Water main sizes

A. Water main sizes shall be designed to deliver water quantities and pressure that meet department and the department of fire and public safety standards, for both domestic and irrigation uses under peak consumption conditions, as well as for fire protection. B. Size of Water Mains. 1. Urban and rural zoned districts. The standards of the "Insurance Service Office's Guide for Determination of Required Fire Flows" in effect at the time of a subdivision 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 a subdivision shall be as follows: Minimum Size of Water Main 2 unit subdivision 6″ limited to 600′ run 8″ if run is over 600′ 3 to 12 unit subdivision 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 and over unit subdivision 8″ or larger as determined by design for domestic and fire protection requirements.   All subdivisions shall provide six-inch water pipe or larger in residential district and eight-inch water pipe or larger in business, industrial, hotel, and apartment districts. A six-inch main shall be used only where it completes an adequate gridiron and in no case in blocks more than six hundred feet in length. 2. Agricultural zoned districts. Minimum Size of Water Main 2 unit subdivision 6″ limited to 1,200′ run; over 1,200′ size to be as determined by design for domestic and agricultural requirements. 3 to 6 unit subdivision 6″ limited to 1,200′ run; Over 1,200′ size to be as determined 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 determined by design for domestic and agricultural requirements. 25 and over unit subdivision 8″ or larger as determined by design for domestic and agricultural requirements.   C. Valves, pressure reducing units, etc., of such sizes, types and classes shall be installed as designated and required by the director. (Ord. No. 3730, § 1, 2010)