flat-water pool
n.— «With apologies to Dr. Seuss, what do you call a swimming hole with no sprinklers, kerpinklers or soaking walinklers?…“In the business, we refer to it at as a flat-water pool,” says Peter Dunn of St. Louis County’s parks and recreation department. Over the past decade, those so-called flat-water public pools have been swamped by the steady rise of the water park. From Belleville to Fenton to Florissant to Arnold—and numerous locations in between—lazy rivers, speed slides, water sprayers and zero-entry wading pools have deluged the area.» —“Come on in, the water’s flat” by Jeff Daniel St. Louis Post-Dispatch (Missouri) May 29, 2006. (source: Double-Tongued Dictionary)