A
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Unsubmerged entrance and exit. Critical flow at entrance. Upstream controlled.
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B
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Submerged entrance and unsubmerged exit. Orifice flow at entrance. Upstream controlled. For circular culverts, only available in Method B.
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C
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Unsubmerged entrance and exit. Critical flow at exit. Upstream controlled.
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D
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Unsubmerged entrance and exit. Sub-critical flow at exit. Downstream controlled.
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E
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Submerged entrance and unsubmerged exit. Full pipe flow. Upstream controlled.
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F
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Submerged entrance and exit. Full pipe flow. Downstream controlled.
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G
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No flow. Dry or flap-gate active.
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H
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Submerged entrance and unsubmerged exit. Adverse slope. Downstream controlled.
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J
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Unsubmerged entrance and exit. Adverse slope. Downstream controlled.
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K
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Unsubmerged entrance and submerged exit. Critical flow at entrance. Upstream controlled. Hydraulic jump along culvert. Method B only.
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L
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Submerged entrance and exit. Orifice flow at entrance. Upstream controlled. Hydraulic jump along culvert. Method B only.
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