The Greatest Challenge We Face - Global Water Crisis

Only a tiny fraction, less than 1%, of the Earth's water is considered usable for drinking, with the vast majority being saltwater in oceans and seas. 

Here's a breakdown:

 Total Water : Approximately 71% of the Earth's surface is covered by water.

Saltwater : More than 97% of the Earth's water consists of saltwater found in oceans and seas.

Freshwater : Merely around 3% of the Earth's water is classified as freshwater.

Available Freshwater : From that 3%, a large fraction is trapped in glaciers, ice caps, and deep subterranean sources, providing less than 1% accessible for  drinking, farming and various other purpose 

Public health relies on having safe and readily available water for drinking, household purposes, food production, and recreation. Improved sanitation and water supply, along with enhanced management of water resources, can greatly decrease poverty and boost economic growth in a country.

Water and health :

Cholera, diarrhea, dysentery, hepatitis A, typhoid, and polio are among the illnesses that are spread by 

contaminated water and inadequate sanitation.People are exposed to avoidable health hazards when water and sanitation facilities are either nonexistent, insufficient, or improperly managed.This is especially true in healthcare facilities where inadequate water, sanitation, and hygiene services put both patients and employees at higher risk of infection and illness.Hundreds of millions of people's drinking water is chemically or dangerously contaminated due to inadequate management of urban, industrial, and agricultural wastewater. Arsenic and fluoride are two naturally occurring elements that can have health effects, especially in groundwater. Lead, on the other hand, may be more prevalent in drinking water due to leaching from water supply components that come into contact with it. 

(i). Water Scarcity

• Growing Demand: The global population is increasing, but freshwater resources remain limited.

• Climate Change: Rising temperatures, droughts, and changing rainfall patterns are reducing freshwater availability.

• Overuse & Waste: Agriculture, industries, and households often consume more water than can be replenished.

(ii). Water Pollution

• Industrial Waste: Factories dump chemicals and heavy metals into rivers and lakes.

• Agricultural Runoff: Pesticides and fertilizers contaminate water sources.

• Plastic & Microplastic Pollution: Tiny plastic particles are now found in drinking water worldwide.

• Sewage & Human Waste: In many areas, untreated sewage flows into water bodies, spreading diseases.

(iii). Access to Clean Water

• Developing Countries: Millions lack access to safe drinking water, leading to disease and death.

• Infrastructure Issues: Poor water management and old pipes contribute to contamination.

• Water Privatization: In some areas, corporations control water supplies, making it expensive for poor communities.

(iv). Waterborne Diseases

• Contaminated water causes diseases like cholera, dysentery, typhoid, and diarrhea, which kill thousands daily, especially children.

• Bacteria, viruses, and parasites spread through unsafe drinking water.

Economic and social effects  :

People spend less time and effort gathering water when it comes from better and easier-to-access sources, freeing them up to concentrate on other worthwhile endeavors. By reducing the need for lengthy or dangerous trips to collect and transport water, this can also improve personal safety and reduce musculoskeletal disorders. Better water sources result in lower health costs because people are less likely to get sick, which lowers medical expenses and keeps people economically productive. Access to better water sources can result in greater health, which in turn promotes higher school attendance and has positive long   term implications on children’s future ,as they are particularly susceptible to water borne infection .

Challenges :

To attain universal coverage of basic drinking water services by 2030, historical rates of progress would have to double.It will take a sixfold increase to provide universally accessible, safely administered services.Water delivery systems are already facing difficulties due to urbanization, population expansion,  demographic shifts, climate change, and growing water scarcity. More than 2 billion people reside in waterstressed nations, a situation that is predicted to get worse in  some areas due to population expansion and climate change.Reusing wastewater to extract energy, nutrients, or water is becoming a key tactic.  Wastewater and sludge are utilized extensively around the world, but a large portion of them are used informally and/or without adequate treatment and other controls to guarantee the protection of human and environmental health. If done appropriately safe use of wastewater and sludge can yield multiple benefits, including increased food production, increased resilience to water and nutrient scarcity and greater circularity in the economy. The choices for irrigation and drinking water supplies will keep changing, with a growing dependence on groundwater and other sources, such as wastewater. Rainwater harvesting will fluctuate more due to climate change.To guarantee availability and quality, it will be necessary to enhance the management of all water resources.

GAURAV OJHA

Assistant Professor 

Department Of Mechanical Engineering