It is not cost effective to raise the density of catch basins in preparation for heavy rainfall in terms of construction and maintenance. Our researchers have developed the new catch basin for increasing interception capacity of runoff with internal filtration structure. To compare interception capacity of an existing catch basin with the invented catch basin, a hydraulic experiment device with 4% of road gradients and 0.2% of road gradients was constructed. For runoff conditions of 4.4 l/s, 6.7 l/s and 10.4 l/s, capability of runoff and separation capability of debris (sand and leaves) were evaluated. As the main experimental results, the effectiveness of the developed catch basin has been verified with an increase in interception rate of approximately 22% for the runoff of 6.7 l/s as heavy rainfall. However, the results of invented catch basin showed only 4.5% of settlement rate of debris regarding sand. Therefore, the authors proposed an improved tilted screen structure additionally. After reviewing the performance of improved catch basin, application of the invented catch basin is expected to drain runoff effectively when it is applied to the faulty road drainage section.

본 연구에서는 도로의 측구 부분을 수리모형으로 제작하여 빗물받이의 차집능력을 검토하였다. 측구의 유량은 도로의 차선(2-4차선) 및 빗물받이 간격(10-30m)을 고려하여 4-15l/sec의 유량을 사용하였고, 도로의 종방향 경사는 0, 2, 5, 7%를 선택하였으며, 측구의 횡경사는 4, 7, 10%를 사용하였다. 유입부의 규모는 의 4종류를 사용하였으며, 총 실험 횟수는 240회이다. 측구의 횡경사가 클수록 전체적인 빗물받이의 차집유량은 증가하였다.