Applicability of SWMM for semi Urban Catchment Flood modeling using extreme Rainfall Events

Abstract

Urban floods are different type of flooding event as compared to normally occurring riverine floods which is very often seen along the river banks during heavy rainfall in monsoons. Continuous human interventions in natural vegetative land for rapid Urbanization activities has given rise to Urban Flooding. So, there is a need for capacity analysis of existing storm networks and identification of overflow locations is the need of the study. Hence, in the present study an attempt has been made to simulate Urban Flood scenario for a semi Urban catchment using Storm Water Management Model (SWMM). The whole area is divided into 20 sub catchments and the data acquired from 2017 rainfall events is used for modelling. The study area is represented in SWMM by the help of Master Plan AutoCAD maps having drain lines and Reduced Levels (R.L.s) information. From this detailed elevation information of various nodes and length of pipe lines has been estimated to make the schematic view of the study area in SWMM. The focus of the present study is to model runoff conditions using Dynamic wave method of flood routing and Green-Ampt Infiltration model in SWMM. The results showed that SWMM has capability to model and interpret flows at various channel sections and nodes for mitigating floods. Due to unavailability of gauged flow data the model Parameters needs calibration for more reliable results. Model has effectively given catchment responses for peak flow and volume of runoff which is considered as one of the essential components of Urban drainage planning to mitigate the risk of flood.

Research on the Effect of Natural Cisterns on Flooding in Villages in The Plain Area-Take A Village in Shandong Province as An Example

“…The main application fields and directions are: urban drainage system planning, low-impact development research (LID) and water quality simulation, etc. SWMM contains a pipeline network convergence module, so it is often used for simulation drainage system, which is widely used in storm and flood simulation research [7][8][9] . The groundwater module was added to the SWMM model in 1988, making it applicable to rural areas.…”

Analysing Urban Flooding Risk with CMIP5 and CMIP6 Climate Projections

“…The storm water management model (SWMM) has been widely used to study the rainfall runoff of a catchment around the world, including in Europe, North America [44] Asia [45][46][47] and the Middle East [48]. In Beijing, SWMM has been used to study rainfall runoff, optimal management practices, low-impact development, and sponge cities, in addition to other things [7,46,[49][50][51][52].…”

Utilization of Storm Water Management Model for Urban Flood Scenario

“…For computing runoff rate from rainfall, Soil Conservation Service (SCS) curve number (CN) method also can be used [19]. ArcGIS based modeling with the help of Digital Elevation Model, Contour map model was simulated for Krishna Delta Andhra Pradesh [20]. Another attempt was made to estimate the flood and surface runoff with real time through GIS and Remote sensing for Krishna river, here discharge of flood from daily runoff is calculated by depth of runoff obtained from the SCS method [21].…”