IntroHydroLecture_2_2012

IntroHydroLecture_2_2012 - Water Balance Equation can be...

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1 Hydrologic Equation or Water-Balance Equation Conservation of Mass Amount In – Amount Out = Change in Storage I – Q = S Water Balance Equation can be applied to: • Conservative properties: mass, energy, momentum A defined time period: seconds minutes A defined time period: seconds, minutes, day, year, decade • A defined control volume: pore space to an entire watershed Assumption of Water-Balance Equation Mass density of water is conserved. In most hydrological situations this is valid. Situations where this assumption is not valid: 1) Lakes in cold regions that experience freeze-thaw; 2) Deep regional groundwater flow systems where geothermal heat flow can have an effect on the flow; and 3) Waters with high salt content or sediment loads. I – Q = S The parameters of the above equation often have units of length: in, cm, ft, m Or volume: ft 3 , m 3 , cm 3 , gallons, liters, acre-ft To obtain volume units, need to multiply the length term by the cross-sectional area of interest.
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This note was uploaded on 02/18/2012 for the course GLY 4822 taught by Professor Staff during the Spring '08 term at FIU.

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IntroHydroLecture_2_2012 - Water Balance Equation can be...

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