Karthikeyan Matheswaran

Postdoctoral Researcher, IWMI Central Asia

Flood hazard modeling to derive parameters for Insurance index

Index development cycle

Site prioritization Rainfall-Runoff model Flood Hazard Model

Index Development

Insurance Product

Insurance index

₹

Economic loss Flood Parameters

= Correlate

To create index

How Much? Long?

Flood Characteristics

Parameters:

Deriving flooding Characteristics / Parameters

• Depth & Duration (DD) – Measured in specific river sections

• In floodplain & land surface: DD – Function of topography

• Measurements – Lumped

• Flood characteristics – Distributed

• Need a system / method to predict DD

Hydrodynamic Model – mathematical representation of flow mechanism in rivers and

flood plain

Mike Flood

Cross sections

Discharge / Water level Upstream

River networks

Longitudinal profile

Discharge / Water level Calibration/Validation

Flood Hazard Model

Digital Elevation Model (DEM)

Depth & Duration over

floodplain/landsurface

Water level @ different river sections

1D

Hyd

rau

lic m

mo

del

2D

Ove

rlan

d f

low

mo

de

l

Input Output Depth / Duration land surface

Parameters Zonation

River Bagmathi River network DEM & Cross section locations

Water Level in Bagmathi for June and August

39

41

43

45

47

49

1993 1995 1997 1999 2001 2003 2005

Wat

er le

vel (

AM

SL)

Year

Water Level in Bagmathi - June

Water level - Hayaghat Water level - Benibad

Danger level - Hayaghat Danger level - Benibad

Average crop coverage area (Ha) in proposed blocks (Kharif) Crop Aurai Katra Gaighat Paddy 11000 11000 11000 Maize 1400 1400 1400 Pulses 630 630 630

Flood Hazard map of Muzzafarpur District

Source: BSDMA, http://bsdma.org/Atlas.aspx

Thank you