Modeling Evapotranspiration in the Hydrologic Cycle

1. Modeling Evapotranspiration in the Hydrologic Cycle ORE 2009

2. Procedure Crazy Glue for repairs Over flow Magenta Line Check to make sure that “bathtub” is intact without cracks or other damage. Use clips to block flow through straws and fill with water up to the magenta line to check for leaks. Release clips and empty water. Experiment: What conditions are necessary to maintain a dynamic equilibrium at the black line with all drains open? Use water from a faucet to add to the bath tub toestablish these conditions. Repeat the experiment but now use the magenta line as equilibrium point. Try to express your observations mathematically. Which variables do you need to measure to model your results? Measure those parameters under a range of conditions to test your model. Possible variables to use – volume of bath tub, faucet flow rate, drain flow rate, overflow flow rate, depth of water in tub, drain diameter, gravity (9.8 m/s/s). Black line Drain Binder clips to close drain flow

3. STELLA from ITS Moodle • Download Stella • Reservoir (noun) • Flow and valve (verb) • Connector (adverb) • Basic Model Concepts – bath tub