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
| \(\large{ Q = A_c \; v }\) |
Where:
| Units | English | Metric |
| \(\large{ Q }\) = flow rate | \(\large{\frac{ft^3}{sec}}\) | \(\large{\frac{m^3}{s}}\) |
| \(\large{ A_c }\) = area cross-section | \(\large{ft^2}\) | \(\large{m^2}\) |
| \(\large{ v }\) = velocity | \(\large{\frac{ft}{sec}}\) | \(\large{\frac{m}{s}}\) |
Related Flow Rate formulas
| \(\large{ Q = C_v \; \sqrt {\frac{SG} {\Delta p} } }\) | (Flow Coefficient) |
| \(\large{ Q = k \; i \; A_c }\) | (Hydraulic Gradient) |
| \(\large{ Q = \frac{ 1.49 }{ n } \; A_c \; r_h^{2/3} \; S^{1/2} }\) | (Manning's Roughness Coefficient) |
| \(\large{ Q = \frac{ 3960 \; WHP }{ h_t } }\) | (Water Horsepower) |
Where:
\(\large{ Q }\) = flow rate
\(\large{ A_c }\) = area cross-section of flow
\(\large{ S }\) = channel slope or energy slope line
\(\large{ C_v }\) = flow coefficient
\(\large{ k }\) = hydraulic conductivity
\(\large{ i }\) = hydraulic gradient
\(\large{ r_h }\) = hydraulic radius
\(\large{ \Delta p }\) = pressure differential
\(\large{ SG }\) = specific gravity of fluid (water at 60°F = 1.0000)
\(\large{ h_t }\) = total head or height
\(\large{ WHP }\) = water horsepower
