• 한국조경학회지
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• 제34권4호
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• pp.116-128
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• 2006

This study focuses on hydrological changes caused by developments in the 13th, 14th (Motjarigol) district in Eun Pyoung New Town, Seoul on the basis of the Land Use Planning of development plan. Through analyses from the hydrological experiments about rainfall outflow using universal equation and amounts of infiltration through soils, the changes in amounts of overflows were estimated and the results were discussed from a urban ecological point of view. As a result, it has been predicted that the amount of rainfall outflow at post-development was dramatically increased, compared to pre-development. Installing of Derbris Dams and infiltration facilities were suggested as alternative plan to meditigate these changes. If we apply these alternatives, the rainfall outflow would be reduced up to 30% compared to the development plan without BMPs (Best Management Practice). In conclusion, it is proposed that once the ecological principles were considered during development planning process, we can minimize the adverse effects of developments to our environments.

• 한국지하수토양환경학회지:지하수토양환경
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• 제16권6호
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• pp.27-33
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• 2011

Infiltration plays an important role in the urban water cycle. Infiltration has a potential to contribute to groundwater recharge in addition to runoff reduction. However, infiltration in urban areas has been considered only as a means of runoff reduction. Conventional design methods for infiltration facilities assume soils to be fully-saturated for the sake of simplicity. The amount of groundwater recharge can not be estimated properly with this scheme. Hence, the characteristics of the unsaturated soil condition need to be considered. The finite element model using SEEP/W to estimate infiltration under the unsaturated condition is presented. Infiltration tests for Joomonjin sand are performed and the infiltration behavior of Joomoonjin sand under the unsaturated condition is measured experimentally to verify the validity of the finite element model. The results from comparing infiltrated volume between the saturated and the unsaturated conditions under the same soil and rainfall conditions show that the infiltrated volume in the unsaturated condition is two times bigger than that in the saturated condition.

• 상하수도학회지
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• 제23권2호
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• pp.223-230
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• 2009

Most urban water management systems are becoming vulnerable to flooding and drought due to the climate change (CC), urbanization and energy shortage. Despite of poor water management circumstances caused by extremely uneven annual rainfall and hilly terrain, traditionally we have made a sound and sustainable life based on our own philosophy and technologies which copes with our rigid environment. In this study a new paradigm of rainwater management is suggested and multipurpose and creative rainwater harvesting and management (RWHM) systems are introduced providing several case studies such as rainfall storage drainage (RSD) system, rainwater infiltration facilities and star city RWHM system. This new RWHM paradigm leads Seoul Metropolitan Government (SMG) in the Republic of Korea to change regulations and politics for the integrated RWHM. Finally, RWHM is expected to improve the safety, efficiency, energy consumption of urban water infrastructure, to reduce urban heat island phenomenon and, furthermore, to contribute in finding solutions for worldwide water issues and to adapt CC.

• 한국물환경학회지
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• 제36권1호
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• pp.29-35
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• 2020

To manage the non-point source pollution and restore the water circulation, many technologies including infiltration or reservoir systems were installed in the urban area. These facilities have many problems regarding maintenance as their operation period becomes lengthier. The purpose of this study was to estimate the optimal maintenance timing through a long-term load test on the infiltration trench as one of the low impact development techniques. An infiltration trench was installed in the demonstration test facility, and stormwater was manufactured by Manual on installation and operation of non-point pollution management facilities from the Ministry of Environment, Korea and entered into the infiltration trench. Particle size distribution (PSD), suspended solids (SS) removal efficiency, and infiltration rate change tests were performed on inflow and outflow water. In case of the PSD, the maximum particulate size in the outflow decreased from 64 ㎛ to 33 ㎛ as the operating duration elapsed. The SS removal efficiency improved from 97 % to 99 %. The infiltration rate changed from 0.113 L/sec to 0.015 L/sec during the operation duration. The maintenance timing was determined based on the stormwater runoff requirements with these changes in water quality and infiltration rate. The methodologies in this study could be used to estimate the timing of maintenance of other low impact development techniques.

• 한국조경학회지
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• 제32권2호
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• pp.78-85
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• 2004

To manage rainwater environmentally friendly, it is necessary to let the rainwater be infiltrated naturally and make reservoirs to detain it in the chosen spot. Not only should it be prepared to handle the city flood, but also it be a necessary alternative for establishing the ecological water circular system in cities. Therefore, considering the present rainwater. management system, this study analysed the status of products which can be interchanged from existent systems to rainwater infiltrating systems. In this study, the infiltrating equipment that is applicable to the Korean drainage system was developed. The case was studied out to investigate the effects of infiltrating and the detaining ability of the developed product. The case site, block 6 of Sang-am residence, was selected and analyzed. The amount of infiltration and detention per unit of the introduced facilities, i.e., infiltrating pipes and tanks were calculated. In this research, the amount of each infiltrating tank was revealed to be 1.353 m/hr and the amount of detention as 0.299 m/hr. And the amount of each infiltrating pipe was found to be 0.541 m/hr and the amount of detention was 0.118 m/hr. To examine the effects of the system, the total amount of the outlet before and after installing was compared and calculated. In doing this, a basis for deciding the arrangement and number of tanks and pipes of the infiltrating system was made.

• 토지주택연구
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• 제2권4호
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• pp.503-507
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• 2011

신도시 A에 저탄소 녹색 마을(약 40만$m^2$)을 개발하고자 한다. 저탄소 녹색 마을의 조성을 위해서는 수문 순환의 복원 또는 물순환의 복원은 필수적이다. 저탄소 녹색 마을의 자연계 물순환 복원을 위해 LID-분산형 빗물 관리 시설의 설치를 계획하였다. 물순환에 미치는 영향 분석은 저탄소 녹색마을 개발 이전과 개발 후, 그리고 LID 시설(빗물정원, 인공습지, 빗물이용시설 등)을 설치한 후의 조건에서 EPA에서 개발된 SWMM-LID 모델을 이용하여 수행하였다. 개발 전의 침투 영역의 특성, 개발 후의 상당한 녹지 공간 탓으로, 수문 순환을 복원하기 위한 LID 설치 계획은 뚜렷한 효과를 보여주지 않고 있다. 그러나 LID 시설 설치에 의한 물순환의 가능성을 볼 수는 있었다. 이는 본 연구에서 제시한 LID 시설의 설치 계획이 해당 개발 지역의 물순환을 위해서는 더 확대되어야 함을 의미한다.

• Ecology and Resilient Infrastructure
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• 제3권2호
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• pp.126-129
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• 2016

도시화로 인해 불투수 면적이 증가하면서 지하 침투량이 감소하고 강우 유출량이 증가하여 도시 침수 발생 가능성이 커지고 지하수 고갈 문제를 발생시키고 있다. 본 연구에서는 가로수 주위에 수분 및 영양을 공급할 수 있는 신개념 특수 가로수 보호판의 설치가 도시 내 침투량 개선에 미치는 효과를 평가하고, 시설의 배치에 따른 침투량 변화를 조사하였다. 침투관이 설치된 신개념 가로수 보호판은 토양으로는 빗물 침투량을 증가시키고 지면 위 수위 상승을 억제하였다. 따라서 개발된 신개념 가로수 보호판은 도시 도로변에서 저영향개발 (LID) 시설로서 효과적으로 적용될 수 있을 것으로 판단되었다.

• 국제학술발표논문집
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• The 6th International Conference on Construction Engineering and Project Management
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• pp.54-55
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• 2015

Increase of impervious areas due to expansion of housing area, commercial and business building of urban is resulting in property change of stormwater runoff. Also, rapid urbanization and heavy rain due to climate change lead to urban flood and debris flow damage. In 2010 and 2011, Seoul had experienced shocking flooding damages by heavy rain. All these have led to increased interest in applying LID and decentralized rainwater management as a means of urban hydrologic cycle restoration and Natural Disaster Prevention such as flooding and so on. Urban development is a cause of expansion of impervious area. It reduces infiltration of rain water and may increase runoff volume from storms. Low Impact Development (LID) methods is to mimic the predevelopment site hydrology by using site design techniques that store, infiltrate, evaporate, detain runoff, and reduction flooding. Use of these techniques helps to reduce off-site runoff and ensure adequate groundwater recharge. The contents of this paper include a hydrologic analysis on a site and an evaluation of flooding reduction effect of LID practice facilities planned on the site. The region of this Case study is LID Rainwater Management Demonstration District in A-new town and P-new town, Korea. LID Practice facilities were designed on the area of rainwater management demonstration district in new town. We performed analysis of reduction effect about flood discharge. SWMM5 has been developed as a model to analyze the hydrologic impacts of LID facilities. For this study, we used weather data for around 38 years from January 1973 to August 2014 collected from the new town City Observatory near the district. Using the weather data, we performed continuous simulation of urban runoff in order to analyze impacts on the Stream from the development of the district and the installation of LID facilities. This is a new approach to stormwater management system which is different from existing end-of-pipe type management system. We suggest that LID should be discussed as a efficient method of urban disasters and climate change control in future land use, sewer and stormwater management planning.

• 한국물환경학회지
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• 제36권3호
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• pp.206-219
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• 2020

As urbanization and impermeable areas have increased, stormwater and non-point pollutants entering the stream have increased. Additionally, in the case of the old town comprising a combined sewer pipe system, there is a problem of stream water pollution caused by the combined sewer overflow. To resolve this problem, many cities globally are pursuing an environmentally friendly low impact development strategy that can infiltrate, evaporate, and store rainwater. This study analyzed the expected effects and efficiency when the LID facility was installed as a measure to improve hydrologic cycle and water quality in the Oncheon stream in Busan. The EPA-SWMM, previously calibrated for hydrological and water quality parameters, was used, and standard parameters of the LID facilities supported by the EPA-SWMM were set. Benchmarking the green infrastructure plan in New York City, USA, has created various installation scenarios for the LID facilities in the Oncheon stream drainage area. The installation and maintenance cost of the LID facility for scenarios were estimated, and the effect of each LID facility was analyzed through a long-term EPA-SWMM simulation. Among the applied LID facilities, the infiltration trench showed the best effect, and the bio-retention cell and permeable pavement system followed. Conversely, in terms of cost-efficiency, the permeable pavement systems showed the best efficiency, followed by the infiltration trenches and bio-retention cells.

• KIEAE Journal
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• 제13권1호
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• pp.9-15
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• 2013

This study aims to analyze, by forming an experimental area of artificial soil green area that is of equal scale and analyzing the characteristics of runoff water in accordance with the cross-section configuration, applied the benefits in an actual multi-housing case study complex. In examining the measurement test results of the runoff water infiltration amount and surface runoff amount of a low-profile type green area(Dish type) and a general type green area(Mound type), Dish type was seen to have 1.5-times higher runoff water infiltration amount than Mound type during heavy rainfalls and showed about a 50% reduction with respect to the surface runoff amount. In other words, artificial soil green area offers the benefit of reduction of surface runoff amount and suggests, in actuality even with a change to the cross-sectional configuration of artificial soil green area alone at the time of construction of multi-housings, the possibility of benefits and reduction of costs spent on existing rainwater management facilities.