Flow Rate
Flow rate, abbreviated as Q, also called volumetric flow rate, measure the amount of fluid that flows in a given time past a specific point if the temperature and pressure were at standard conditions.
Flow Rate formula |
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\(\large{ Q = A_c \; v }\) \(\large{ Q = C_v \; \sqrt {\frac{SG} {\Delta p} } }\) \(\large{ Q = k \; i \; A_c }\) \(\large{ Q = \frac{ 1.49 }{ n } \; A_c \; r_h^{2/3} \; S^{1/2} }\) \(\large{ Q = \frac{ 3960 \; WHP }{ h_t } }\) |
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| Symbol | English | Metric |
| \(\large{ Q }\) = flow rate | \(\large{\frac{ft^3}{sec}}\) | \(\large{\frac{m^3}{s}}\) |
| \(\large{ A_c }\) = area cross-section | \(\large{ft^2}\) | \(\large{m^2}\) |
| \(\large{ S }\) = channel slope or energy slope line | \(\large{ft}\) | \(\large{m}\) |
| \(\large{ C_v }\) = flow coefficient | \(\large{dimensionless}\) | |
| \(\large{ k }\) = hydraulic conductivity | \(\large{\frac{ft}{day}}\) | \(\large{\frac{m}{day}}\) |
| \(\large{ i }\) = hydraulic gradient | \(\large{dimensionless}\) | |
| \(\large{ r_h }\) = hydraulic radius | \(\large{ft}\) | \(\large{m}\) |
| \(\large{ \Delta p }\) = pressure differential | \(\large{\frac{lbf}{in^2}}\) | \(\large{Pa}\) |
| \(\large{ SG }\) = specific gravity of fluid (water at 60°F = 1.0000) | \(\large{\frac{ft}{sec^2}}\) | \(\large{\frac{m}{s^2}}\) |
| \(\large{ h_t }\) = total head or height | \(\large{ft}\) | \(\large{m}\) |
| \(\large{ v }\) = velocity | \(\large{\frac{ft}{sec}}\) | \(\large{\frac{m}{s}}\) |
| \(\large{ WHP }\) = water horsepower | \(\large{\frac{lbf-ft}{sec}}\) | \(\large{\frac{Btu}{s}}\) |
