Sec. 2-3

Water Mains and Appurtenances

  (a) The subdivider shall install, in accordance with these rules and
      regulations and the standards of the department, and pay for the
      subdivision water system required for the subdivision.
         Main sizes shall be designed to deliver water in adequate quantities
      at adequate pressures for both (a) domestic use and irrigation under
      peak consumption conditions and (b) fire protection.
  (b) Size of water mains.
      (1) Urban districts.
          Current Standards of the Insurance Service Office's Guide for
          Determination of Required Fire Flows in effect at the time of the
          application shall be used as a guide in designing mains for fire
          flows.  The minimum size main from the point of adequacy to, along,
          and within the subdivision shall be as follows:
                                           Minimum Size of Water Main
            2 unit subdivision             1-1/2" limited to 200' run
                                           6" limited to 600' run
                                           8" if run is over 600'
            3 to 12 unit subdivision       4" limited to 200' run
                                           6" limited to 600' run
                                           8" if run is over 600'
            13 to 24 unit subdivision      6" limited to 600' run
                                           8" if run is over 600'
            25 unit subdivision and over   8" or larger as determined by
                                           design for domestic and fire
                                           protection requirements.
          Any subdivision having more than 200 feet of water main shall
          provide 6-inch water pipe or larger in residential district and
          8-inch water pipe or larger in business, industrial, hotel, and
          apartment districts.  A 6-inch main shall be used only where it
          completes a good gridiron and in no case in blocks more than 600
          feet in length.
      (2) Agricultural & Rural Zoned Areas.
                                           Minimum Size of Water Main
            2 unit subdivision             1-l/2" limited to 200' run
                                           4" limited to 1,000' run
                                           Over 1,000' size to be as deter-
                                           mined  by  design for domestic
                                           and agricultural requirements.
            3 to 6 unit subdivision        4" limited to 300' run
                                           6" limited to 1,200' run
                                           Over 1,200' size to be as deter-
                                           mined by design for domestic and
                                           agricultural requirements.
            7 to 24 unit subdivision       6" limited to 1,200' run
                                           Over 1,200' size to be as deter-
                                           mined by design for domestic and
                                           agricultural requirements.
            25 unit subdivision            8" or larger as determined by
                                           design for domestic and agricul-
                                           tural requirements.
  (c) Valves, pressure reducing units, etc., of such sizes, types, and
      classes shall be installed as designated and required by the director.