Usually the trench drain reaches hydraulic capacity before grate intake hydraulics affect performance. Occasionally grate hydraulics become the determining factor, especially with restricted openings, e.g., perforated grates.
To calculate grate hydraulics, the following information is required;
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Trench length |
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Width of catchment area each side of trench |
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Pavement type |
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Geometry of catchment area including slope approaching the grate |
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100% Capture
All liquid flowing through grate |
Less than 100% Capture
Not all liquid flowing through grate, bypass has occurred. Could be due to not enough grate open area, too much liquid, or too much slope perpendicular to grate
ACO provides a complimentary service for grate intake hydraulics. Click here for details. |