Is it better / easier for the storm structure manufacturers to make a square/rectangular or a round orifice in an outlet control structure, maybe 8 inches ish?
Locally, the lower openings are precast and round. Overflows are typically cut on site?ÿ after the pond has been built and the engineer has looked at the as-built volume. Overflows are rectangular.?ÿ
The real reason they even make round outlets is so that engineers and surveyors can giggle when they say "orifice equation"?ÿ
Overflows are typically cut on site?ÿ after the pond has been built and the engineer has looked at the as-built volume
Interesting approach, around here we just try and build them to match the plan design in the first place ?????ÿ
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What??ÿ No V-notch weirs?
I can work with those...engineering is like surveying in the PLSS (according to the occasional ornery Texan), all you need is the right "cookbook" ????
Perhaps we are talking about two different things. But around here a storm drainage structure orifice is located on the bottom of a CMP tee inside of a MH and (here in the land or copious rainfall) is usually less than 2" diameter.?ÿ
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I believe the OP was talking about the low flow orifice either the weir or riser for an old-school (at least around these parts) SWM extended detention pond. Here it's designed to route the 2 year storm, so that the pre and post development runoff stays the same.