What is the design storm for my project?
The County Title 9 (Title 9: 911-2.010) set the design storm based on the watershed area draining to the creek of drainage facility as follows:
  • Area < 1.0 sq. mi. Contain, with sufficient freeboard, a ten year frequency of average recurrence interval (10-year)

  • 1.0 sq. mi. ≤ Area ≤ 4 sq. mi. Contain, with sufficient freeboard, a 25-year frequency of average recurrence interval (25-year)

  • 4.0 sq. mi.≥ Area Contain, with sufficient freeboard, a 50-year frequency of average recurrence interval (50-year) OR Contain the 100-year frequency of average recurrence interval (100-year)

Public Works Flood Control

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1. What is the design storm for my project?
2. Why do we need a permit to work in the creek?
3. What is the drainage easement across my property for? Can I build on it? What can I do on it?
4. Are there more Frequently Asked Questions?