Factors affecting water availability
There are several reasons why global water supply is not even.
Factors affecting water supply
Access to a fresh water supply is affected by the following factors:
- Climate. Low levels of rainfall and high temperatures lead to A place that has less water than required.. When rainfall is low, there is less water available. When temperatures are high, water evaporates and so there is less available to use. A location that has more water than required. are common where rainfall is high and temperatures are lower.
- Geology. Rainfall flows down to the rocks beneath the ground. Some rocks are A type of rock which allows water to pass through its joints and cracks, eg limestone. and allow water to flow through them. Permeable rocks can lead to less surface water. For example, limestone landscapes often have dry rivers - the rivers only exist when rain has just fallen. Permeable rocks form Naturally occurring underground water stores., which means they are stores of water. 70% of the water supply in the south east of England comes from the chalk aquifer beneath the surface. Other rocks are A substance which fluids are unable to pass through.. These rocks do not hold water, but they can trap it in the layers above.
- Pollution. Some places have plenty of water, but pollution has made it unsafe to use. Untreated Waste organic matter that sometimes pollutes water systems, eg faeces. and waste water from factories cause problems. Where water is stored in rocks beneath the ground. is usually cleaner, although pollutants can travel down into the ground. Gold mining near Johannesburg, South Africa, has led to uranium, arsenic and sulphuric acid polluting streams and rivers.
- The process of extracting too much water.. When water is taken from aquifers, groundwater levels fall. If the amount of water taken is greater than the amount of water falling as rain, it is called over-abstraction. The Sonoran desert in Arizona has experienced over-abstraction as water is taken for irrigation and urbanisation. The land here is A fall in land levels. and water is becoming scarcer.
- Limited The basic structures needed for an area to function, for example roads and communications. . Pipelines are needed to safely move water from place to place. Sealed pipes reduce the potential for leaks and pollution. Some places do not have these pipes in place. They can be expensive to lay, as they need to be buried underground. Water pumps also form part of the water infrastructure. Water pumps in villages across Kenya were recently fitted with An electronic device that produces radio waves. that send text messages if the devices break down.
- Poverty. Nearly 1 billion people in Africa do not have access to clean, safe water. This locks them in a A set of factors which keeps someone in poverty, without hope of an escape. - they cannot afford water so they become ill and when they become ill then cannot work and earn money.
- Politics. Communication needs to take place within countries and across borders. There needs to be cooperation between states for the use of water resources that cross international borders. If, for example, water is polluted in one country then this will affect all other countries downstream.
Water politics, sometimes called hydropolitics, is politics affected by the availability of water resources. The river Nile for example, is the primary water source for both Egypt and Sudan. Classed as an international river, the Nile flows through nine countries before reaching the Mediterranean Sea.
Impacts on water insecurity
Water security is when the entire population of a country has sustainable access to adequate quantities of acceptably clean water. There are several impacts of No reliable access to adequate quantities of acceptably clean water.. Some of these impacts are linked in a cycle of poverty.
- Lack of clean piped water. Many girls across Africa spend hours walking to collect water rather than attending school.
- Diseases spread by contact with infected water.. Drinking or using dirty water puts people at risk of waterborne diseases and illnesses, such as diarrhoea, A potentially fatal disease spread by mosquitoes. and schistosomiasis. Schistosomiasis is a parasitic worm that enters the body through the skin coming into contact with water that contains untreated sewage. It has been reported in 78 countries and 90% of people receiving treatment for it live in Africa.
- Food production. Water insecurity can lead to lower levels of food production. Irrigation can increase crop yields by as much as 400%. Places that do not have enough water to irrigate crops have less food to eat.
- Industrial output. Industry needs water for all stages of production. Water is used as a Basic material that goods are made from such as crops, metals, wood and animal products such as wool and leather., a coolant, a method of transport, and in some cases, a source of energy. Areas that experience water insecurity are unable to operate factories and make products. This leaves them relying on imports, which may be expensive.
- Conflicts. Water is a source of conflict in some parts of the world. Seizing A large concrete wall built to trap water in a reservoir. is a powerful way of controlling water and hydroelectricity supplies.
The Mosul Dam in Iraq
