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NCEES 2011 No. 502

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This question got me all confused. The final part says the inlet head is 10ft above the invert of the inlet end .

I find it hard to understand/visualize the basin as described.

Viessman & Hammer defined h as the elevation of the center-line of the outlet. Now, I would understand if the question says "inlet head is 10ft above the invert of the outlet end"

Am I missing something or maybe i need to brush up my knowledge of discharge from tanks/stormwater storage?

Here are my thoughts:

If the inlet and outlet pipes are at the same elevation (bottom of drain), then h = 10 - (D of outlet*0.5)

The diameter of the inlet does not matter.

makes more sense now.

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