Water Quality Change in Drainage Canals with the Promotion of Small-Scale Rural Sewage System in Hirata Town of Takasu Waju Area.

概要

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Low-lying agricultural land frequently encounter severe water quality and drainage problems caused by many factors including stagnation of wastewater, rain and flooding from rivers. The research was mainly concerned with the change of household wastewater quality in drainage canals in accordance with the promotion of small-scale rural sewage systems. The study was conducted in the Hirata Town of Takasu Waju area of Gifu prefecture. Waju is the farming settlement protected by the circular dykes. Hirata town is famous for its sightseeing spot, Ochobo Inari (Shrine), where many people visit, is expected to have pollution from its wastewater. In order to clarify the increase or decrease of household wastewater pollution, we investigated 13 spots of the drainage canals of the study area after considering the inflow and outflow of the drainage water. The daily pollution load of water quality parameters were calculated for each survey month. Results showed that pollution load of community decreased year by year as a result of wastewater treatment plant and near future if utilization percentage increase, water quality in drainage canals would be more improved. However, water quality improvement in the downstream section could not be seen from the past five years data. Countermeasure should be taken to improve the overall water quality in the study area.
水文・水資源学会の論文