MODEL ANALYSIS TO DETERMINE HYDRAULIC CAPACITIES OF KERB INLETS AND GULLY PIT GRATINGS

This report deals with information derived from laboratory tests on models of kerb inlets and gully gratings. The study investigated the effect on gully pit inlet capacity of several design features including gutter flow, road grade and crossfall, grating design, kerb inlet extensions, gutter depression, gutter deflectors and lintel supports. For an inlet consisting only of a grating, the design of the grating significantly influences capacity. For an inlet consisting of a grating and a kerb inlet, the efficiency of the grating becomes less important as the kerb inlet is extended. For an inlet consisting only of a kerb inlet, increasing gutter depression significantly increases capacity if crossfall is 3 percent or greater and flow is moderate to high. For an inlet consisting of a grating and 2 metre extended kerb inlet depressed 25mm, the best position for the extension is upstream of the grating for 3 percent and 5 percent crossfalls. For 1 percent crossfall a better arrangement is to have 1 metre of extension upstream and 1 M of extension downstream. Gutter deflectors with an inlet consisting of a grating and a kerb inlet are of most benefit at flat crossfalls. Rectangular deflectors are more efficient than the sawtooth type. The presence of lintel supports for a kerb inlet has no effect on capacity. (TRRL)

• Corporate Authors:

  New South Wales Department of Main Roads,Australia

  P.O. Box 198
  Haymarket, New South Wales 2000,   Australia 
• Publication Date: 1979

Media Info

• Features: Figures; Photos; Tables;
• Pagination: n.p.

Subject/Index Terms

• TRT Terms: Culvert inlets; Curbs; Design; Drainage; Drains; Economic efficiency; Flow; Grates; Gullies; Gutters; Hydraulic fluids; Hydraulics; Hydrologic phenomena; Laboratories; Mathematical models; Tests
• Uncontrolled Terms: Capacity; Efficiency; Inlets; Models; Transverse profile
• ITRD Terms: 9011: Design (overall design); 4323: Discharge (flow); 5911: Efficiency; 2928: Gully; 2949: Gutter; 5431: Hydraulics (fluid); 2917: Kerb; 6237: Laboratory (not an organization); 6205: Model (not math); 6255: Test; 2843: Transverse profile
• Subject Areas: Design; Economics; Highways; Hydraulics and Hydrology; I26: Water Run-off - Freeze-thaw;

Filing Info

• Accession Number: 00315285
• Record Type: Publication
• Source Agency: ARRB
• Report/Paper Numbers: Monograph
• Files: ITRD, TRIS, ATRI
• Created Date: Oct 27 1980 12:00AM