City of Frisco Engineering Standards

Engineering Standards
Water features and detention facilities with permanent pools must obtain a TCEQ water rights
permit if applicable. Refer to TCEQ for water rights regulations.
For permanent pool ponds without a water rights permit, the Engineer shall provide a signed
statement to the City stating the water rights permit is not required.
4.10 Miscellaneous Drainage Requirements
A. Lot Drainage - Lot to lot surface drainage is prohibited. Pad elevations shall be no less than 12”
above curb elevation. Figure 4 is provided below for reference when performing lot grading
designs. Lot grading type and finished floor elevations shall be shown on the construction plans.
Type B and Type C Lot Grading must back to alleys, open space, or drainage easement. Type C
Lot Grading may only be used with approval of Engineering Service. Refer to the International
Residential Building Code (IRC) Section 401.3 (latest version) for additional requirements.
Figure 4
Typical Lot Grading Patterns
B. Storm Drain Materials
1. All public storm sewers shall be reinforced concrete.
2. All storm sewers under a fire lane or roadway and within a drainage easement shall be
reinforced concrete. Any structure under a fire lane must be designed to withstand applicable
loadings, including loading of a fire apparatus.
C. The minimum finished floor elevation for any lot adjacent to a drainage feature shall be 2’ above
the adjacent 100 year fully developed water surface elevation and shall be shown on the final plat.
Section 4 – Drainage Design Requirements May 2012 Page 4-28