1. Providing Access to Clean Water

2. Water filtration, flow rate How should we define flow rate? Water filtration systems should be as fast as possible while maintaining acceptable water.

3. Water filtration, flow rate How should we define flow rate? -volumetric flow rate (mL/sec) Water filtration systems should be as fast as possible while maintaining acceptable water.

4. Measuring flow rate Flow rate = volume / time Discuss in groups, how will your group measure the flow rate of your water filter?

5. Water filtration challenge Today The challenge is to build a filter under the budget, that has the highest flow rate, and has the “cleanest” water.

6. Engineering constraints, $5.00 per group! Chemicals and Active Elements Price per unit Activated Charcoal$0.25/g Sand$0.50/g Gravel$0.05/g Ethanol $0.10/mL Bunson Burner/Hot plate Iodine Disposable GoodsPrice per unit Pipette$1.00each Cotton Balls$0.50each Dixie Cup $0.50 Lab EquipmentPrice per unit Graduated Cylinder$2.00each Beaker$1.00each

7. Pause and Reflect Identify the person who has spoken or had their hands on the materials the least That person will make the decision as to what the next step is that the group will take at this moment