31. The softer red shale below is eroded away by water, sand and gravel to form the plunge pool . 32. The plunge pool was drained in 2013 to allow for a safety inspection of the base of the dam. 33. Water slides run into a swimming pool ( often called a plunge pool ) or a long run-out chute. 34. Those tunnels emerge through one structure on the left abutment, downstream of the dam, augmented by a plunge pool structure. 35. Due to the effects of flash floods, the appearance of Havasu Falls and its plunge pools has changed many times. 36. The Florence Falls plunge pool is listed as " great for a refreshing swim " besides the usual safety warnings. 37. These blocks of rock are then broken down into smaller boulders by abrasion, creating a deep plunge pool or gorge. 38. The house also has a Finnish sauna with plunge pool and relaxation room, a fitness room and table tennis facilities. 39. Native species found when the plunge pool was pumped dry include two steelhead trout, 26 California roach and 22 Sacramento suckers. 40. Over time, as boulders fall over the waterfall, they erode deeply at the base of the waterfall, forming a plunge pool .
