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Table 1 Criteria for vulnerable map

From: Flood vulnerable zones in the rural blocks of Thiruvallur district, South India

S.No

Map Layer

Phenomenon

Need

Source

1.

Rainfall

Rainfall - Runoff

Major cause of flooding

Ajin et al. 2013

2.

Drainage Density

Structure of water holding

Major cause of flooding

Setiawan et al. 2017

3.

Elevation

Ground surface Topography

Areas of susceptibility

Ouma and Tateishi 2014

4.

Slope

Rainfall-Runoff-Erosion

Flood wave velocity

Sumedh et al. 2012

5.

Geology

Geology

Result of physical surface processes and the lithology.

Cao et al. 2016

6.

Geomorphology

Physical processes on the earth’s surface that produce different landforms

A geomorphic unit is a composite unit in which each feature has specific characteristics.

Mili and Acharjee 2014

7.

Land use and landcover

Purpose for which land has been put to use.

Indicates the state of current use.

Ajin et al. 2013

8.

Lineaments & Intersection

Zones of structural weakness in the rocks;

Geo Dynamics of flood;

Pareta 2012

9.

Zones of Tectonic Subsidence.

Easy movement of water along weak planes.

Geo Dynamics of flood;

Setiawan et al. 2017

10.

Soil

Infiltration - Runoff

Efficiency of the soil to acts as a sponge and soak up water

Danumah et al. 2016