I could do with some help calculating the discharge rate from a reservoir and factoring in how that flow will decrease as the head of water decreases.
The information I have is:
Maximum height of water in the reservoir is: 10.52m
Diameter of the pipe: 0.3m
length of the pipe: 450m
fall of piper from the reservoir to discharge: 14m
I have already calculated the velocity using Hazen-Williams through the pipe using a C value of 140 (cement lined ductile iron pipe) but I'm unsure of how use this and the head of water to calculate the actual discharge rate. I suspect using Bernoulli's would work but I'm unsure as I've confused myself thinking about it so much!
I may have barked up the wrong tree using Hazen-Williams so any help would be appreciated.
