A rectangular channel with a width of 12 m carries water at a rate of 150 m³/s. At the end of the channel, there is a horizontal concrete apron with a width of 12 m, where the water depth is 3 m.
What is the total cross-sectional area of the water flow?
a) 1800 m²
b) 1872 m²
c) 1944 m²
d) 2016 m²
