The answer is number 2) Increase the resistance of the concrete to freeze-thaw damage.
Answer:
V = 0.5 m/s
Explanation:
given data:
width of channel = 4 m
depth of channel = 2 m
mass flow rate = 4000 kg/s = 4 m3/s
we know that mass flow rate is given as

Putting all the value to get the velocity of the flow


V = 0.5 m/s
Answer:
6.9
Explanation:
I had the same question lol your welcomr if itd not right in sorry
I attached a photo that explains and gives the answer to your questions. Had to add a border because the whole picture didn’t fit.