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color

Published on Nov 25, 2015

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The everyday water you see contains dissolved minerals and often suspended materials.
Color in water you see around you can be imparted in two ways: dissolved and suspended components. An example of dissolved substances is tannin, which is caused by organic matter coming from leaves, roots, and plant remains.
Suspended material in water bodies may be a result of natural causes and/or human activity.
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(DO), which is a measure of how much oxygen is dissolved in the water - DO can tell us a lot about water quality.
Rapidly moving water, such as in a mountain stream or large river, tends to contain a lot of dissolved oxygen, whereas stagnant water contains less. Bacteria in water can consume oxygen as organic matter decays.
Dissolved oxygen in surface water is used by all forms of aquatic life;
Field and lab meters to measure dissolved oxygen have been around for a long time.
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pH is a measure of how acidic/basic water is. The range goes from 0 - 14, with 7 being neutral. pHs of less than 7 indicate acidity,
pH also determines whether aquatic life can use it. In the case of heavy metals, the degree to which they are soluble determines their toxicity.
pH ranges from 0 to 14, with 7 being neutral. pHs less than 7 are acidic while pHs greater than 7 are alkaline (basic). Normal rainfall has a pH of about 5.6
Since pH can be affected by chemicals in the water, pH is an important indicator of water that is changing chemically.
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Turbidity is the measure of relative clarity of a liquid.
Turbidity makes water cloudy or opaque.
Turbidity can provide food and shelter for pathogens. If not removed. turbidity can promote regrowth of pathogens in the distribution system.
. Although turbidity is not a direct indicator of health risk, numerous studies show a strong relationship between removal of turbidity and removal of protozoa.
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Sediment in rivers can also shorten the lifespan of dams and reservoirs. When a river is dammed and a reservoir is created.
the sediments that used to flow along with the relatively fast-moving river water are, instead, deposited in the reservoir.
Streamflow is measured by making a discharge measurement. Suspended sediment.
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Photo by Dru!

The amount of dissolved calcium and magnesium in water determines its "hardness." Water hardness varies throughout the United States.
Hardness is caused by compounds of calcium and magnesium, and by a variety of other metals.
Softest waters were in parts of New England, the South Atlantic-Gulf States, the Pacific Northwest, and Hawaii. Moderately hard waters were common in many rivers of Alaska and Tennessee, in the Great Lakes region, and the Pacific Northwest. Moderately hard waters were common in many rivers of Alaska and Tennessee, the Great Lakes region.

Temperature exerts a major influence on biological activity and growth. Temperature governs the kinds of organisms that can live in rivers and lakes. Fish, insects, zooplankton, phytoplankton, and other aquatic species all have a preferred temperature range.