The development of essential services including water and sanitation in many megacities of the economically developing countries of Asia cannot keep pace with their rapidly growing population and accompanying urban and industrial development.
The inadequate water supply and poor sanitation services lead to contamination of their water supply.
It also leads to the input of sewage water into the groundwater.
The problem is seriously acute in Karachi, the largest city in Pakistan with a population of over 12 million and growing at 6 percent.
This paper examines the problem of water contamination in Karachi.
The paper presents the data on water quality from various sources, mainly municipal water supply, vendors and well water ; the three major sources of water for domestic use in Karachi.
Except municipal water from some areas and during certain periods, water from most other sources contain coliform bacteria, and in many cases faecal coliform, in amounts several magnitudes higher than any standards permit.
Many samples have also been found to contain heavy metals including Chromium, Lead, Nickel and Arsenic in amounts excessive of permitted standards.
The probable sources of contaminants for the various types of water (piped, vendors, wells) indicate that groundwater may be the main contributor.
The very source of this groundwater is predominantly from sewage.
The health hazards from consuming such contaminated water are obvious. (...)
Mots-clés Pascal : Approvisionnement eau, Gestion ressource eau, Zone urbaine, Pakistan, Asie, Pollution eau, Eau ménagère, Eau souterraine, Réalimentation nappe
Mots-clés Pascal anglais : Water supply, Water resource management, Urban area, Pakistan, Asia, Water pollution, Domestic water, Ground water, Aquifer recharge
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 97-0365837
Code Inist : 001D16A02. Création : 12/09/1997.