What is the Basis for calculation of basic charges ?
Based on (1) the standard basic charge of NT$34 monthly per household installed with a 13 mm water meter and (2) the pipe diameter equivalent value of all other sized meters, basic charges for all households are acquired by multiplying NT$34 by the equivalent values. Diameter of Meter (mm) 13 20 25 40 50 75 100 150 200 250 300 Pipe diameter equivalent value 1 2 3.7 11 20 54 107 297 590 1,042 1,635 Monthly basic charge per household (NT$) 17(34) 68 126 374 680 1,836 3,638 10,098 20,060 35,428 55,590 To exemplify, let’s compare a13 mm and a 100 mm meters. Assuming same water pressure and friction coefficient, then the volume of water flow from a single 100 mm pipe equals the combined volume of water flows from 107 pieces of 13 mm pipes. Therefore, the basic charge of a household using a 100 mm meter = that using a 13 mm meter (NT$34) x 107 = NT$3,638.
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