# Determine the water flow rate per day at the mouth of the river, which flows at a speed of 0.6 m / s, has a depth of 1.8 m

Determine the water flow rate per day at the mouth of the river, which flows at a speed of 0.6 m / s, has a depth of 1.8 m, a width along the water surface – 7.5 m, and along the bottom – 4.5 m. Water discharge is the volume of water that flows per unit of time through the cross section of a river. It is determined by the formula: Q = F × V, where F is the cross-sectional area of the river, V is the current velocity.
1) The cross-section of the river is trapezoidal. The area of the trapezoid is determined by the formula:
S = (a + b): 2 × h = (7.5 m + 4.5 m): 2 × 1.8 m = 10.8 m2
2) Determine the flow rate in the river for 1 s:
Q = F × V = 10.8 m2 × 0.6 m / s = 6.48 m3 / s
3) Water flow per day is: 6.48 m3 × 60 s × 60 min × 24 h = 559 872 m3 / day
Answer: water discharge at the river mouth = 559,872 m3 / day. Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.