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2.3.7 Hydraulic Drop

The converse of the hydraulic jump, the hydraulic drop, can also occur due to an abrupt change in channel slope or cross-section. It can frequently occur near the entrance to a culvert flowing under inlet control. An explanation of culverts flowing under inlet control is given in Section 3.8.3 – Culverts Inlet Control.

Figure 2.18: Length of hydraulic jump in terms of sequent depth (y2) in horizontal channels

Fig 4

Source: Chow (cited in DTMR 2010).