About Kawaguchi DamNaka river (main flow channel: 125km, contributory area 880sqr. meter), where the Kawaguchi Dam resides, is the second major river in Tokushima. Sakashu Power Plant (Ottachi Dam), Hinotani Power Plant (Nagayasuguchi Dam), and Kawaguchi Dam had been built, since the integrated river development has been implemented for flood control and water utilization. When Hinotani Power Plant hits the peak of power generation, the amount of water which is used for generating power, depending on how much power generated, fluctuates. Therefore, Kawaguchi Dam has been built as a regulating reservoir to alleviate the flow fluctuation at the lower reach. The effective capacity of the reservoir is 950,000 cubic meter and the water level gets adjusted in between EL93.50meter and 95.00meter.
Mechanism of water-power generation
Water-power generation generates electric power by the force of water which is dropped from height, hitting and turning the water turbine directly connected to the generator. The good thing about water-power generation is since it uses the natural force of water falling and not using fuel, it doesn’t produce any CO2 or much waste.
Kawaguchi Power Plant Kawaguchi Dam produces power by using water, which comes from adjusting the flow fluctuation to be less at its lowest reach when the rain could cause inundation. It produces 11,700 kilo watts of power per second from the maximum of every 70 tons of water used. Kaplan turbine (its blades are adjustable) is used for this dam to correspond with the changes of the lowest reach and the flow fluctuation.