What is the mandatory drainage slope for outdoor pickleball concrete slabs?

Proper drainage engineering is essential to avoid pooling water, known as 'birdbaths', which blister acrylic surfacing and delay post-rain play. The American Sports Builders Association (ASBA) mandates a minimum uniform slope of 1:120 (0.83%) to 1:100 (1.0%) along a single continuous plane (typically side-to-side or diagonal). Multi-directional crowns, common in highway civil engineering, are strictly prohibited on pickleball courts because any surface apex causes erratic ball bounces across the kitchen line. After heavy rain, a properly sloped court should shed surface water within 45 to 60 minutes with squeegee assistance.