Surface Water

Surface Water is water that collects on the ground or in a stream, river, lake, wetland, or ocean.  <<<...return

However, we are not covering salt water at this point, so let’s continue with fresh water. Surface water is naturally replenished by precipitation in the form of rain and snow and also from groundwater.

Water carried in streams is often considered to consist of: a baseflow fraction which is made up of subsurface and ground water that infiltrates into the channel and a direct runoff fraction which enters the drainage system during and soon after precipitation and/or snowmelt periods.

The direct runoff presumably has had minimal to no residence time in the ground water reservoir and only short contact with soil or vegetation. Reactions in the soil/vegetation zone, however, are commonly extensive enough that the direct runoff has considerably higher chemical concentrations than the original rain or snow. Since the baseflow still has greater dissolved solids content, the solute concentration of stream water tends to be inversely related to flow rate. At very high flow rates, the water concentrations may be very dilute.

In addition to mixing of ground water and runoff, other natural factors that influence stream composition include reactions of water with mineral solids in the stream bed and in suspension, reactions among solutes, losses of water by evaporation, losses by transpiration from plants growing in and near the stream, and effects of water dwelling biota. This latter set of natural factors results in fluctuations of composition that bear little relation to discharge rates.

Physical Water Quality Paramenters  <<<...return
Ground Water
Surface Water

Next Topics…
Lake and Reservoir Water
Water Drainage Basin
Water Temperature
Water Color Odor Taste
Water Turbidity
Water Sediment and Particulates

Go Back to:
Physical Water Quality
Chemical Water Quality
Biological Water Quality
Water Basics 101



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