NR 811.61(8)(8) Each tank shall be identified by stamping or labeling showing the manufacturer’s name, a serial number, the tank volume, the allowable working pressure, and the year fabricated.

NR 811.61(9)(9) Each tank not equipped with a bladder or diaphragm to separate the air and water and with a gross volume of 500 gallons or more shall be constructed of steel and have a 0.25 inch minimum side wall and head wall thickness.

NR 811.62(1)(1) Volume requirements. A sufficient quantity of water, as determined from engineering studies, shall be maintained in elevated storage when only one pumping unit to the distribution system is available to serve the water system. This shall be at least an average-day supply under normal operating conditions. When more than one distribution pump is available, the storage shall be in accordance with standard engineering practice. Standard engineering practice is based upon an engineering review of existing and future water supply needs including: type of service and population served; average day, maximum day, peak hour and fire flow demands and durations; water source quality, availability and treatment, pump capacities, auxiliary power, storage capacity, water distribution and costs.

NR 811.62(2)(2) Pressure requirements. Storage facilities shall be designed to meet all the following requirements:

NR 811.62(2)(a)(a) Minimum and maximum pressures. The storage facilities shall be designed to meet the minimum and maximum pressure requirements specified in s. NR 811.66 (1).

NR 811.62(2)(b)(b) Fire flows and residual pressures. When fire protection is to be provided, the storage facilities shall be designed in conjunction with distribution system design to provide the minimum fire flows and residual pressures specified in s. NR 811.70 (6).

NR 811.62(2)(c)(c) Alternative means for maintaining pressure. A hydro-pneumatic tank, booster pumping facilities, or other reliable means shall be provided to maintain system pressure when a gravity storage reservoir or tank is not available.

NR 811.62(3)(3) Elevated storage requirement waived. The department may waive the requirement for elevated storage if the system is designed to serve less than 50 homes, if it is not economically feasible to provide elevated storage, if elevated storage facilities are proposed for a later development phase, or if service is proposed for domestic use only.

NR 811.63(1)(1) Floodway and floodplain.

NR 811.63(1)(b)(b) Floodplain. If it is necessary to locate a reservoir in a floodplain, as defined in s. NR 116.03 (16), outside of the floodway, the lowest elevation of the bottom floor, including sumps, shall be a minimum of 2 feet above the regional flood elevation as determined in s. NR 116.07 (4). All projects shall conform to the requirements of that chapter.

NR 811.63(2)(2) Grading. The area surrounding structures shall be graded in a manner that will prevent surface water from standing within 50 feet of the structure.

NR 811.63(3)(3) Year-round access. Storage facilities shall be located in an area accessible during the entire year. If necessary, road improvements shall be installed to provide year-round dry land access. Storage facilities and access roads shall be located on property owned by the water supply owner or for which the owner has obtained easements.

NR 811.63(4)(4) Floor elevations. The department recommends that the lowest elevations of floors and sump floors of ground level reservoirs and standpipes should be placed at or above the normal ground surface. If the department allows the floor or sump to be below the normal ground surface, it shall be placed a minimum of 2 feet above the groundwater table. Borings shall be made to determine groundwater elevations if that information is not available.

NR 811.63(5)(5) Contamination sources.

NR 811.63(5)(a)(a) Sewers, drains, fuel storage tanks, standing water, and similar sources of contamination shall be kept a minimum of 50 feet from the ground storage reservoir.

NR 811.63(5)(b)(b) The department may approve gravity or force main sewers within 50 feet of a ground storage reservoir if the sewer or force main is constructed of water main class pipe meeting the requirements under s. NR 811.69 and is pressure tested in place to meet the requirements under s. NR 811.12 (5) (d) 2.

NR 811.63(6)(6) Roof surface above grade.

NR 811.63(6)(b)(b) The department shall require a higher exposed elevation if high groundwater, poor surface drainage, or tight soils are encountered that will deter subsurface drainage or if necessary to provide positive pressures for pump intake or discharge lines in accordance with s. NR 811.37.