Perimeter curb
Definition
A low raised edge — usually 2–6 inches tall — that bounds the splash deck, defining the wet-zone boundary and channeling drainage back toward the trenches.
Perimeter curbs serve three roles: they stop spray runoff from migrating onto adjacent walkways, they give kids and parents a visual boundary, and they double as informal seating along the edge of the pad.
ADA-compliant designs use curb cuts at least at the main entry and at any companion-seat zone, so wheelchair users can roll directly onto the deck without lifting over the curb.