In the 1970s, many cities in Korea channelized rivers and streams to efficiently utilize space. However, as the beneficial functions of urban streams were emphasized, projects to restore channelized rivers and streams are now being pursued. To restore channelized rivers, there are many issues that need to be addressed, such as solving transportation problems, obtaining consent from local residents, and managing costs. However, above all else, ensuring a sustainable water supply for the rivers is essential in order to restore their functions. In this study, quantity and water quality surveys were conducted, and a method was proposed to predict the quantity of water available for utilization in channelized urban rivers when aiming to restore them. Minimum required river water quantity was also calculated to maintain the functions of a river, and various alternatives were suggested to secure the insufficient water quantity. According to the research findings, channelized rivers are mostly experiencing deterioration in water quality due to the inflow of wastewater. Therefore, in order to restore them as clean rivers, it is necessary to prioritize the prevention of wastewater inflow as a preliminary step before restoration. Infiltration inflow or groundwater from adjacent areas can be utilized as river maintenance water supply. In many cases, daylighting channelized rivers is expected to result in insufficient water supply for river maintenance. Therefore, it is necessary to secure water sources that align with the geographical characteristics of the target river. This can be achieved through measures such as wastewater treatment plant effluent reuse, construction of small-scale reservoirs, and utilization of subway discharge water.
Urban streams are increasing the number of naturally eco-friendly spaces in the city center, minimizing the problems of covered streams, and providing a comfortable environment for citizens are all important considerations. But it's not a problem that you can easily think of the restore problem. There are too many things to consider when restoring a restored stream. first, Since most of the superstructure part of the covered stream is used as residential and commercial facilities for citizens, there are problems to be solved through communication with residents, such as evacuation measures for residents, damage compensation, and compensation for private land during restoration. Secondly, as traffic dispersion measures, related to the first point, open the upper road of the covered stream, so an alternative road design is absolutely necessary according to the traffic volume of the covered stream.
Thirdly, the sewage separation and borrowing method, most of the closed streams are in the form of a combined type in which the sewage and rainwater are borrowed and discharged. When restoring streams, it is necessary to separate sewage and stream water for stream management and to develop water quality improvement plans. Fourthly, the problem of dryness measures to secure stream maintenance water, among the problems of covered streams,
If the stream is dry and the water is not used, the scenery, ecosystem, pollution level and various problems of the stream are increased. In order to restore these covered streams, the minimum amount of flow that the stream should have must be secured. In fact, studies on stream maintenance water are being conducted, and it is considered a very important factor when restoring covered streams.
As the stream becomes dry and there is no water for stream use, there will be some problems such as the increase of stream landscape, ecological system and pollution degree. In order to restore such coverd streams, the flow that the stream must keep to a minimum must be ensured.
Research on stream maintenance water is actually progressing, and it has been selected as a very important factor when restoring covered streams. A final issue to consider is the difficulty of securing budgets, as project costs are expected to be high to resolve all of the above considerations.
In this study, among the many covered streams in korea, among the tributaries of the ○○stream in ○○City, we analyzed the current situation of the covered streams, and utilized the analysis results to estimate the minimum stream maintenance required for restoration of the coverd stream.
In this study, among many covered streams in Korea, the current state of the covered streams among the tributary streams of the ○○Stream in ○○City was analyzed, and the minimum amount of water required for restoration of the covered streams was studied using the analysis results. As for the research method, continuous measurement was carried out over a long period of time rather than a short period using a water level gauge, and water quality and soil quality were divided into rainy and non-rainy periods and field surveys were conducted.
The A-stream, B-stream, C-stream, and D-stream points were investigated for the covered streams of the ○○Stream, and as a result of the study, the current available water volume of the A-stream was 43,000m³/day, and the required minimum stream maintenance water volume was 35,000m³/day
It was calculated as m³/day. The B-stream has 10,000m³/day of available water, and the minimum water capacity of the stream is 17,000m³/day. and C-stream was 2,600m³/day of available water and 21,000m³/day of minimum stream maintenance water. and D-stream was 2,900m³/day of available water and 3,100m³/day of minimum stream maintenance water Most streams require additional stream maintenance water, and even when the available water is sufficient, such as the A-stream, there are water quality problems, so it is considered that a lot of additional research is needed for restoration.