Urban Storm Drain Design: Sag inlets. Sag Inlets Inlets placed at low point of a vertical curve. Various actual geometries, lowest point is the key feature.

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Presentation transcript:

Urban Storm Drain Design: Sag inlets

Sag Inlets Inlets placed at low point of a vertical curve. Various actual geometries, lowest point is the key feature.

Ponded width vs. vertical curvature As slope of vertical curve decreases, spread width increases

Ponded width vs. vertical curvature Median inlet configuration

Ponded width vs. vertical curvature Median inlet configuration

Inlets and inlet performance (Videos) Grate On-Grade

Inlets and inlet performance (Videos) Grate with Ditch Block (Sag Condition)

Inlets and inlet performance (Videos) Tandem Grate Inlets On Grade

Inlets and inlet performance (Videos) Tandem Grate Inlets with Ditch Block (Sag Condition)

Inlets and inlet performance Grate Inlets in Sag Conditions Weir Flow at Low Depth Orifice Flow at Large Depth

Inlets and inlet performance Choose grate of standard dimension (e.g. Type-H, etc. from standards and specifications server)

Inlets and inlet performance Choose grate of standard dimension (e.g. Type-H, etc. from standards and specifications server)

Inlets and inlet performance Determine allowable head (depth) for the inlet location. Lower of the curb height and depth associated with allowable pond width

Inlets and inlet performance Determine the capacity of the grate inlet opening as a weir. Perimeter controls the capacity.

Inlets and inlet performance Determine the capacity of the grate inlet opening as an orifice. Area controls the capacity.

Inlets and inlet performance Compare the weir and orifice capacities, choose the lower value as the inlet design capacity.