Chennai Current Affairs - 2020

Mumbai: 60th most Expensive in the world

According to the Mercer’s 2020 Cost of Living Survey, Mumbai is the 60th most expensive city in the world. Also, it is the 19th most expensive in Asia.

The survey measured its ranking including 209 cities. The measures used to rank the cities were housing, food, transportation, clothing, entertainment and household goods.


The Mercer’s 2020 Cost of Living Survey says that Mumbai is the most expensive city in India. Amongst the other Indian cities, Mumbai was followed by New Delhi at 101st position and then by Chennai at 143rd position globally.

The other least expensive cities include Bengaluru (171) and Kolkata at 185.

Key findings of the Survey

The Survey says that the Indian cities showed an overall jump in rankings. New Delhi climbed 17 positions escaping the title of one of the 100 most expensive cities in the world.

Global Findings

The global list created by the survey was topped by Hong Kong, followed by Ashgabat in Turkmenistan. The third position was retained by Tokyo of Japan and Zurich of Switzerland as that of the previous year. New York was at 6th position, Shanghai of China was at seventh. Bern and Geneva of Switzerland were at eighth and ninth positions respectively. Beijing was at tenth position.

‘Red Atlas Action Plan Map’ unveiled for flood mitigation in Chennai

Vice-President M Venkaiah Naidu unveiled the ‘Red Atlas Action Plan Map’ atlas and the ‘Coastal Flood Warning System App (CFLOWS-Chennai)’ for flood mitigation in Chennai, Tamil Nadu. Both the atlas and the CFLOWS-Chennai are intended as decision support systems covering aspects, including preparedness and prevention. Such initiatives to effectively tackle urban flooding are likely to be replicated in other Indian cities including Mumbai, Maharashtra.

What is Red Atlas Action Plan Map?

It is a first of its kind ready reckoner map, prepared by Union Ministry of Earth Sciences to aid state government of Tamil Nadu in effective flood mitigation in Chennai which witnessed the worst deluge in 2015.

The atlas is aimed at flood mitigation, preparedness, operations and management aspects. The manual besides showcasing the probable scenarios for different rainfall periods also provides information on corporation wards that are likely to be affected due to flooding, and the areas that may need evacuation in Chennai by taking into account all historical datasets.

The over 200-page atlas was prepared by the India Meteorological Department (IMD), National Centre for Coastal Research (NCCR) and National Centre for Medium Range Weather Forecasting (NCMRWF) in association with TN State Disaster Management Authority (SDMA) and Greater Chennai Corporation. Also, the office of the Principal Scientific Advisor (PSA) to Centre government, IIT-Bombay, IIT Madras and Institute of Remote Sensing of Anna University participated from the academia.

What is ‘Coastal Flood Warning System App (CFLOWS-Chennai)’?

The CFLOWS-Chennai is a complete webGIS-based decision support system. It can be used both for mitigation planning operations before flooding as well as in real time to for aspects like relief work.

CFLOWS is an integrated system that involves coupling models of regional weather forecasts, storm surges and captures about 796 flood scenarios.