MANHOLE CASTING REFERENCE GUIDE
MANHOLE CASTINGREFERENCE ........................................ ........2Load ........................................ .....................3Key Dimensions of Round Frame and Cover ................3Key Dimensions of Inlet Frame and Grate ....................4Frame Designs ........................................ ......................5Grate Designs ........................................ .......................6Curb Inlets or Combination Inlets .................................7Watert ight Frames and Covers .....................................8Ai rport Castings ........................................ .....................8Manhole Features ........................................ .............9-10NATIONAL PRECAST CONCRETE ASSOCIATIONWith nearly 1,000 member companies, NPCA serves as the voice of the precast concrete industry in the United States and Canada.
Hydraulic Efficiency The hydraulic efficiency of a grate is its rated ability to intercept storm water. Hydraulic tests prove that the Vane style grate, properly installed, will accept as much as 20% more water than any of the conventional grate styles. Cross section of vane-style grate in testing flume showing hydraulic performance at 2 cfs ...
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