2019 Volume 24 Issue 2 Pages 33-44
In this study, we investigated the water supply function of the primary open channel, which is 31 km, extending from upstream to end of the lower Aichi irrigation project. The target channel has been used only for agricultural purposes. Based on numerical computations, we examined the potential problems that could occur when the secondary channels are converted from an open channel type to a pipe flow type, while still using the existing amyl-type upstream water level control gate by the phase-I project.
Consequently, problems in water distribution such as supply shortage or unused water were predicted as unavoidable owing to the diurnal variations in open channel type waterway systems, even if supply was managed using upstream water level control gates connected in series.
The case where the length of the waterway is extended to 60 km, i.e., nearly twice the length of the target channel, it was predicted that the scarcity of incoming water volume tends to increase. Extension of the open channel length derives the delay in arrival time of water, because it requires considerable time for forming the surface slope.
