Water

River,lakes or ponds are one of the necessary sources for potable water..The quality of river,lakes or ponds thus very important..One big problem on them is Sedimentation..And Eutrafication..

First,i will try to tell what is Sedimentaion and the relation with eutrafication..

Sediment is an independent, dynamic body of nature that acquires properties in accordance with the forces that act upon it.Sediment material may be defined as the material components within soil resulting from distinct mineralogical and chemical properties from certain inheritance factors..

Sediment is developed by organic and inorganic materials.. 1-)Organic Development Of Sediment

Sediments are composed of two broad groups of materials, which can be termed organic matter and mineral material. ... Sediment properties result from certain physical and chemical reactions that are conditioned not only by the rocks or rock materials from which soils are derived, but also by the factors of climate, vegetation, topography, and time of reaction. ... In some humid tropical soils, however, the bulk of the sediment is made up of secondary minerals such as hydrated iron and aluminum oxides or kaolinitic clay. ... With unimportant exceptions, these plants are the only organisms living on the land that are able to produce from sunlight, carbon dioxide, water, and the soluble minerals present in sediment, those organic substances which form the basis of life and constitute the mass of all living matter. Sediment organic matter includes the residues of dead plant and animal tissue together with such macro organisms and microorganisms as are discovered within the soil profile. The organic matter of the sediment is not merely plant residue from the soil; it reflects the activity of the microorganisms as well as their residue..

2-)Inorganic Development Of Sediment

The volume of inorganic soil material is composed of four elements; namely, oxygen, silicon, aluminum, and iron. The quantity connection of these elements is similar to that suggested for the average chemical composition of sediment. ... In addition, total analysis of such sediments for manganese, phosphorus, and sulfur generally reveal that the combined oxides of these elements make up less than 0.5 percent of sediment components..

Carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus are nutritive. Sulfur and phosphorus may also function as regulatory elements together with potassium, calcium, and others.In river or ponds especially phosphorus is the nutriative supplement for blue-green algae..If there are excess amount of phosphorus,this situation lead them to grow too much..If they find something to eat too much they reproduce too much and then the pond is green now because of blue green algae..After this circulation(eat,grow,reproduce)the growth point of algae started to fructured..And finally the death of them in lake which seems brown in color in pond and this process is called "eutrafication"which means "too much fed" in Latin..And eutrafication is contained within sediment..That will means sediments element will let eutrafiction to occur..Because of this there are some targets in water and waste water treatment which is Phosphorus removel..