In this essay we will discuss about the water resources of the world. Water resources are sources of water that are useful or potentially useful to humans.
Surface water is naturally replenished by precipitation and naturally lost through discharge to the oceansevaporationevapotranspiration and groundwater recharge. Although the only natural input to any surface water system is precipitation within its watershedthe total quantity of water in that system at any given time is also dependent on many other factors.
These factors include storage capacity in lakes, wetlands and artificial reservoirsthe permeability of the soil beneath these storage bodies, the runoff characteristics of the land in the watershed, the timing of the precipitation and local evaporation rates.
All of these factors also affect the proportions of water loss.
Human activities can have a large and sometimes devastating impact on these factors. Humans often increase storage capacity by constructing reservoirs and decrease it by draining wetlands. Humans often increase runoff quantities and velocities by paving areas and channelizing the stream flow.
The total quantity of water available at any given time is an important consideration. Some human water users have an intermittent need for water.
For example, many farms require large quantities of water in the spring, and no water at all in the winter. To supply such a farm with water, a surface water system may require a Water resoures essays storage capacity to collect water throughout the year and release it in a short period of time.
Other users have a continuous need for water, such as a power plant that requires water for cooling. Water resoures essays, over the long term the average rate of precipitation within a watershed is the upper bound for average consumption of natural surface water from that watershed. Natural surface water can be augmented by importing surface water from another watershed through a canal or pipeline.
It can also be artificially augmented from any of the other sources listed here, however in practice the quantities are negligible. Humans can also cause surface water to be "lost" i.
Brazil is estimated to have the largest supply of fresh water in the world, followed by Russia and Canada. For many rivers in large valleys, this unseen component of flow may greatly exceed the visible flow. The hyporheic zone often forms a dynamic interface between surface water and groundwater from aquifers, exchanging flow between rivers and aquifers that may be fully charged or depleted.
This is especially significant in karst areas where pot-holes and underground rivers are common. Groundwater Relative groundwater travel times in the subsurface Groundwater is fresh water located in the subsurface pore space of soil and rocks. It is also water that is flowing within aquifers below the water table.
Sometimes it is useful to make a distinction between groundwater that is closely associated with surface water and deep groundwater in an aquifer sometimes called " fossil water ".
A shipot is a common water source in Central Ukrainian villages Groundwater can be thought of in the same terms as surface water: The critical difference is that due to its slow rate of turnover, groundwater storage is generally much larger in volume compared to inputs than it is for surface water.
This difference makes it easy for humans to use groundwater unsustainably for a long time without severe consequences. Nevertheless, over the long term the average rate of seepage above a groundwater source is the upper bound for average consumption of water from that source.
The natural input to groundwater is seepage from surface water. The natural outputs from groundwater are springs and seepage to the oceans. If the surface water source is also subject to substantial evaporation, a groundwater source may become saline.
This situation can occur naturally under endorheic bodies of water, or artificially under irrigated farmland. In coastal areas, human use of a groundwater source may cause the direction of seepage to ocean to reverse which can also cause soil salinization.
Humans can also cause groundwater to be "lost" i. Humans can increase the input to a groundwater source by building reservoirs or detention ponds. Iceberg near Newfoundland Several schemes have been proposed to make use of icebergs as a water source, however to date this has only been done for research purposes.
Glacier runoff is considered to be surface water. The Himalayas, which are often called "The Roof of the World", contain some of the most extensive and rough high altitude areas on Earth as well as the greatest area of glaciers and permafrost outside of the poles.
To complicate matters, temperatures there are rising more rapidly than the global average. In Nepal, the temperature has risen by 0.Water resources are water that is used for domestic, agricultural and industrial purposes.
For all these activities fresh water is required. Out of the total water in the world, only % of the water is fresh water.1/5(1). Essay about Water Resources Abstract Water, a basis of survival of all living organisms is also considered as the basic pre-requisite of development.
Being second richest country in water resources, Nepal is gifted by Himalayan ranges in the north with ever flowing snow melted rivers and fresh water springs with huge power of producing energy and fetch out drinking water to the people.
Water resources is also affected by Stalinization resulting from discharge of saline agricultural and mining drainage water to river systems and the increased rate of natural discharge of saline groundwater to surface water resources in irrigated and non irrigated areas.
I believe this will allow the population to grow, at the same time this plan will not eliminate the job and incomes of our fisherman. They may have a smaller income due to the limited ocean fishing grounds but they will remain employed. In this essay we will discuss about the water resources of the world.
Water resources are sources of water that are useful or potentially useful to humans. Uses of water include agricultural, industrial, household, recreational and environmental activities. An essay or paper on The Importance of Water Resources.
Water is singly the most important element to the world as a whole. It is the lifeblood of the environment, essential to the survival of all living things whether it is a plant, an animal or humans (Environment Canada, ).
It is a powerful resource that we cannot afford to live without, so we mu.