§ 7.72.191. Requirements for design and construction of recreational water features.

(1)

Waters discharged from all recreational water features such as interactive fountains or spray features shall not pond on the feature floor but shall flow by gravity through a main drain fitting to a below-grade sump or collection system which discharges to a surge tank. Access adequate for service and maintenance shall be provided to the sump and surge tank. A means of vacuuming and completely draining the tank shall be provided. Stairs or a ladder and necessary equipment shall be provided as needed to ensure safe entry into the tank. When an underground sump is utilized an automatic skimmer system shall be provided to adequately remove floating debris from the sump and surge tank system.

(2)

The total volume in the surge tank, including all piping, must be a minimum of four thousand gallons. The volume in the surge tank, including all piping, must also be a minimum of three times the flow rate of all attraction pumps and the recirculation pump(s) combined, e.g., if the flow rate of all pumps is two thousand gallons per minute, a volume of at least six thousand gallons would be required. An automatic water level controller shall be provided. An overfill waste line with air gap shall be provided.

(3)

All recreational water features shall require a recirculation filter system. The recirculation system must be on a separate loop and not interconnected with the jet spray pump. The filter system shall be capable of filtering and treating the entire water volume of the water feature within thirty minutes. If the surge tank in use exceeds the required minimum volume as stated in subsection (2) of Section 7.72.191, the time the filter system shall be capable of filtering and treating the entire volume of the water feature may be increased proportionately; e.g., if a six thousand gallon tank is required, and a twelve thousand gallon tank is in use, the filtration and treatment time may be increased to within sixty minutes. The filter system shall draft from the lowest portion of the surge tank and return filtered and treated water to the tank via equally spaced inlet fittings. The flow rate through these fittings shall not exceed twenty gallons per minute (gpm).

(4)

The suction intake of the jet spray pump in the surge tank must not be located in the immediate vicinity of the suction intake of the recirculation pump. It must be located as close as possible to the recirculation return line inlet fittings.

(5)

The feature spray devices must be designed, constructed, and installed so that they do not create a safety hazard. Nozzles that spray from the ground level must be flush with the ground, with openings no greater than one-half inch. Spray devices that extend above the ground must be high enough so they can be clearly seen and are not a trip hazard. The flow rate through the feature nozzles of the water features shall not exceed twenty feet per second, unless justified by the fountain designer and the fountain system manufacturer, and approved by the health officer.

(6)

All foggers and jet nozzle sprays that produce finely atomized mists must be connected to a separate potable water source.

(7)

Chemical feeders shall be provided and the disinfection feeder shall be capable of feeding 12mg/L of free chlorine to the filter return piping. Automated oxidation reduction potential (ORP) and pH controllers with sensing probes shall be provided to assist in maintaining proper disinfection and pH levels. A separate point-source chlorinator may be required on the jet spray piping if the proper free chlorine residual required in Section 7.72.120 cannot be properly maintained.

(Ord. No. 46-592 § 1 (part))