Modern hydrological science can be said to have begun with the rational method for predicting peak discharge. It was Sherman's unit hydrograph concept that rationalized this method by proposing to consider runoff generation and routing as two distinct processes. The Soil Conservation Service (SCS) approach epitomized the unit hydrograph concept by considering soil as the main mediator of rainfall-runoff generation processes. The soil-centric paradigm, however, has left many unaddressed puzzles because of several reasons including parameter interaction. The main objective of this talk is to underscore the need for a new paradigm and argue that adopting a climate-centric viewpoint could advance rainfall-runoff modelling further.

About the speaker: Mr. Sharjad A J is currently working as a Senior Applications Engineer at COMSOL Multiphysics with 4+ years of experience in CFD, heat transfer, structural mechanics, and Multiphysics simulations. Previously worked as an Assistant Professor in the Aeronautical Engineering department. Skilled in developing advanced simulation workflows, supporting customers, and creating validated technical models across aerodynamics, turbomachinery, and thermo-fluid systems. Published multiple papers in reputed international journals and conferences, and currently serves as a reviewer for Aerospace Science and Technology (Elsevier).

The talk will focus on Natural Catastrophe (NatCat) modelling and its role in quantifying risk and uncertainty associated with hazards such as earthquakes, cyclones, and floods. The lecture will cover hazard, vulnerability, exposure, and financial frameworks, with emphasis on geotechnical effects, probabilistic loss estimation, and real-world case studies. Dr. Vipin is a specialist in natural catastrophe modelling with over a decade of experience in probabilistic hazard and loss modelling across multiple perils. He currently leads the Natural Catastrophe Centre of Excellence at Swiss Re and has extensive experience bridging scientific modelling with industry applications.