![]() For a given pressure difference driving the flow, the water flow rate increases as diameter increases for a given pipe length and the water flow rate decreases as pipe length increases for a given pipe diameter. ![]() The table shows a pattern that you should intuitively expect. Water Flow Rates for Pipe Sizes with Excel Formulas, Using the Hazen Williams Formula The Hazen Williams coefficient was taken to be 150 per the table in the previous section. The table below was prepared using the equation: Q = 0.442 C D2.63 (ΔP/L)0.54, with units as given above, to calculate the water flow rates for PVC pipe with diameters from 1/2 inch to 6 inches and length from 5 ft to 100 ft, all for a pressure difference of 20 psi across the particular length of pipe. Source: Toro Ag Irrigation (PDF) Example Calculation of Water Flow Rates for Pipe Sizes and Lengths C values typically used for some common pipe materials are shown in the table at the left. Values of C are available in many handbooks, textbooks, and on internet sites. In order to use the Hazen Williams formula for water flow rate calculations, values of the Hazen Williams coefficient, C, are needed for the pipe material being used. Values for the Hazen Williams Coefficient The second page of this article has a table with values for the Hazen Williams coefficient, a table with example water flow rate calculations for several PVC pipe lengths and diameters, and a link to download a spreadsheet template with Excel formulas to make the water flow rate calculations. units, as illustrated in the section after next on the second page. This is a form of the Hazen Williams formula that is convenient to use for estimating water flow rates for pipe sizes and lengths in U.S.
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