Control of environment : water, Science

Water:

We all know  that safe drinking water is essential for good health. Many of  the diseases in our country are  due to lack of supply of safe drinking water. ~nfortunatel~~  only  18% of  the population  in rural area gets reasonably safe drinking water. The vast majority of our rural and urban population depends upon  surface water, i.e. water from rivers, streams, reservoirs, lakes, tanks and ponds, which generally get their water from rain. Although rain water is the purest water in nature, it becomes impure as it passes through the atmosphere or fl,ows on the ground. It gets contaminated with dust, soot, gases and micro-organisms.  Therefore, surface water possesses all this contamination plus additional contamination  due to human activity, such as bathing, washing clothes and utensils, or washing after passing stools. The 'water obtained from wells or tube wells, springs or handpumps is generally superior  to surface water, because this water is filtered through the ground itself and is free of contamination, unless of course the handpump is not deep enough or is too close to e source of  infection. 

Earlier, you have learnt the names of the diseases which are spread through contaminated water. Disease rates are  directly related to the quality of water supply. It has been shown that with the improvement of water supply in  some of  the States  in India, disease rates have bee" drastically lowered. Drinking water must be free of disease-causing agents or harmful chemicals. Human activity pollutes water supply through negligence in disposing faecal matter, sewage, industrial waste, fertilisers, pesticides and radio-active wastes. In  urban areas only a small proportion of our population enjoys the fac 3ty of sewerage system. Over 70%  of the people living in, rural areas defecate in the open  fie%  leading to great hazards in  spreading various bacterial diseases. Proper disposal of huma;.  excreta is an essential quirement of community health. At home, drinking water can be made safe by  filtration and boiling. Filtration removes most of the suspended impyrities. Disease-causing microbes are killed by boiling.  

Posted Date: 9/28/2012 8:23:11 AM | Location : United States







Related Discussions:- Control of environment : water, Assignment Help, Ask Question on Control of environment : water, Get Answer, Expert's Help, Control of environment : water Discussions

Write discussion on Control of environment : water
Your posts are moderated
Related Questions
Heaping water up in a glass Place a drinking glass in a shallow pan or on a saucer. Rub the top edge of the glass with a dry cloth. Pour water into the glass unless it is full

Navigation and Astronomy: As we have said earlier, by  the edd of  the Middle Ages, trade on land and over the seas was being Sken up on a big scale. By  the fifteenth centur

Factors decide the broad area of scientific activity

Explain the Posterior Pituitary The posterior pituitary gland or neurohypophysis is located immediately behind the anterior pituitary gland, as you may have seen in Figure.


Define Procedure for Estimation of Iron in the Solution? Carry out the experiment following the steps enumerated herewith: 1. Weigh 702 mg of reagent grade ferrous ammonium

What makes streams look muddy? After a heavy rainfall have peoples take samples of running muddy water in glass jars. Let the water stand for many hours unless the sediment has

Question: a) Describe wet bulb thermometer and wet bulb temperature. b) What happens to the volume of a rising parcel of air and of a sinking parcel of air? c) What do yo

How to make a receiver for vacuum experiments Secure a large jar with an air-tight screw cap, like as a fruit jar. Drill a hole by the top and have a short metal tube soldered

How to make an overflow can and catch bucket These are useful for the study of Archimedes'  principle, which controls floating and sinking. To make an overflow can secure a tin