OFR 2004-1346
Prepared in cooperation with the
South Florida Water Management District
2004
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Abstract Introduction Relevance and Benefits Acknowledgments Urban Stormwater-Management Practices Overview of Agency Stormwater-Management Requirements Miami-Dade Department of Environmental Resources Management Roadways Community Stormwater Management South Florida Water Management District Water-Quantity Criteria Water-Quality Criteria Florida Department of Transportation Open Channels Storm Drains Stormwater Management Design of Exfiltration Trenches Agency Design Methodologies South Florida Water Management District Miami-Dade Department of Environmental Resources Management Florida Department of Transportation Alternative Exfiltration Trench Design Summary References Cited |
Agencies with jurisdiction over stormwater-management systems in Miami-Dade County, Florida, include the Miami-Dade Department of Environmental Resources Management (DERM), South Florida Water Management District (SFWMD), and Florida Department of Transportation (FDOT). These agencies are primarily concerned with minor drainage systems that handle runoff from storms with return periods of 10 years or less (DERM), major drainage systems that handle runoff from storms with return periods of 25 years or more (SFWMD), and runoff from major roadways (FDOT). All drainage regulations require retention of at least a specified water-quality volume (defined volume of surface runoff), typically the first inch of runoff. The DERM and FDOT intensity duration frequency (IDF) curves used as a basis for design are similar but different, with differences particularly apparent for short-duration storms. The SFWMD 25-year 3-day storm incorporates an IDF curve that is substantially different from both the IDF curves of DERM and FDOT. A DERM methodology for designing closed exfiltration systems is applicable to storms of 1-hour duration, but is not applicable to all storms with a given T-year return period. A trench design that is applicable to all storms with a given T-year return period is presented as an alternative approach.
Chin, D.A., 2004, An Overview of Urban Stormwater-Management Practices in Miami-Dade County, Florida: U.S. Geological Survey Open-File Report 2004-1346, 17 p.
U.S. Department of the Interior,
U.S. Geological Survey
Suite 1006
224 West Central Parkway
Altamonte Springs, FL 32714
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