These lengths are then marked in VISSIM as low-speed areas, and delays are measured. Locations and lengths of road sections, where ponding happens for the future scenario, are identified using PCSWMM. Sensitivity analysis of VISSIM is performed. Both models are calibrated for an existing situation on rainfall event of August 3, 2013, and then used for prediction of future scenario based on 50-year and 100-year return periods of rainfall. For urban drainage, PCSWMM, and for traffic, VISSIM is used. In this study, loose coupling of two models is done. This study is carried out on a 3-km section of arterial road. The specific objectives are: (1) to calibrate and validate urban hydraulic and traffic micro-simulation models and (2) to model storm water and traffic for future conditions. The main objective of the study is to model the interdisciplinary issues of storm water and its effect on the traffic of Karachi. Like other big cities, Karachi is also facing problems due to lack of traffic management and poor drainage system. Traffic management and drainage system are two vital issues for any metropolitan city.
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