• Journal of Korea Water Resources Association
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• v.39 no.1 s.162
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• pp.11-22
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• 2006

This study is that MD-FDA and the existing method were applied together the outlet project under the construction in the Gulpo River basin. The results of both of them mot the economic feasibility of the Project. But, MD-FDA evaluated the suitable damage according to situations; 1) without project, 2) after 20m outlet construction, 3) after 80m outlet construction. That is, MD-FDA could exactly evaluate the Annual Expected Flood Damage by considering the characteristics to the inundated area. If M-FDA may use in the flood control projects, the projects will be able to be taken into account all characteristics of the total damage area and performed by reasonable criteria.

• Proceedings of the Korea Water Resources Association Conference
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• 2009.05a
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• pp.1642-1646
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• 2009

본 연구에서는 이들 문제점을 극복하기 위해 수도권을 대상으로 하여 용수를 사용하는 소비자의 BOD 개선정도별 지불의사(WTP)를 설문을 조사하고, 설문결과를 통계분석하여 수질개선(BOD)-지불의사(WTP) 관계식을 도출하였다. 이때 설문응답자가 최대한 설문대상재화를 객관적이고, 쉽게 이해할 수 있도록 설문지를 작성하였다. 사례연구로서 낙동강수계의 내성천 지방2급하천 구간에 계획한 송리원다목적댐을 대상으로 상수도 원수수질개선에 대한 편익을 산정하였다. 사례연구로서 낙동강수계의 내성천 지방2급하천 구간에 계획한 송리원다목적댐을 대상으로 적용하였다. 방류시나리오별 연평균편익산정 결과, 연평균계획방류량$(4.79\;m^3/s)$ 방류시 5,980 백만원, 풍수기(7$\sim$10월)를 제외한 기간의 계획방류량$(7.22\;m^3/s)$ 방류시 8,663 백만원, 수질악화기 계획방류량$(10.72\;m^3/s)$ 방류시 11,905 백만원, 최대계획방류량$(13.54\;m^3/s)$ 방류시 14,502 백만원으로 산정되었다. 본 연구에서 개발된 가구소득별 수질개선(BOD)-지불의사(WTP) 관계식을 이용함으로써 수질개선사업에 대한 원수수질편익을 산정할 때 사업전 후의 수질분석만 이루어진다면 실무에서 활용 가능한 편익산정방법이 될 수 있을 것으로 판단된다.

• Proceedings of the Korea Water Resources Association Conference
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• 2008.05a
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• pp.1540-1544
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• 2008

최근 기후변화의 영향일 것으로 추정되는 이상가뭄의 발생빈도가 잦아지는 상황에서 이에 대한 대비책으로서 댐의 비상용량을 비상용수로 공급하는 방안이 조심스럽게 제기되고는 있으나 현재까지 국내에서는 비상용수에 대한 명확한 정의조차 제시되지 않는 등 다소 생소한 개념이라고 할 수 있다. 본 연구는 비상용수 공급의 국내 외 사례와 비상용수 공급편익 산정에 관한 국내 외 연구를 검토하여 댐에 의한 비상용수 공급의 가능성과 가치를 평가하는 것을 목적으로 한다. 비상용수의 수요는 정기적으로 발생하지 않는 특수한 경우이고 용수공급을 대체할 만한 대안이 거의 없는 극한 상황에서 발생한다. 그러므로 생 공용수의 편익산정 방법에 일반적으로 이용되는 대체시설비용법과 같은 편익산정 기법을 적용하는 것은 여의치 않을 것으로 판단된다. 그리하여 본 연구는 비상용량이 사용될 때의 갈수빈도와 갈수피해액의 관계를 설정하고 피해경감액을 추정함으로써 연평균 편익을 산출하는 방안을 검토하는 방안을 제안하고자 한다. 비상용수 공급편익의 합리적인 계량화하기 위해서는 적절한 이수안전도의 설정과 이에 따른 이수기능의 평가가 선행되어야 한다. 그러나 아직까지 갈수규모에 따른 비상용수 공급편익의 산정방법에 대한 명확한 기준이 마련되지 않은 실정이다. 따라서 향후 비상시 댐의 이수기능을 최대한 활용하고 이에 대한 올바른 가치평가를 위해서도 관련분야에 대한 기초연구가 시급히 이루어져야 할 것이다.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.29 no.5B
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• pp.419-427
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• 2009

In existing studies about benefit of water quality improvement using WTP, the object of survey is described pre-policy water quality as "current water quality" and improved (post-policy) water quality as "boatable, fishable and swimmable". Multiply WTP by the number of households of basin is total benefit. The existing studies are not benefit of a specific water resource business but benefit of a policy on unsubstantial water resource business. Because of a lack of objectivity and oversimplification, it is difficult for survey respondents to understand an object of survey. The purpose of this study is to evaluate a benefit estimation methodology for raw water quality improvement in water resource development business. After conducting a survey of WTP of 1,000 housewives who is using water service in the National Capital region, the relational expression of water quality improvement (BOD) and WTP is derived by using statistical analysis of the survey. As a case study, the stream water quality improvement benefit of Song Li Won multipurpose dam was evaluated, which is planned to be built at the local secondary stream section on Nae Sung stream in Nak-Dong River system. As a result of study, annual average benefit evaluation is 5,980 million won on the average annual planned discharge, 8,663 million won on the planned discharge during the period except for wet season (July to October), 11,905 million won on the planned discharge during water quality declining period and 14,502 million won on the planned discharge during water quality declining period respectively. By using the relational expression of BOD-WTP, it is easy to estimate the benefit without regard for water quality.

• Journal of Environmental Policy
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• v.6 no.1
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• pp.83-109
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• 2007

This study evaluates citizen's willingness-to-pay for the benefits from improved water quality of the Taehwa river in Ulsan, Korea, using a contingent valuation method with double-bounded dichotomous choice. The estimation results of the bivariate probit model shows the amounts of willingness-to-pay are monthly 3,458.5 Korean Won per household and yearly 14,760 million Korean Won for total households in Ulsan, Korea. These estimates are equivalent to the social values of improved water quality of the Taehwa river. This study also tests the inter-dependence between two answers, which may occur in the responses of the questions for the double-bounded dichotomous choice, and all the null hypotheses on the inter-dependence are rejected in this study.

• Journal of Korea Water Resources Association
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• v.42 no.4
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• pp.343-353
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• 2009

The objective of this study is to evaluate the effect of the water quality improvement by water discharge through dams and to provide a benefit estimation methodology, taking domestic situation into consideration, by the replacement cost approach analyzed with a sewage treatment plant instead of an alternative dam. To this end, facility that alternates a dam must have same functions of the discharged water from the dam and the two facilities must be able to be compared objectively. To estimate the benefit, estimation methodology of alternative facility's cost is established and criteria of cost.benefit analysis that are duration period and ratio of large scale repairing expense was presented. As a case study, the water quality improvement benefit of Song-Li-Won dam was evaluated, which is planned to be built on Nae-Sung stream in Nak-Dong River system. The results of applying this methodology to Song-Li-Won dam are 644,006 million won of the annual average discharge and 1,351,526 million won of maximum discharge. The usage of the framework in this study is expected for estimation of water quality improvement benefit in case water quality improvement project is performed.

• Journal of Wetlands Research
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• v.24 no.3
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• pp.161-169
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• 2022

In this study to estimate suitable size of rain tank in Suwon district, monthly rainfall, daily rainfall duration curve and daily rainy days have been analyzed. Annual rainwater consumption and daily average amount of storage with respect to size of rain tank have been calculated by applying continuity equations that take account of daily rainfall, daily consumptive use, storage of rain tank, It has been shown that above 50 mm of rainfall in the ordinance related to reclamation water may be inappropriate regulation if annual amount of rainfall captured, efficiency of utilized rainwater, number of days for utilized rain tank, daily average amount of storage and daily consumptive use have been considered. Thus, it has been shown that suitable size of rain tank should be determined considering reasonable daily consumptive use with respect to district, constructed cost of rain tank and benefit of rain tank constructed.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.29 no.1D
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• pp.11-16
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• 2009

The estimation of total travel time on highway link for a day or year is the most important process for the feasibility analysis of highway or railway. Most of current guidelines for feasibility studies have been based on the time-traffic volume relationship from the BPR, and the traffic volumes have been determined by the application of the design hour factor to the annual average daily traffic volume. Both of the BPR function and the application of the design hour volume may result in the over-estimation of travel time due to the fact that the traffic volume on the large portion of highway links in Korea are close to the capacities. This study proposed a new way which is based on the distribution of hourly volumes for a year. It could be closer to the real situation, and provide more reasonable estimation. This methodology was validated for the national highways, but may be applicable for any type of highway with the AADT.

• Journal of Korea Society of Industrial Information Systems
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• v.23 no.4
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• pp.69-79
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• 2018

We performs the cost-benefit analysis, an economical analysis technique, to measure the effect of a shared public supercomputer. The costs of two given alternatives, to share the public supercomputer in a national center and to employ their own supercomputers in the organizations under the necessity, will be estimated and compared for decision making. In the case of sharing, we can simply predict the cost based on the results of the previous public supercomputer. The cost of individual introduction, however, is almost unpredictable since it has a remarkable variability due to the required system performances, locations, human factor, and so on. Accordingly, an objective and valid method to estimate the cost of individual cases will be proposed in this research. Finally, we analyze the economic effect of operating public supercomputer by comparing the sharing cost with that of the individual employs. The results of analysis confirms that the sharing public supercomputer will reduce the operational cost about 10.3 billion won annually compared with the individual introduction. Accordingly, it is expected that the sharing public supercomputer will bring a considerable economical effect.

• Environmental and Resource Economics Review
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• v.23 no.2
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• pp.331-347
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• 2014

The purpose of this study is to estimate the economic value of the recreational sea fishing in the Yellow Sea using count data model. For estimating consumer surplus, we used several count data model of travel cost recreation demand such as a poisson model(PM), a negative binomial model(NBM), a truncated poisson model(TPM), and a truncated negative binomial model(TNBM). Model results show that there is no exist the over-dispersion problem and a NBM was statistically more suitable than the other models. All parameters estimated are statistically significant and theoretically valid. The NBM was applied to estimate the travel demand and consumer surplus. The consumer surplus pre trip was estimated to be 254,453won, total consumer surplus per person and per year 1,536,896won.