A gutter inlet would have the grate in the gutter, like the combination inlet, but no curb opening. Both of the inlets shown in the pictures are undepressed, that is the gutter isn't depressed at the inlet.
depressed gutter inlet
The depressed gutter inlet shown in the figure at the left on the bottom uses a depression in the gutter at the opening to aid in capturing the stormwater flowing over the inlet. A combination inlet or a curb inlet can also be designed with a depression at the inlet. Gutter inlets will almost always have grates, but a curb inlet is usually open without any grates, as you can see in the pictures. As shown in the next two sections, the process for design of stormwater drains can use either an orifice equation or a weir equation to determine the required size for the curb and/or gutter opening.
Depressed Gutter Inlet Image Credit: H. Bengtson
Go on to page 2 for discussion of storm water inlet design equations and parameters using an orifice equation and using a weir equation. There is also an example calculation and there are Excel spreadsheets that can be downloaded from page 3.
An orifice equation can be used to size a storm water runoff curb inlet that is completely submerged at the design storm water runoff rate. An orifice equation also works for sizing a submerged gutter inlet. The inlet design is part of the overall design of storm water drains. See the orifice equation, the parameters used for storm water inlet design, and both U.S. units and S.I. units for the parameters. Similar information is given for a weir equation to be used for design of storm water drains, and example calculations using the orifice equation and using the weir equation.
A gutter inlet would have the grate in the gutter, like the combination inlet, but no curb opening. Both of the inlets shown in the pictures are undepressed, that is the gutter isn't depressed at the inlet.
depressed gutter inlet
The depressed gutter inlet shown in the figure at the left on the bottom uses a depression in the gutter at the opening to aid in capturing the stormwater flowing over the inlet. A combination inlet or a curb inlet can also be designed with a depression at the inlet. Gutter inlets will almost always have grates, but a curb inlet is usually open without any grates, as you can see in the pictures. As shown in the next two sections, the process for design of stormwater drains can use either an orifice equation or a weir equation to determine the required size for the curb and/or gutter opening.
Depressed Gutter Inlet Image Credit: H. Bengtson
Go on to page 2 for discussion of storm water inlet design equations and parameters using an orifice equation and using a weir equation. There is also an example calculation and there are Excel spreadsheets that can be downloaded from page 3.
An orifice equation can be used to size a storm water runoff curb inlet that is completely submerged at the design storm water runoff rate. An orifice equation also works for sizing a submerged gutter inlet. The inlet design is part of the overall design of storm water drains. See the orifice equation, the parameters used for storm water inlet design, and both U.S. units and S.I. units for the parameters. Similar information is given for a weir equation to be used for design of storm water drains, and example calculations using the orifice equation and using the weir equation.
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