City of Frisco Engineering Standards

Engineering Standards
4. An emergency overflow path shall be provided on the plans for sag locations. An emergency
overflow path is the path the storm water will take if the drainage facility becomes clogged or
ceases to function as designed. The emergency overflow path must be located within public
right-of-way or within a drainage easement.
5. Curb inlet depth shall not be less than 4.5’ from top of curb for all public improvements.
6. Inlets are required at the low point of a superelevation to prevent flow across the roadway.
7. Multiple sag inlets shall be located no closer than 300’.
Section 4 – Drainage Design Requirements May 2012 Page 4-14