# Flow Rate

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

Flow rate, abbreviated as Q, measure the amount of fluid that flows in a given time past a specific point.

## Flow Rate formulas

 FORMULA: SOLVE FOR: $$\large{ Q = A \; v }$$ $$\large{ Q = C_v \; \sqrt {\frac{SG} {\Delta p} } }$$ (Flow Coefficient) $$\large{ Q = k \; i \; A_c }$$ (Hydraulic Gradient) $$\large{ Q = \frac{ 3960 \; WHP }{ h_t } }$$ (Water Horsepower)

### Where:

$$\large{ Q }$$ = flow rate

$$\large{ A }$$ = area

$$\large{ A_c }$$ = area cross-section of flow

$$\large{ C_v }$$ = flow coefficient

$$\large{ k }$$ = hydraulic conductivity

$$\large{ i }$$ = hydraulic gradient

$$\large{ \Delta p }$$ = pressure differential

$$\large{ SG }$$ = specific gravity of fluid (water at 60°F = 1.0000)

$$\large{ h_t }$$ = total head or height

$$\large{ v }$$ = velocity

$$\large{ WHP }$$ = water horsepower