Page 291 - Facility Piping Systems Handbook for Industrial, Commercial, and Healthcare Facilities
P. 291
SITE UTILITY SYSTEMS
SITE UTILITY SYSTEMS 6.13
FIGURE 6.10 Typical precast manhole.
• A combination grate is a plain grate and curb grate acting as a single unit with one placed
in front of the other.
• Multiple inlets are two closely placed inlets acting together.
• A round grating cannot fall into a drainage structure.
• Flat grates are assumed to be flush with grade and flooded.
Grates Installed in Flat Areas (1 Percent or Less). The following empirical formulas
have been developed for the selection of gratings:
Plain Grate.
SF × Q = C L H / 23 (6.2)
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