By Dawei Han
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It can be seen that evaporation increases when wind speed and vapour pressure deficit increase. It decreases when air pressure goes up. Please click the advert Student Discounts + Student Events + Money Saving Advice = Happy Days! com 42 3. 05 (11) is evaporation rate in mm/day based on Hefner study, A is the water surface area (m2), eos and e2a are as previously defined (Pa), u2 is in m/s. More empirical equations can be found in Viessman and Lewis (1996). 3 Combined method The energy balance method may be used when transport is not limiting and the aerodynamic method is used when energy supply is not limiting.
This enables the transfer of standard values for K c between locations and between climates. com 44 3. 1 Pan An evaporation pan is used to hold water during observations for the determination of the quantity of evaporation at a given location. Often the evaporation pans are automated with water level sensors and a small weather station is located nearby. Pan evaporation is used to estimate the evaporation from lakes and land. Evaporation from a natural body of water is usually at a lower rate because the body of water does not have metal sides that get hot with the sun.
GCHQ values diversity and welcomes applicants from all sections of the community. We want our workforce to reflect the diversity of our work. com 63 5. Groundwater Concise Hydrology 5. Groundwater Groundwater is the water beneath the ground surface contained in void spaces (pore spaces between rock and soil particles, or bedrock fractures). 1 Aquifer An aquifer is an underground layer of water-bearing permeable rock or unconsolidated materials (gravel, sand, silt, or clay) from which groundwater can be usefully extracted using a water well.