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Bathtub Water Level Model

Bathtub Water Level Model. Faucet. Drain. Water Supply. Sewer. Water Level. Water pressure. “Cloggage”. Key to Symbols. Cloud – input/output that doesn’t affect model. Converter – constant used within the model. Flow – causes conditions to change. Stock – tells what conditions are.

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Bathtub Water Level Model

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  1. Bathtub Water Level Model Faucet Drain Water Supply Sewer Water Level Water pressure “Cloggage” Key to Symbols Cloud – input/output that doesn’t affect model Converter – constant used within the model Flow – causes conditions to change Stock – tells what conditions are Link – connects two parts of a model

  2. Compound Interest Model Bank Balance Earning Interest R The R means that this is a self-reinforcing or “positive” feedback loop which makes the result exponential Interest Rate Key to Symbols Cloud – input/output that doesn’t affect model Converter – constant used within the model Flow – causes conditions to change Stock – tells what conditions are Link – connects two parts of a model

  3. Compound Interest Model Can be represented by a relatively simple equation Can also be shown graphically Where: A – Final amount P – Principle amount r – Interest Rate t – Time (years)

  4. Increased Resolution RequiresIncreased Computing Resources Rule of thumb: 10X more CPU for a doubling of resolution 1980’s 2000’s 1990’s

  5. Sources • Slide 1 and 2 • “An Introduction to Systems Thinking”, High Performance Systems, Inc. • Slide 3 • http://www.crackerjackgreenback.com/the-basics/compound-interest-a-lesson-from-benjamin-franklin/ • Slide 4 • http://co2now.org/Know-the-Changing-Climate/Climate-System/ipcc-faq-climate-change-weather.html • Slide 5 • http://www.atmosp.physics.utoronto.ca/people/guido/research.html • Slide 6 • http://serc.carleton.edu/eslabs/weather/5c.html • Slide 7 • http://serc.carleton.edu/eet/envisioningclimatechange/teaching_notes.html

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