国土交通省北海道開発局 釧路開発建設部 -せんけんフォーサイト-

　The water environment, including river water and groundwater, relates closely to the mire ecosystem. It should be conserved.

　Using nitrogen load as an indicator, this load should be reduced by about 20%. To achieve this, buffer zones and settling basins should be provided in the drainage basin. In addition, to promote agriculture that is sympathetic to the natural cycling of materials, instruction and support must be provided to individuals regarding the disposal of livestock excreta in the vicinity of livestock sheds and adherence to the standards for fertilizer application. To devise more specific measures for the drainage basin, the effects of these measures should be evaluated within the experimental area of the Kuchoro River. As in the case of measures for individuals, prompt action should be taken throughout the drainage basin.

　Groundwater levels should be determined and their relation with the ecosystem should be examined. Necessary measures should be taken to conserve the groundwater environment such that it is suitable for the mire. The changes in water level at Lake Akanuma and those of the areas along both banks of the Kushiro River should be examined.