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Rate of Flow for Rectangular Grates rectangular type frame, grate
CAD/PDF files for rectangular frame, grate


Rate of Flow for Rectangular Grates


Rate of Flow Calculations for New York Rectangular Grates
A (#1) 2.16 sq. ft Open area of grate
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A (#3) 3.33 sq. ft. Open area of grate
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A (#6) 2.45 sq. ft. Open area of grate
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A (#9) 2.73 sq. ft. Open area of grate
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A (#11) 4.21 sq. ft. Open area of grate
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A (#16) 5.48 sq. ft. Open area of grate
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A (#22) 6.86 sq. ft. Open area of grate
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c 0.60 Orifice coefficient (Square edges)
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f 0.66 Clogging factor
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g 32.20 ft./sec. 2 Acceleration of gravity
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h ft. Measured head of water on grate
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Q cu. ft./sec. Discharge of water
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Calculate flow rate using the following formula:
Q = (cA 2gh) f


Head (in.) Rate of Flow (cu. ft./sec.)
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  #1 #3 #6 #9 #11 #16 #22
1 1.98 3.05 2.24 2.51 3.86 5.02 6.29
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2 2.80 4.32 3.17 3.54 5.46 7.10 8.90
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3 3.43 5.29 3.89 4.34 6.68 8.70 10.89
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4 3.96 6.10 4.49 5.01 7.72 10.05 12.58
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5 4.43 6.82 5.02 5.60 8.63 11.23 14.06
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6 4.86 7.47 5.50 6.14 9.45 12.30 15.41
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E: sales@syrcast.com
P: 315-699-2601   F: 315-699-2982
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Cicero, NY 13039


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