Floods Analysis in Jember Urban Drainage System

Abstract

ntly lo nun n n t Jember urban area shows that an increase in the number of point locations, and the height of puddle. Therefore, traffic congestions, and community activities due to flood innundation in Jember urban area can be disrupted. The purpose of this study was to analyze the causes of flooding in Jember urban area using SWMM. The flood events in three city districts of Jember was evaluated by assessing the intensity of the rainfall, the slope of the land surface, drainage channels, land use, and channel capacity. Based on measurements of the topography (drainage area, slope, and flow direction) was made schematization of the network system consisting the location of raingauges, the sub catchments, junctions, conduits, and outlets. Each object properties required input parameters, such as: elevations, areas, manning roughness values on oveland flow and channels, and the dimensions of the channel. The reliability of the model parameters was determined by calibrating the model, which compares the water level in the channel of the observations with the results of the model output. Furthermore, the causes of the flooding were analyzed through simulation models. The analysis showed that there were 111 noodes flooding. The causes of flooding ie: the channel capacities were not able to accommodate desaign rainfall for 1, 2, 5 or 10 year return period, there were the contribution of water from irrigation drainage, there were the channel bottlenecks, inlet holes were not allow water to enter the drainage channels, and there were sedimentation on the channel.