Page 293 - Facility Piping Systems Handbook for Industrial, Commercial, and Healthcare Facilities

SITE UTILITY SYSTEMS

SITE UTILITY SYSTEMS 6.15

FIGURE 6.12 Graphical solution for a plain flooded grate. (Courtesy Bureau of Public Roads, Baltimore
County.)

Curb Grate. This type of inlet is rarely used alone unless conditions do not permit any
other type and, in addition, favorable inlet depression and contour is possible. Figure 6.13
can be used to determine flooded curb grating size.
Combination Grate. Experiments have shown that combination grates do not admit
substantially more water than a flat grate; therefore, Eq. (6.2), for the plain grate, should be
used to determine the size. An additional 10 percent for paved areas and up to 75 percent for
other areas should be added as safety factors plus an additional 25 to 75 percent as a debris
factor. This type of grate is preferred where provision to collect all storm water is required.
The curb grate acts as a safety valve when a flat grate is clogged with debris.

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