Assessment of the stormwater drainage engineering in expressway design a hydrologic and hydrodynamic analysis of colombo-katunayake expressway using hydrodynamic modelling

Abstract

Road designs need to forecast the hydrologic system performance in order to implement effective solutions for proper stormwater management. Field assessment and hydrologic analysis were carried out in Kalu Oya catchment (54.5 hn2) for the input data requirement of the hydrodynamic model. A satisfactory hydrodynamic model was developed using HEC-RAS with a calibration error of 55% and a verification error of 46%. Verified model was used to sensitivity analysis and management scenario modeling for achieving optimum expressway and hydrologic design.