Suwannee River Water Management District / Gainesville (north-central Florida)

Environmental Resource Permit Applicant's Handbook Volume II (Design Requirements for Stormwater Treatment and Management Systems)

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Regional SRWMD ERP Applicant's Handbook Vol II (north-central Florida; Gainesville/Alachua is within district rainfall tables). Not a City of Gainesville municipal manual. Numeric first-flush inch depths live primarily in statewide AH Volume I; Vol II specifies recovery times, design storms (10-yr ag/recreation; 100-yr critical duration otherwise; Appendix B includes 10/25/100-yr depths), and BMP design. Jurisdiction coded as county per task guidance. Section 2.7 states no specified computer-model list.

Fields not found in document: design_criteria.required_hydrologic_hydraulic_software

Other manuals in Florida: Florida, South Florida Water Management District / Miami-Dade, Southwest Florida Water Management District / Tampa Bay

Document Metadata

Jurisdiction level

county

“Such systems are regulated by the Suwannee River Water Management District (District) through the ERP program authorized under Section 373.4145, F.S.”
Section 1.1.1 Introduction

State

Florida

“Incorporated by Reference in Rules 62-330.010 and 40B-400.091, F.A.C.”
Title Page

Version / edition

Effective July 2024

“Effective July 2024”
Title Page

Adoption / effective date

2024-07

“Effective July 2024”
Title Page

Last revised date

2024-07

“Effective July 2024”
Title Page

Relationship to state manual

independent

“This Volume provides specific, detailed information to meet the water quality system and quantity design requirements of stormwater management systems. ... Both Applicant's Handbook Volumes I and II are adopted by reference in Chapter 62-330, F.A.C.”
Section 1.1.1 Introduction

Design Criteria

Design storm return periods (years)

10-year, 25-year, 100-year

“For projects which serve exclusively agricultural, forest, conservation, or recreational land uses, a design storm with a 10-year, 24-hour rainfall depth with SCS type II distribution ... shall be used. For projects which serve all other land uses, a design storm with 100-year critical duration rainfall depth with SCS type II distribution ... shall be used.”
Section 3.2 Design Storms

Water quality volume method

Minimum State water quality treatment requirements are those in statewide ERP Applicant's Handbook Volume I; Volume II requires all systems to recover treatment volumes within 72 hours (retention may use only percolation and evaporation; detention with filtration needs a safety factor of two). Quantity retention in closed basins is post- minus pre-development runoff for the 100-year critical event (max one-day duration). Flood storage recovery: one-half of total volume within seven days and total volume within 30 days after each design storm.

“All stormwater management systems must be designed to provide minimum State water quality treatment requirements as set forth in Applicant's Handbook Volume I.”
Section 4.3 State Water Quality Standards

Peak flow calculation method(s)

Pre- and post-development runoff hydrographs with detention/retention routing (stage-storage-discharge), Rational Method, Natural Resources Conservation Service (NRCS) method, USGS regression equations, SCS Type II distribution on average antecedent moisture conditions, Peak Rate Factor (K') method (conservative post-development K'=484)

“There are several equations available for calculating discharge including, but not limited to, the Rational Method, Natural Resources Conservation Service (NRCS) method, and USGS regression equations.”
Section 3.3.1 Methodologies for Calculating Discharge

Required hydrologic/hydraulic software

Not found in document

No evidence cited

Approved BMP categories

Retention ponds, Dry detention ponds, Exfiltration trench systems, Wet detention ponds, Swale systems, Vegetated natural buffers, Borrow pits and ponds, Dams and impoundments, Sensitive karst area BMPs

“The Best Management Practices (BMP)s below are the most frequently used BMPs in this District.”
Part V – Best Management Practices