control the new investment as economically as possible,
the existing water facility transmission and sewerage facility are utilized
as transmission route. Needless to say, these facility’s indispensable
functions for urban city are to supply safety drinking water stably and
to drain storm-water surely to avoid flood disaster. And the capacities
of these facility were designed more largely than usual required ones,
to secure high reliability according to technical criteria of water service
system planning and rainwater drainage system planning. In other words,
TRWKR uses surplus capacities of water service system and rainwater drainage
system. Thus, the capacity available for TRWKR sometimes runs short by
changing factors, such as; amount of rainfall, drought, water demand, accident
of facilities, and maintenance or renewal of facilities. The following
is that is the reason why TRWKR sometimes be interrupted.
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