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10 Cards in this Set
- Front
- Back
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Evaporation |
Continuous natural process by which a substance changes from liquid to gaseous state |
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Dalton law of evaporation |
The rate of evaporation can be related to vapour pressure as E = c (Es - Ea) Or E = (a+bv)(Es-Ea) |
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Factors affecting evaporation loss |
1. Nature of evaporating surface 2. Area of water surface 3. Depth of water in water body 4. Humidity 5. Wind velocity 6. Temperature 7. Atmospheric pressure 8. Quality of water |
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Estimation of evaporation from surfaces of water bodies. |
1. Measurement using evaporating pans 2. Use of empirical equations 3. Water budget method 4. Energy budget method |
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Infiltration |
It is defined as the downward movement of water from the soil mass through the the pores of the soil |
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Infiltration capacity |
It is the maximum rate at which water will enter the soil in a given condition |
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Infiltration rate |
It is the rate at which water actually enters a soil during a storm |
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Infiltration capacity curve |
Graphical representation between variation of infiltration capacity with time during or little after rainfall |
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Factors affecting infiltration |
1. Condition of entry surface 2 . Permeability or percolation of soil formation 3. Antecedent moisture condition of soil 4. Temperature 5. Intensity and duration of rain 6. Movement of man and animals 7. Change due to human activities 8. Quality of water 9. Presence of groundwater 10. Size and characteristics of soil particles 11. Catchment parameters |
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Field measurement of infiltration rate |
1. Single cylindrical or single tube infiltrometer 2. Concentric double cylindrical or double ring infiltrometer |
