Page - 188 - in Clean Water Using Solar and Wind - Outside the Power Grid

188 Clean Water Using Solar and Wind: Outside the Power Grid U.S.,  to  denote the annual water consumption for a family or for irrigation. 1 acre-foot = 4,047 m2 ⋅ 0.305 m = 1,233.5 m3 (=43560 ft3 = 326,700 gallons). 1 cubic foot = 0.3053 m3 = 0.0284 m3 = 28.4 litres; 1 m3 = 35.25 cubic feet A2.5 MASS 1 pound (lb) = 0.4536 kg 1 metric ton = 0.984 long ton or English ton A2.6 CONCENTRATION Concentrations are often measured in mg/l (=ppm, parts per million) = kg/m3 A2.7 WATER USE IN ENERGY PRODUCTION/ GENERATION In some US sources we find gallons/MBtu (millions of Btu): 1 MBtu = 293 kWh = 1054 MJ 1,000 gallon/MBtu = 12.9 litres/kWh = 3.59 litres/MJ 1 litre/MJ = 279 gallons/MBtu A2.8 ENERGY USE IN WATER OPERATIONS kWh/million gallons: 1,000 kWh/million gallons = 1 MWh/million gallons = 0.264 kWh/m3 1 kWh/m3 = 3,780 kWh/million gallons = 3.78 MWh/million gallons kWh/acre-foot: 1,000 kWh/acre-foot = 1 MWh/acre-foot = 0.81 kWh/m3 1 kWh/m3 = 1230 kWh/acre-foot = 1.23 MWh/acre-foot Downloaded from https://iwaponline.com/ebooks/book-pdf/520710/wio9781780409443.pdf by IWA Publishing user