write a short note on improvement in water
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Drinking water, also known as potable water, is water that is safe to drink or to use for food preparation. The amount of drinking water required to maintain good health varies, and depends on physical activity level, age, health-related issues, and environmental conditions.[1] Americans, on average, drink one litre of water per day and 95% drink less than three litres per day.[2] For those who work in a hot climate, up to 16 litres a day may be required.[1] Liquid water, along with air pressure, nutrients, and solar energy, is essential for life.[1]
Typically in developed countries, tap water meets drinking water quality standards, even though only a small proportion is actually consumed or used in food preparation. Other typical uses include washing, toilets, and irrigation. Greywater may also be used for toilets or irrigation. Its use for irrigation however may be associated with risks.[3] Water may also be unacceptable due to levels of toxins or suspended solids.
Globally, by 2015, 89% of people had access to water from a source that is suitable for drinking – called improved water source.[3] In Sub-Saharan Africa, access to potable water ranged from 40% to 80% of the population. Nearly 4.2 billion people worldwide had access to tap water, while another 2.4 billion had access to wells or public taps.[3] The World Health Organization considers access to safe drinking-water a basic human right.
About 1 to 2 billion people lack safe drinking water,[4] a problem that causes 30,000 deaths each week.[5] More people die from unsafe water than from war,
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_________________Improvement in water_____________
Fish resources are of two types:
(a) Fresh water resources such as canals, ponds, reservoirs and rivers.
(b) Brackish water resources (where sea water and fresh water mix together) such as estuaries and lagoons.
• More extensive fish farming can be done in composite fish culture systems. Both local and imported fish species are used in such systems.
In such a system, a combination of five or six species is used in a single fish pond. These species are selected so that they do not compete for food among them having different types of food habits. As a result, the food available in all parts of the pond is used.