우수관로 내 토사 퇴적을 고려한 통수능력 분석

The storm sewer is designed to pass the inflow rate depending on the design frequency smoothly. However, taking a look at the exampleof flooding generated in urban area shows that an increase in the generation and damage of flooding can be often caused by thedeposition of sediment in the sewer. This is a problem in the maintenance of sewers, but this implies that the effect of sediment depositionshould be considered to some degree for the design of a conduit itself in another aspect. Thus, it is necessary to realize designin a direction to reduce flood damage pursuant to it by considering the deposition aspect of sediment in a conduit when designing astorm sewer. This study conducted an analysis on the current storm sewer for the Bujeon stream basin at Busan in order to analyze thedeposition aspect of sediment in a sewer network at an actual urban area and the effect of the generation of flooding damage due tothis. The applicable sewer is a box type, which has appeared to be able to discharge capacity enough to discharge a design rainfallover 30, 50, 80 and 100 years for a duration time such as 60, 120, 180 and 240 minutes when not considering the deposition of soil inthe sewer network. On the other hand, when considering the deposition of sediment in conduit, flooding took place for all the abovedesign rainfall. In addition, as a result of adjusting the slope of the conduit section arbitrarily for the current conduit, it was analyzedthat the deposition of sediment can be reduced and the generation of overflows for the design rainfall applied according to this can bereduced by maximum about 65%. From these analysis results, it appeared as necessary to consider the deposition aspect of sedimentwhen designing a sewer network, and design it in a direction to secure the discharge capacity pursuant to this as much as possible.