• Journal of Wetlands Research
• /
• v.20 no.3
• /
• pp.219-226
• /
• 2018

Interceptor sewer is installed underground near to the river side mostly ofstate-owned land and the management efficiency of public sewage disposal facilities is decreasing as too much infiltration/inflow(I/I) and river flow to interceptor sewer are caused by broken or deteriorated sewer. This also affects the sewer pipeline project and decreases its efficiency. Therefore, the aim of this study is to investigate interceptor sewer which has influence on the reduction of the project effect. The investigation were performed for three study areas. The study includes the investigation of current condition of interceptor sewer(sewer extension, pipe diameter, pipe type, installed year, installed locations, etc), investigation of inside of sewer by CCTV accompanied by pumping and dredging works where required, investigation of inside of manholes by eyes, calculation of pollutant load using the results of investigation of flow quantity and quality. Multipoint investigations were simultaneously performed for flow quantity at confluence area and other investigations were also performed for flow quantity and BOD for interceptor sewer and comparison of pollutant load, investigation of infiltration/inflow(I/I) caused by deterioration of interceptor sewer. As the result of the study, a main reason for reduced effect of sewer pipe improvement project was analyzed as the low-density sewage and I/I in public seweage treatment Facility due to deteriorated and unmanaged interceptor sewers.

• Journal of Korean Society of Environmental Engineers
• /
• v.36 no.12
• /
• pp.813-820
• /
• 2014

In this study, the characteristics of water quality change of the three streams in Daejeon were analyzed according to the expanded installation of interceptors and wastewater treatment plant (WTP). Gabcheon 5 (Singu Bridge) location showed the maximum difference of the highest and lowest concentrations in the last decade. However, the recent water quality of this location was worse than other locations, because of the impact of the effluent from the WTP. In the upstream of the WTP, the Daejeon stream was relatively better than the other locations in organic pollution reduction, and this was caused by the investment for the management of the interceptors in three streams of Daejeon. According to the water quality standard of the stream water quality, the recent water quality of the three streams in Daejeon was acceptable within them in the most of the water quality items, but because the total phosphorus concentration of the upstream such as Daejeon stream, Yudeng stream, Gabchen 3 location did not reach the standard values, a better management of the interceptor was required in the upstream of WTP than its downstream. The upstream of WTP also required a better management of the interceptor than the downstream. The operation and management of WTP was required a high efficiency because the water quality of the effluent from the WTP incurred an adverse effect to the target water quality in the location of the total water pollution load management system.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2005.05b
• /
• pp.497-501
• /
• 2005

근래 들어 도시화로 인한 물순환 파괴를 근본적으로 연구하고 이를 정상화하기 위한 체계적이고 통합적인 유역관리 기술이 요구되고 있다. 유역통합관리의 이론을 실제로 적용한 계획을 세우기 위해서는 Heathcote(1998)가 제안한 다음과 같은 단계별 절차를 수행하는 것이 바람직하다. 단계별 절차는 (1) 대상유역에 대한 정보수집, (2) 문제점 도출, (3) 분명한 목적 수립, (4) 대안의 구성, (5) 대안의 검토, (6) 대안의 효과분석, (7) 최종계획 수립으로 이루어져 있으며 본 연구에서는 3단계의 과정에 해당된다. Heathcote(1998)는 대안의 선정과 평가를 위한 방법으로 단순평가방법(simple assessment method)과 세부평가방법(detailed assessment method)으로 구분하였는데 본 연구에서 수행한 내용은 단순평가방법에 해당된다. 본 연구는 안양천 유역에서 물순환 건전화의 핵심을 건천화 방지로 판단하고 이를 위한 대안을 크게 지표수, 지하수, 대체수자원 분야로 구분하여 제시하였다. 지표수 분야의 경우 구조적인 대안으로 소규모 저수지의 개발, 타유역에서의 도수, 보를 이용한 수량 확보, 우오수분리벽을 이용한 상류유출수의 확보, 저협수로 형성, 하천바닥에 차집관로 매설 방지 및 차집관로 유지관리 등이 있으며 비구조적인 대안으로는 기존 저수지의 유지용수 공급을 위한 운영, 유수지의 다목적 활용, 하천수 직접취수 제한 등이 있다. 지하수 분야의 대안으로는 지하철 용출수의 재이용, 지하수의 과다이용 제한, 침투증진시설의 설치 등이 있으며 대체수자원 분야의 대안으로는 하수처리수를 고도처리하여 유지용수로 재이용하는 것, 중소규모 하수처리장의 상류 설치, 대규모 사업장의 폐수를 고도처리하여 활용하는 것, 상수도의 이용 등이 있다. 이러한 여러 가지 대안들은 Walesh(1989)가 제안한 절차에 따라 기술가능성(technical feasibility), 경제성(economical efficiency), 환경성(environmental feasibility) 등을 정성적으로(qualitatively) 파악하여 실현가능한 대안을 선정하였다. 이렇게 선정된 대안들은 중유역별로 검토하여 효과가 있을 것으로 판단되는 대안들을 제시하는 예비타당성(Prefeasibility) 계획을 수립하였다. 이렇게 제시된 계획은 향후 과학적인 분석(세부평가방법)을 통해 대안을 평가하고 구체적인 타당성(feasibility) 계획을 수립하는데 토대가 될 것이다.

• Journal of Korea Water Resources Association
• /
• v.49 no.10
• /
• pp.851-861
• /
• 2016

Recently, natural disasters, which are hard to predict and prevent, are rapidly increasing due to climate change worldwide. Particularly the damage scale of urban areas is increasing because of local torrential rainfall. In urban areas, the rain water cannot flow to pipes well due to the high percentage of impervious areas by the indiscriminate development. As a result, the inundation damage is getting higher in urban areas. So we need to characterize the interception of the grate inlets to ensure good drainage in impervious areas. But Korean installation criteria of grate inlets does not reflect road and drainage sector characteristics so the grate inlets do not function properly in many areas. In this study, we suggest the interception capacity equations about grate inlets through hydraulic experiments in various conditions. Therefore, the interception capacity changes are analyzed according to bearing bar slopes of grate inlets, grate inlet sizes and shapes and connecting pipe numbers. Though this, we developed the interception capacity equations about domestic grate inlets.

• Journal of Wetlands Research
• /
• v.10 no.2
• /
• pp.129-141
• /
• 2008

This study analyzed and assessed the water quality of a small urban stream in the apartment complex of Yewol-Dong, Buchun-Si at Korea. The flows in the stream due to the interceptions of sewage and normal flow are usually low and the water quality and offensive odor problems by inflows of the sewage and other pollutants are occurred in the study area. Therefore we intended to monitor and identify the water quality conditions. Based on this, we simulated water quality using QUAL2E model and investigated water quality characteristics for the future. As the results, we found that the water quality depended on the inflows of point and non-point sources and so it is important to maintain instream flow for improvement of water quality problem and to intercept point and non-point sources in this study area.

• Journal of Wetlands Research
• /
• v.12 no.3
• /
• pp.15-20
• /
• 2010

The contamination loadings generated in Changwon City are coming into Masan Bay through the Bongam tidal flat except the loadings collected and transferred by sewer lines to the wastewater treatment plant. The recovery of waterbirds, shellfishes, and fishes has been quite well recognized in recent years after the first implementation of Masan Bay TPLM (Total Pollution Loads Management) in Korea. This tidal flat has been conserved by the cooperation of several stakeholders and utilized as an ecosystem field site for in situ education. A large industrial complex has been operated since 1970's, therefore increasing the level of pollutants in estuary and costal sediments, especially by heavy metals. Zinc, copper, and lesd contamination of sediment was revealed at higher level by Clean-up guideline (MOMAF) or heavily polluted level by SQC (USEPA). There was a significant difference between two sites at the 95% confidence level, which implies no homogeneity in the processes of transport and deposition even at 500 m of distance. The heavy metal concentrations in the Bongam sediments have been gradually decreased with comparing the data of 2006, and 2009.

• Journal of Soil and Groundwater Environment
• /
• v.22 no.2
• /
• pp.10-16
• /
• 2017

Recently, the gap between demand and supply of natural aggregate has increased owing to the depletion of aggregate sources. Therefore, policy support is necessary for the stable supply of aggregate resources. Public and construction works experience problems when they do not receive a steady supply of aggregate. Further, instabilities in aggregate supply lead to increases in aggregate prices, and consequently construction costs. As a result, the likelihood of poor construction using low-grade aggregate increases. It is therefore crucial to put measures in place that deal with these issues. This study aims to reduce the load imposed by aggregate use on the environment by recycling soil dredged from sewage ducts to reduce the gap between supply and demand of fine aggregate. The dredged soil is assessed using an applicability test for quality characteristics and solidification with basic properties. This study aims to secure the safety of dredging soil and solidified objects through interior physical and chemical analyses and to utilize it as a base material for concrete solidification in the future.

• 한국방재학회:학술대회논문집
• /
• 2011.02a
• /
• pp.180-180
• /
• 2011

도시지역에서 빗물은 대부분 도로를 통해 이동하고 배수된다. 도로의 배수시설은 도로면의 안전을 확보하기 위한 목적뿐만 아니라 도로 이외의 지역에 흐르는 유출수의 배수를 위한 기능도 포함하고 있다. 그러나 도로변에 설치되어 있는 빗물받이 등과 같은 하수도 시설을 통해 빗물이 원활하게 배수되지 않으면 노면수가 정체되고, 이 노면수가 인근 주택가로 유입되어 침수를 피해를 가중시키는 경우도 있다. 빗물받이 설계 시 설계빈도를 차집능력에 상위하는 충분한 여유를 두고 설치하더라도 빗물받이가 도시지역에서 발생하는 유송토사, 쓰레기, 낙엽 및 담배꽁초 등에 의하여 막히게 되면 유입구의 순 면적이 감소하게 되어 빗물받이가 제 기능을 다하지 못하는 경우 또한 발생하고 있다. 이렇게 빗물받이로 유입되는 부유잡물들은 퇴적되어, 우수관로 내에서 썩어 수질을 악화시키거나 악취의 원인이 되기도 한다. 본 연구에서는 빗물받이의 이 같은 문제점을 개선할 수 있는 비노출 배수로의 배수효율을 수리실험을 통해 검토하였다. 도로의 측면에 비노출 배수로를 설치하였을 경우 도로위에 수심이 거의 발생하지 않으면서 배출할 수 있는 최대 유량은 1.67 l/s였고, 서울시를 기준으로 설계빈도 10년에 대하여 본 연구의 실험도로 규격에서의 유출량이 1.09 l/s임을 고려할 때 10년 빈도 강우강도 발생 시 비노출 배수로가 충분한 여유를 가지고 배수 시킬 수 있을 것으로 판단된다. 본 실험도로의 규격에서 1.67 l/s의 유출량이 발생하기 위한 강우강도는 서울시를 기준으로 100년 빈도에 상응하는 강우강도로 비노출 배수로에 막힘이 없는 경우 100년 빈도의 강우시에도 노면수 배출이 가능하였다. 쓰레기와 모래와 같은 부유잡물이 배수로를 막고 있다 하더라고 배수효율 저하는 크게 발생하지 않았다. 그러나 흙탕물이 유입되는 경우 흙탕물이 배수로의 공극을 차단하는 현상이 나타났고 이는 도로위의 수심은 증가시켰다. 흙탕물이 유입된 후 배출가능 유량을 강우강도와 빈도를 환산한 결과 서울시를 기준으로 6.8년에 상응하였다. 따라서 흙탕물 유입가능성이 높은 도로에 비노출 배수로를 설치하게 되는 경우 배수로의 효율이 낮아지는 것에 대한 대책이 필요하고, 철저한 관리가 요구된다. 이러한 문제점을 해결하기 위해 비노출 배수로의 채움재를 개선하고 동일실험 수행을 계획 중이며, 비점오염물의 제거효율 또한 검토할 예정이다.

• Journal of Korea Water Resources Association
• /
• v.31 no.6
• /
• pp.709-725
• /
• 1998

The characteristics of storm and water quality are investigated based on the measuring data of the test river, the Hongje. the water quality of the test river is generally good comparing to other urban rivers in Seoul, because of the interception of sewer flow. But this system makes the river dry up for 3-4 months in winter. On the other hand, in rainy period the storm from the combined sewer system causes rapid increasing pollutants loads. In order to simulate the urban storm and water quality of the trest basin, the models such as SWMM, ILLUDAS, STORM, HEC-1 were applied and the results are compared in its applicability and accuracy aspects. All models discussed here have shown good results and it seems that SUMM is the most effective model in simulating both quantity and quality. Also, regression relations between the water quantity and quality were derived and their applicabilities were discussed. This regression model is a simple effective tool for estimating the pollutant loads in the rainy period, but if the amount of discharge is bigger than measuring range of raw data, the accuracy becomes poor. This model could be supplemented by expanding the range of collecting data and introducing the river characteristics. The HEC-1 would be anther effective model to simulate storm runoff of a river basin including urban area.

• Journal of Wetlands Research
• /
• v.9 no.3
• /
• pp.25-34
• /
• 2007

We analyzed flood runoff and flood characteristics of an small urban river basin which is in an apartment complex in Yewol-Dong, Buchun-Si, Gyunggi-Do. This discharge normally flows a little by intercepting sewer and interception of pollutants. However in flood period it looks like risk of flood damage by high flood discharge and increase of flood elevation. After appling the analysis model on urban runoff, using the GIS data and cross section at the basin, and then we studied the degree of flood control safety at the basin through forecasting flood elevation. Eventually, there are the flood risks from the River structure for Multi-functional Urban river as well as the river safety. As flood runoff analysis in urban, we need to consider risks which are drainage depth and other.