Answer: 1 Cusec = 28.317 litres
For flow rate calculation, Cusec is used and Cusec is equal to cubic feet per second.
We know that
One feet is equal to 30.48 cm
So,
1 cubic feet = 30.48 cm ✕ 30.48 cm ✕ 30.48 cm
1 cubic feet = 28,316.85 cm3
To convert cm to liter we need to divide it by 1000.
⇒ 28,316.85 / 1000
⇒ 28.317
1 Cusec = 28.317 litres per second
Cusec is a derived unit not a fundamental unit and it is derived using fundamental units of time and volume.