• Environmental Engineering Research
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• 제22권4호
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• pp.393-400
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• 2017

One of the big problems facing municipalities is the management and control of urban flooding where urban drainage systems are under growing pressure due to increases in urbanization, population and changes in the climate. Urban flooding causes environmental and infrastructure damage, especially to roads, this damage increasing maintenance costs. The aim of the present study is to develop a decision support tool to identify the performance of storm networks to address future risks associated with climate change in the Middle East region and specifically, illegal sewer connections in the storm networks of Karbala city, Iraq. The storm water management model has been used to simulate Karbala's storm drainage network using continuous hourly rainfall intensity data from 2008 to 2016. The results indicate that the system is sufficient as designed before consideration of extra sewage due to an illegal sewer connection. Due to climate changes in recent years, rainfall intensity has increased reaching 33.54 mm/h, this change led to flooding in 47% of manholes. Illegal sewage will increase flooding in the storm system at this rainfall intensity from between 39% to 52%.

• 한국환경보건학회지
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• 제22권4호
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• pp.33-42
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• 1996

This research is to show the application of runoff model and runoff analysis of urban storm drainage network. the runoff models that were used for this research were RRL, ILLUDAS, and SWMM applicative object basin were Geucknak-chun and Sangmu drainage basin located in Seo-Gu, Kwangju. The runoff analysis employed the design storm that distributed the rainfall intensity according to the return period after the huff's method. The result from the comparative analysis of the three runoff models was as follows The difference of peak runoff by return period was 20-30% at Sangmu drainage area of $3.17 Km^2$, while less than 10% at Geucknak-chun drainage area of $12.7 Km^2$. The peak runoff were similar to all models. At the runoff hydrograph the times between rising and descending points were in the sequence of RRL, ILLUDAS and SWMM, but the peak times were similar to all models. The conveyance coefficient to examine the conveyance of the existing drainage network was 0.94-1.37, which means insecure, in Geucknak-chun drainage basin and 0.69-1.16, which means secure, in sangmu drainage basin.

• 대한토목학회논문집
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• 제26권4B호
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• pp.379-387
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• 2006

본 연구의 목적은 Dual-Drainage 개념에 의한 도시침수해석모형을 개발함에 있으며, 이를 위해 도시지역 배수시스템 해석 모형으로 널리 이용되고 있는 SWMM모형과 월류유량의 전파과정을 계산하는 DEM기반 침수해석모형을 통합하였다. 배수시스템 해석 모형인 SWMM모형의 계산결과를 이용하여 침수해석을 수행하는 연계모형의 경우 월류지점으로부터의 침수진행 과정을 잘 모의할 수 있으나, 월류발생이 끝난 시간에도 지형상의 영향으로 인하여 일부 침수유량이 일부지점에 계속 침수된 채 있는 등 지표침수유량의 배수과정을 제대로 모의하지 못할 수 있다. 이를 해결하기 위해서는 침수지역에 대한 지표류 홍수 추적시 일부 침수유량이 과부하가 발생하지 않는 유입구 지점을 통과함 때 다시 배수시스템으로 유입되는 것을 고려하여 재유입되는 양을 산정하고 유입된 유량은 배수시스템 내의 흐름에 반영되도록 배수시스템과 침수해석모형을 통합한 새로운 모형을 개발하였다, 본 모형을 이용하여 침수상황의 시간별 진행과정을 분석함으로써 도시홍수에 대한 침수위험지점 파악 및 주민대피지도 구축 등에 활용될 수 있을 것으로 판단된다.

• 한국관개배수논문집
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• 제4권2호
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• pp.10-24
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• 1997

This study is to analyse the reliability of storm sewer in urban area by applying the reliability analysis method. Two methods (MVFOSM and AFOSM) are applied to 6 drainage area in Seoul city and risk-safety factor curves are derived. Because risk-safety f

• 상하수도학회지
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• 제23권6호
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• pp.711-717
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• 2009

In this study, SWMM model is used to reproduce the main storm sewer system located in the Nae-Hang drainage basin of the Mokpo city and keep track of flood discharge. Given the outlet of the reaches border the coastline, this paper has taken the dual-drainage approach to perform inundation simulation, considering both the overflows and inflows at the manholes of the sewer system, and at the same time, taking the impacts of tidal stage into consideration. The following conclusions are reached in this study: First, when planning lowland sewer system alongside the coastline or the riverside, the tidal stage or flood stage need to be considered in the planning and design processes. Second, an analysis that fails to consider overflow and inundation at the manholes may overestimate inundation depth of the flooded area. In other words, in order to estimate flood discharge and flood stage in a lowland storm sewer system, it is desirable to analyze the conveyance capacity of storm sewer system and simulate overflow and inundation at the manholes at the same time.

• 한국물환경학회지
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• 제24권2호
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• pp.180-184
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• 2008

A distributed hydrologic model of an urban drainage area on Bugok drainage area in Oncheon stream was developed and combined with a optimization method to determine the optimal location and number of best management practices (BMPs) for storm water runoff reduction. This model is based on the SCS-CN method and integrated with a distributed hydrologic network model of the drainage area using system of 4,211 hydrologic response units (HRUs). Optimal location is found by locating HRU combination that leads to a maximum reduction in peak flow at the drainage outlet in this model. The results of this study indicate the optimal locations and numbers of BMPs, however, for more exact application of this model, project cost and SCS-CN reduction rate of structural facilities such infiltration trench and pervious pavement will have to be considered.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2021년도 학술발표회
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• pp.142-142
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• 2021

An arbitrary representation of an urban drainage sewer system was devised using a geographic information system (GIS) tool in order to calculate the surface and subsurface flow interaction for simulating urban flood. The proposed methodology is a mean to supplement the unavailability of systematized drainage system using high-resolution digital elevation(DEM) data in under-developed countries. A modified DEM was also developed to represent the flood propagation through buildings and road system from digital surface models (DSM) and barely visible streams in digital terrain models (DTM). The manhole, sewer pipe and storm drain parameters are obtained through field validation and followed the guidelines from the Plumbing law of the Philippines. The flow discharge from surface to the devised sewer pipes through the storm drains are calculated. The resulting flood simulation using the modified DEM was validated using the observed flood inundation during a rainfall event. The proposed methodology for constructing a hypothetical drainage system allows parameter adjustments such as size, elevation, location, slope, etc. which permits the flood depth prediction for variable factors the Plumbing law. The research can therefore be employed to simulate urban flood forecasts that can be utilized from traffic advisories to early warning procedures during extreme rainfall events.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2005년도 학술발표회 논문집
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• pp.159-162
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• 2005

도시지역에의 내수범람은 주로 우수관로 배수체계의 통수능력 부족으로 발생된다. 따라서 지금까지의 도시침수에 대한 국내 연구가 우수관로해석에 국한되어왔다. 하지만 우수관로시스템 해석을 통해서 배수능이 부족한 관거를 찾는 것만으로 침수방지대책을 세우는 것은 매우 근사적이고 비합리적인 대안을 제시할 수밖에 없는 실정이다. 본 연구에서는 도시침수양상에 대한 정확하고 합리적인 해를 도출하기 위하여 지표류 해석을 통한 침수해석의 필요성을 제시하였고, 2001년 7월 서울지역의 집중호우 사상에 대한 적용결과로 해석 결과를 검증하였다. 본 연구의 결과는 도시 홍수 예경보와 침수범람도 작성 등의 도시치수 및 방재계획 수립에 실제적으로 응용될 수 있을 것으로 기대된다.

• 한국해안·해양공학회논문집
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• 제26권5호
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• pp.292-299
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• 2014

기존의 태풍에 의한 해안 범람 수치모의 연구의 대부분은 폭풍해일만을 고려하였으므로 강우에 의한 추가적인 침수는 배제되어 왔다. 일반적으로 태풍은 강우를 동반한 자연재해이므로 폭풍해일에 의한 해안 도시범람을 수치모의 하는 데 있어 반드시 강우의 영향이 고려되어야 한다. 또한 강우는 도시 우수 관망을 통해 바다로 배출되므로 강우를 동반하는 폭풍해일 수치모의 시 우수관망 시스템이 고려되어야 타당한 결과를 얻을 수 있다. 본 연구에서는 기존의 폭풍해일 수치모형에 강우와 우수관망을 해석할 수 있는 알고리즘을 추가하여 수치모형을 개발하였다. 개발된 수치모형을 단순화된 지형에 적용하여 강우에 의한 범람과 우수의 배수, 해수의 역류현상, 우수의 배수에 따른 해수면 상승 등 기본적인 수치모형의 기능을 검사하였다. 그 결과 다양한 조건에서 수치모형이 정상적으로 작동되는 것을 확인하였다.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2004년도 학술발표회
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• pp.543-546
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• 2004

Nutrients behavior were investigated at a paddy fields area(Soro-ri) with large-scaled plots on loam soil during irrigation seasons of $2001\~2003$. The average concentration of TN, TDN and TDP in drainage water was higher than that in irrigation water. On the other hand, the average concentration TP in irrigation water was higher than in drainage water. The ratio of TDN to TN accounted (or over $90\%$ and the ratio of TDP to TP accounted for $50\~70\%$. Especially the ratio of TDP to TP in drainage water was higher than that in irrigation water, suggesting that much of particulate component was reduced due to sedimentation and adsorption in paddy fields plots. Overall, particulate phosphorus usually account for 44 to $77\%$ of tile total phosphorus during storm events.