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

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

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

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

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

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

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

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

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

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

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

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

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