Water supply should be enough to provide at least 20 gallons per minute of water for 15 minutes (Section 4.1.2, 4.5.5). Hand free valve should be able to open within one second and remain open until it is manually closed (Section 4.2, 4.1.5). The top of the water column shall not be lower than 82" (208.3 cm) and no higher than 96" (243.8 cm) above the surface floor the user is standing on(Section 5.1.3, 4.5.4).