Purpose
Aimata Dam provides flood control from the Akaya River to the bank of the merged Tonegawa River, rated to cut a (1947) Typhoon Kathleen-level design flood of 650 tons per second to 330 tons per second (cutting 320 tons per second). It maintains customary water rights of 140 tons per second for irrigation water (with unspecified usage permissions) to the city of Kuki in Saitama Prefecture, and also creates energy via the Aimata electricity generation plant, with a permitted output of 7,300 kW, and the Momono electricity generation plant, with a permitted output of 6,200 kW. Afterward, the #2 Aimata electricity generation plant (120 kW) was added, to make use of the sustained effluent. Each generation plant is independently run at the prefectural level by the Gunma Prefecture Public Enterprise Bureau.
Currently, the dam functions as a valuable source of water for the capital region, and is controlled via the Tonegawa River Integrated Dam Group Operation Office in the city of Maebashi. The dam site itself is cut into a large "V" shape, and is fairly tall in proportion to its length.
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