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Quick Reference
In 1 playbook
Breakdown
Flood is a classic three-level stretch to the strong side, built off Shotgun Split Y-Flex 21 personnel. The outside receiver runs a deep corner route, the TE or slot runs an intermediate square-in that sits behind it, and the HB releases out of the backfield on a flat route underneath, creating three distinct depths on the same side of the field. On the backside, the far receiver runs a shallow drag across the formation as a checkdown or man beater against trailing corners. This is a Cover 3 beater by design, and the primary read progression is high to low: corner first, then the square-in, then settle to the flat if the zone rotates hard to the deep third.
Defensive Reads
Pre-snap, check the free safety depth and alignment: a single high safety shaded to the flood side signals Cover 3 and tells you the flood concept has a strong shot at winning outside. Watch the flat defender (corner or outside linebacker) at the snap, since if he sinks with the corner route the square-in route sits open in the void behind him. If the defense shows two deep safeties pre-snap, expect the corner route to be contested and look to work the square-in or backside drag instead. Key the strong side linebacker or nickel defender for a lurk into the flat route, since a user controlled defender sitting on the flat can bait a quick throw and jump the route for a pick six. Man coverage with press corners at the line is the biggest red flag, since the flood routes are not designed to separate quickly against tight man technique, so be ready to bail to the backside drag or check the play at the line.
Usage Tips
Pre-snap, identify single-high shells like Cover 3 or Cover 1 since the vertical stretch to the flood side is designed to attack the deep third defender who cannot cover all three levels. If you see two safeties deep (Cover 2 or Cover 4), consider hot routing the corner route to a deep out or checking to Corner Strike instead for a cleaner win against a split safety look. Use the backside drag as your answer versus man coverage or if the flood concept is jumped by an aggressive underneath defender, since it clears space away from the trips look. On third and medium or third and long, this play shines because the flat route holds the underneath defender while the corner and square-in stack the sideline. Pair this call with Y Shallow Cross or Mesh from the same set to keep the defense guessing between a man beater and a zone flood, forcing linebackers to hesitate on their drops.
