City of Frisco Engineering Standards

Engineering Standards
B. The smallest pipe connection to water mains 20” and larger is 6”.
5.1.11 Backflow Prevention
Backflow prevention devices shall be required at the following locations in order to protect the public
water system from cross contamination:
A. Commercial property water service lines
B. Dedicated irrigation lines
C. Private fire service main supplying fire sprinkler systems
D. Multi-family residential water service lines
5.1.12 Automatic Flushing Valve
A. Automatic Flush Valves shall be placed on dead-end water mains. Water mains anticipated to be
extended in the future may be required to install an automatic flush valve, depending on the
timing of future work and the specific location.
B. Automatic Flush Valves shall drain via pipe to storm drain system.
C. Refer to Standard Detail for typical installation and Approved Material List for acceptable
products.
Section 5 – Water & Wastewater Design Requirements May 2012 Page 5-8