Electrical Conductivity (EC) 11. What does Electrical Conductivity (EC) measure?

Question

Electrical Conductivity (EC) 11. What does Electrical Conductivity (EC) measure? 12. What factors typically control the EC of a stream or water body: a) b) d) c) 13. Lake Mead is one of the largest-capacity reservoirs in the United States with a surface area of 247 sq mi and a maximum depth of 589 ft. Lake Tahoe has a surface area of 193 sq. mi. and an average depth of 989 ft. a) Complete the following including units of measurement: Total Dissolved Solids (TDS) Water Body Electrical Conductivity (EC Lake Mead Lake Tahoc Revised: August 7, 2010

Explanation / Answer

11. Electrical conductivity, the reciprocal of electrical resistivity, is the ability of a material to conduct electrical conductivity. Its SI unit is Siemens/metre.

12. Factors which affect the EC of a stream or a water body: Temperature, Salinity, TDS, Water flow and water level, Stratification.

15. Thermal pollution of water causes considerable environmental impacts. Water is used as a coolant by thermal power plants and industries. The resultant hot water, when released by the industries and power plants, causes decrease in oxygen supply due to sudden decrease in temperature. Decrease in oxygen supply causes change in ecosystem and ecosystem composition.

16. Discharge (of stream) refers to the flow rate of water of a given volume through a given cross-sectional area. Discharge composition= Water + Biological materials + Dissolved chemical constitutents + Suspended solids.

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