**2. Data acquisition and analysis**

The study is based on mixed approach. Primary data regarding the depth and spatial extent of flood were acquired in the field using community perception. Similarly, Global Positioning System (GPS) survey was conducted simultaneously to acquire the geolocation of places having different flood depth. Secondary data were collected from concerned government departments. Monthly temperature and rainfall data (2000–2015) and discharge data (1925– 2015) were collected from Pakistan Meteorology Department (PMD). Flood damage data were collected from Provincial Disaster Management Authority (PDMA). The Shuttle Radar Topographic Mission (SRTM) Digital Elevation Model (DEM) having 30 m spatial resolution was downloaded from United States Geological Survey (USGS), which is a open source geodatabase.

Watershed modeling approach was applied to delineate Chenab basin in geographic information system (GIS) environment by using SRTM DEM as input data. Buffer analysis was implemented in GIS environment to delineate the flood minimum and maximum extent. The flood depth was geo-visualized by applying inverse distance weighted (IDW) techniques.

Similarly, descriptive statistical analysis was applied on temperature, rainfall, and discharge data to visualize the temporal trend and past flood events. Maps and tables were used to visualize the results.
