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Theoretical Limit of lift to siphon by physics and bernoulli equation (and in most published sources)is about 32.8 ft, decreases with altitude with lower density air. YET in practical life, said lift is about 20 ft at sea level and drops 1 ft per 1000 ft of altitude. Why the great difference...

Roger.  Have hired local engr firm. Scour would be from when water stages high enough and causes flow in submerged pipe on pond bottom. Plus, Scour is from outfall of the pond, 2 stage weir with no baffles or vel. dissipators....... at end of stilling pond is gully that has been carved into...

Fl and county just 4 laned road by me. If permanent pool of wet detention pond extends way back into the inlet pipe..... inlet pipe of Pond 1 for SR 415 is 2.2 ft submerged always. It's top elev is 5.5 ft (invert is at 6 inches and pipe is 5 ft diam) and permanent pool elev is 8.7. I believe...