Abstract
In order to establish the sustainable urban wa-ter cycle, it is necessary to evaluate potentials of utilizing secondary effluent and road runoff as self-owned water re-sources in urban areas. Groundwater replenishment by in-filtration of secondary effluent and rainwater is a promising option to secure self-owned water resource in urban area. Therefore, it is expected to understand the dynamic change of their water quality and to assess the risk and the accept-ability for water use. In this study, we conducted soil infil-tration column tests for secondary effluent and road runoff to evaluate the treatment performance. Furthermore, we proposed the comparative representation of water qualities of percolating water with those of rivers throughout Japan so that citizens could understand their water quality risk and acceptability for water use.
