Piano Key Spillways
“A piano key (PK) weir is a recently developed alternative to traditional labyrinth weir designs that was developed specifically for smaller control structure footprint applications. Two main differences of PK weir designs, relative to traditional trapezoidal labyrinth weir designs are: (1) the PK weir has a simple rectangular crest layout (in plan view), essentially creating a labyrinth weir with α = 0 (rectangular labyrinth weir), and (2) the PK weir geometry has sloped or ramped inlet and outlet cycle or key floors. Where the available footprint for the control structure is limited, the sloped floors cantilever the cycles beyond the spillway footprint providing the PK weir with a longer crest length relative to traditional labyrinth weir designs with the same footprint."[1]
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Revision ID: 5456
Revision Date: 12/13/2022