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Nov 29, 2012

The SSA literature states to use an On Sag inlet to model an inlet used in the middle of a parking lot.

This is more commonly known as an "Area Inlet" application, and is also used in areas such as airport runways, greenbelts and golf courses.

To develop the correct operating head relationship over the grate, we need to be able to enter a stage-storage curve starting from the grate elevation. This will develop the "cone" shape storage needed to develop the correct head elevation over the grate.

It appears looking at the On Sag options there is only the Ponded Area parameter available; the same parameter found in a Junction. This calculates the head elevation as a function of the ponded volume and a constant area.
 
I want to confirm that the On Sag inlet application used as an Area inlet, is using all four sides, full perimeter = 2(L+W),  of the inlet for the weir flow calculations before orifice flow controls, not just 3 sides as a grate on a curb. 

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