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As the free-flow coefficient (K) and the free-flow exponent (n) depend only upon flume length, intermediate sizes Cutthroat flumes can be developed without the need for laboratory verification. The flat-bottomed design means that the flume can be retrofitted into existing channels without the need to raise the flume or adjust the downstream ...
Figure 1 shows a schematic of typical jump characteristics where E 1 is the energy of the upstream flow, E 2 is the energy of the downstream flow and L j is the length of the hydraulic jump. A series of small surface rollers are formed in a standing wave like the one shown in Figure 1. Hydraulic Jump Schematic1
Only the upstream depth needs to be measured to calculate the flow rate. A free flow also induces a hydraulic jump downstream of the flume. Submerged flow occurs when the water surface downstream of the flume is high enough to restrict flow through a flume, submerged flume conditions exist. A backwater buildup effect occurs in a submerged flume.
Only the single depth (primary point of measurement - Ha) needs to be measured to calculate the flow rate. A free flow also induces a hydraulic jump downstream of the flume. Submerged Flow – when the water surface downstream of the flume is high enough to restrict flow through a flume, the flume is deemed to be submerged.
The HEC-RAS model calculated that the water backs up to a height of 9.21 meters at the upstream side of the sluice gate, which is the same as the manually calculated value. Normal depth was achieved at approximately 1,700 meters upstream of the gate. HEC-RAS modeled the hydraulic jump to occur 18 meters downstream of the sluice gate.
Larger primary devices (and transitions) that do not readily fit into a standard 4 ft (1.2 m) precast manhole barrel, either a larger barrel or a concrete vault must be used which adds cost. Packaged metering manholes, on the other hand, can integrate primary devices that are larger than the manhole barrel – with any portion that doesn't fit ...
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