Drainage trench
Definition
A linear grated channel — typically 4–8 inches wide — embedded in a splash pad surface to collect spray runoff and route it to the recirc tank or sewer without standing puddles.
Drainage trenches replace the older 'sloped pad with center drain' design at most modern splash pads. The linear grates handle high flow rates without ponding and are easier for ADA wheelchair users to roll across than round bowl drains.
Trenches must be cleaned weekly during peak season — sunscreen, leaves and grit accumulate fast and slow drainage, which can create puddles that fail the zero-depth design.