Does willingness to pay for the traditional flood control measures kasumitei vary by river section of residential area?

Abstract

Kasumitei(open levees) comprise a traditional flood mitigation measure used in Japan. Kasumitei allow floodwater to flow into surrounding paddy fields, which act as temporary flood mitigation basins. After flooding, debris accumulated in paddy fields often brings crop damage and debris removal costs. Therefore, in some areas, the disaster mitigation functions of kasumitei may bring about conflicts between beneficiaries (downstream residents) and burden bearers (midstream residents). Ensuring the continued use of kasumitei in the future requires a mechanism to support the burden bearers. This study aimed to test the hypothesis that the willingness to pay (WTP) for maintaining the kasumitei would be lower for midstream residents (potential burden bearers) than for upstream (irrelevant) and downstream residents (potential beneficiaries). The results showed that contrary to the hypothesis, WTP for maintaining kasumitei was not affected by the river sections of the respondents’ residence. Thus, a financial support scheme for maintaining kasumitei might be acceptable regardless of the beneficiary or bearer in the surveyed respondents. In addition, respondents with higher interest in ecosystem conservation tended to have higher WTP. Therefore, to gain support for the maintenance and use of the kasumitei (a type of ecosystem-based disaster risk reduction), the authorities would promote awareness of the measure’s contribution to ecosystem conservation. Based on the results, we discussed the potential financial support schemes for maintaining the kasumitei.