City of Frisco Engineering Standards

Engineering Standards
5.1.5 Water Main Sizing
A. Water mains shall be sized in accordance with the Water Distribution System Master Plan.
B. The following criteria shall be used to size water mains.
1. Average daily water demands less than 80,000 gallons per day:
a. Single Family Residential
i. Water mains shall be a minimum of 8”.
ii. 12” water mains are required to serve the development and shall be located along
collector streets.
b. Multi-Family Residential
i. Water mains shall be a minimum of 8” and shall be extended to provide service to
adjacent properties.
ii. Water mains greater than 600’ in length or supplying more than one fire hydrant/fire
service line shall be 12”.
c. Commercial, Schools and Manufacturing
i. Looped 8” water mains may be used for fire hydrants located in parking lots and not
adjacent to buildings.
ii. Water mains greater than 1,000’ in length or supplying more than two fire
hydrants/fire service lines shall be a minimum of 12”.
2. Average daily water demands greater than 80,000 gallons per day shall submit the following
information:
a. Zoning
b. Area in acres
c. Type of Development
d. Number of units and/or building square footage
e. Exhibit with connection locations and proposed water main schematic
f. Projected Average Daily Water Demands
5.1.6 Water Main Materials
A. Polyvinyl Chloride (PVC) Pipe
1. PVC water mains from 4” to 8” in diameter shall be AWWA C900 DR14.
2. PVC water mains 12” in diameter shall be AWWA C900 DR18.
Section 5 – Water & Wastewater Design Requirements May 2012 Page 5-4