CEIE 340 Lecture 13 Et-WQ-LID

CEIE 340 Lecture 13 Et-WQ-LID - 1 Water Resource...

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Unformatted text preview: 1 Water Resource Engineering CEIE 340 Sayedul H. Choudhury, Ph.D. Evapotranspiration, LID and Water Quality THE HYDROLOGIC CYCLE 2 Evaporation E E Evaporation s Process by which the phase of water is changed from liquid to a vapor. s It occurs at the evaporating surface, the contact between water body and overlaying air. s Standing Water s Soil Moisture s Moisture on Plants s Precipitation 3 Evaporation Rate s Evaporation rate is a function of several meteorological and environmental factors s Factors evaporation rates: s Temperature s Humidity and vapor pressure s Solar radiation s Wind speed s Determined using empirical relationships with climate data s Field Measurement: Pan evaporation Transpiration s Transpiration is the process by which plants transfer water from the root zone to the leaf surface, where it eventually evaporates into atmosphere. s The process by which transpiration takes place can be described as follows: Water is extracted by a plants roots, transported upward through its stem and diffused into the atmosphere through stoma. 4 Factors Affecting Transpiration s Vegetation type s Vegetation density s Vegetation health...
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CEIE 340 Lecture 13 Et-WQ-LID - 1 Water Resource...

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