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EWB-NCSU

EWB-NCSU. Bolivia Water Supply Project. Why Do They Need Additional Water Supplies?. School Students Add to Population Rainfall Avg. 8.5 in/yr 0.7 in/month Rainy season Nov –Feb No rain in April – August. Current Water Supply. 5000L Rainwater Tank Lower Spring

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EWB-NCSU

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  1. EWB-NCSU Bolivia Water Supply Project

  2. Why Do They Need Additional Water Supplies? • School Students Add to Population • Rainfall • Avg. 8.5 in/yr • 0.7 in/month • Rainy season Nov –Feb • No rain in April – August

  3. Current Water Supply • 5000L Rainwater Tank • Lower Spring • Connected from Spring with ¾” semi-flexible HDPEP • Upper Tanks • 1000L Plastic Tank • 1000L Fiberglass Tank • 3000L Concrete Tank • Lower Tanks • 9000L Concrete Tank • Upper Spring • Disconnected • Used to Feed Upper Tanks before Earthquake

  4. Sources of Additional Water • Reconnect Upper Spring • Increase Storage Capacity from Springs • More tanks • Change Pumping Schedule from Lower Box to Upper Box to Avoid Loss through Overflow • Additional Rain Water Harvesting Systems • River (2-3 hrs round trip to collect water)

  5. Known Materials Available • Fiberglass Tanks • PVC pipe (up to 4” dia.) and fittings • Caulk • Valves • Pumps • Gutters • Electricity

  6. Water Demand • Assessment Trip Report: • 150 people in approx 0.5 sq miles • Post Implementation Report: • 60 people • 8 gallons/day • School Year Round • Irrigation • School • Community

  7. Concerns - Feasibility • Feasibility • Engineering Design • Head Loss • Pump Capacity • Pipe Protection • Soil Condition for Burying Pipe • Materials to Protect Above Ground Pipe • Larger Dia. Pipe • Concrete • Maintenance • Who? • Where does money come from?

  8. Concerns – Water Quality • Sources • Potential Leaks in Tanks • Potential Leaks in Lids to Tanks • Animal Waste • Dust/ Atmospheric Deposition • Sediment Accumulation in Tanks • Lack on Maintenance • Standing Water • Direct Contact / Poor Hygiene • Factors • Turbidity • Bacteria • Nitrites/Nitrates • Metals from Roof • pH • Iron

  9. Base Line Data • Water Demand per Person • Water Demand variation throughout year • School Breaks/Vacations • Irrigation / Growing Season • Number of People Using Water • Uses of Water • Cooking • Handwashing • Irrigation • Rate and Duration of Springs • Incidence of Sickness due to Poor Water Quality

  10. Potential Educational Opportunities • Pipe Repair • Tank Maintenance • Teaching Rain Water Harvesting • Teaching Sustainable Irrigation Methods • Teaching Home Water Use • Prevent Contamination • Teaching Hygiene • Requires Larger Water Supply

  11. Goals of Assessment Trip • Water Demand • Max. Demand Period • Population Growth • Future Development / School / Health Center • Determine Water Supply • Dry Season Flow • Determine Areas for Optimization • Assess Spring Box Design and Maintenance Solutions • Determine What Materials are Available • Characterize Soil – Tank and Pipe Limitations • Determine Current Hygiene Situation and Areas for Improvement • Determine Areas for Education • Compare with Designs / Solutions in Other Communities • Expectations of Community • Pictures and Dimensions

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