Hydraulic Efficiency of Grate and Curb Inlets - Urban Drainage and ...

Note
Safety
Bar
Figure 3-28: R5 with safety bar photograph
3.4 Model Operation and Testing Procedures
A headbox was used to supply water to the model, a flume section contained the street
and inlet components, and a tailbox was used to catch flow that bypassed the inlets. Figure 3-29
provides a sketch of the entire model. Water flowed from the inlet valve to the headbox, through
the flume section, then exits into the tailbox. Two pumps fed water to the headbox through a
network of large pipes and valves. A 40-horsepower (hp) pump was used for the 0.33-ft and
0.50-ft prototype-scale depths, and a 75-hp pump was used for the 1-ft prototype-scale flow
depth. Both pumps drew water from a sump located beneath the laboratory floor, which was
approximately 1 acre ft in volume. Lined channels below the flume conveyed flow away from
the tailbox and back into the sump.
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