Combination of structural and non-structural measures of water supply and sewer system based on conscious and ownership of local residents

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  • 住民意識を考慮したソフト・ハード両面からの上下水道減災対策の最適化手法の提案

Abstract

 In small-scale city, where populations are aging and decreasing, not only structural measure but also non-structural measure of water supply and sewer system against natural disaster are useful. To plan the effective non-structural measure, consciousness of local residents are important. This study proposes a combination method of structural and non-structural measure through a case study in Wajima district of Wajima City, by a questionnaire investigation to the local residence. Degree of recognition of low earthquake-resistant of water supply facilities was very low and storage of water was few. Although average acceptable days of water supply cutoff were 3 days, willingnesses to pay (WTP) for structural measure of water supply. The public information of water storage is important. Comprehension of limitation of water usage during the damaging period of sewer system was relatively high, and average acceptable days of portable toilet usage were 5.6 days. Willingnesses to pay (WTP) for structural measure of sewer system was 190 yen/month, and WTP for portable toilet was 66 yen/once. Storage of portable toilet by government was estimated to be useful for limitation of water usage.

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