1. The Ferret Turbidity Terminators Shubha Bhar Lindsay Ellis Morgan Rog Melanie Tan

2. Project Goals Obtain constant flow rate of 20 L/day Design an inexpensive, practical, and easy to use device Consider effects of turbidity Consider effects of varying flow Determine whether design is sustainable Improve WHO design

3. Our Design What’s Different? Rigid, straight tube Contractible flexible tube Centered weight No String Q = KA o (2gΔh) 1/2 Calculated Parameters: Orifice size: 0.8 mm Headloss: 10 cm

4. Schematic 1)User pours water in top bucket 2)As water flows through rigid tube, flexible tube contracts 3)Water collects in bottom bucket at a constant flow

5. Concerns  Finding contractible tubing  Not using a string  Orifice Clogging  Orifice Size  Upward force of Ferret Tube  Tilting/Balancing the weight  Waterproofing

6. Building Our Device Materials:  5 gallon bucket  small bucket  3/8’’ PVC piping  Ferret Tunnel  Epoxy  Aquarium Sealant  Putty  Duct Tape Roll

7. Building Problems  Waterproofing the Ferret Tunnel  Orifice Size, K value

8. Testing for Leaks: 1 st Trial Trial Time: 30 minutes

9. Testing the Flow: 2 nd Trial Over a period of 2.5 hours

10. Testing the Flow: 3 rd Trial Over a period of 5 hours

11. Testing the Flow: Turbidity Trial Over a period of 8 hours

12. Analysis  Achieved approximately constant flow rates  We didn’t obtain Q= 20 L/day Possible Reasons for Flow Fluctuations Possible Leaks Tilting PVC tube, may have caused friction Upward force of ferret tube

13. Recommendations  Clear bucket, easier maintenance  Better waterproofing  Precise Orifice  Use of automatic draining valve