An economic evaluation of the value of improving the water quality in Lake Kasumigaura:in comparison with Lake Biwa

概要

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The comparison of 4 questionnaires on city tap water revealed interesting facts concerning the effectiveness of filtering the Kasumigaura lake water. The filtration facilities consists of activated carbon and microorganism' s purification. A portion of people who claimed odor of chlorine and other agents in the tap water became about a half in these two decades. However, even now, about 21 percents of people who use the water taken from the lake complain of smells besides chlorine, and about 40 percents say that the water taste is not good. The people of Tsuchiura city by the lake want to avoid health interference by the poor water quality. The "preventive-expenditure" required, as estimated from revelations in the questionnaires is 43.4 billion yen per year for 390-thousand water users. Tsuchiura people's " willingress-to-pay" to improve the lake water quality is approximately same as that by people by the Biwa Lake. They are Yen 5, 454 for the former and Yen 3, 964 per person per month for the later, respectively. If they invest the sum to improve the Kasumigaura water quality, the present value will reach Yen 482 billion with a 5-percent discount rate and a project life of 3 decades.
日本マクロエンジニアリング学会の論文