An Approach of Travel Time of Flood Peaks and Runoff Model towards Low Impact Development

Abstract

The most crucial point for the planning of the city should be considered flooding conditions. In manipulating the length of the channel, of course also manages the direction of the stream, so that the size of the catchment area in the area will be different. The characteristics of surface runoff of urban drainage systems are essential to determine the effects of runoff reduction towards Low Impact Development (LID). In this study, to make modelling of stormwater runoff characteristics in a city can be analysed by using the Stormwater Management Model (SWMM). This research is to explain the method of approaching travel time of flood peaks and runoff in a drainage network system that needs a rainfall-runoff model, EPA SWMM model that shown flood peak in the return period 5-yr and 10-yr, and need representatives to the graph of travel time and runoff. The result shows that the channel only accommodates return period of flood 5-yr, not the 10-yr. The drainage network system consists of minor drainage and major drainage (river) that can be simulated to reduce the runoff. The approach influenced by the direction of flow and the roughness. These parameters are the vital point to manage the travel time of peak floods. The, by redesign and update the capacity of the channel can reduce the overflow over the nodes (junctions).