Southwest Florida Water Management District / Tampa Bay

Environmental Resource Permit Applicant's Handbook Volume II — Design Requirements for Stormwater Treatment and Management Systems: Water Quality and Water Quantity

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Open source PDF ↗Official agency page ↗

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Regional SWFWMD ERP Applicant's Handbook Vol II (Tampa Bay / SW Florida WMD), not a City of Tampa municipal manual. Source PDF appears draft (DRAFT/NEW DATE OCR artifacts and duplicated text). Numeric WQ depths also defer heavily to statewide AH Volume I; Vol II retains classic one-inch wet detention / half-inch retention-filtration-exfiltration sizing plus OFW +50%. Jurisdiction coded as county per task guidance.

Fields not found in document: design_criteria.required_hydrologic_hydraulic_software

Other manuals in Florida: Florida, South Florida Water Management District / Miami-Dade, Suwannee River Water Management District / Gainesville (north-central Florida)

Document Metadata

Jurisdiction level

county

“This Volume II ... is intended for use only within the jurisdictional boundaries of the Southwest Florida Water Management District.”
Section 1.0 Introduction

State

Florida

“administration of Chapter 62-330, Florida Administrative Code (F.A.C.).”
Section 1.0 Introduction

Version / edition

Effective June 1, 2018 (draft text with NEW DATE markers)

“EFFECTIVE June 1, 2018NEW DATE”
Title Page

Adoption / effective date

2018-06-01

“EFFECTIVE June 1, 2018”
Title Page

Last revised date

2018-06-01

“EFFECTIVE June 1, 2018”
Title Page

Relationship to state manual

independent

“Each Water Management District has adopted an ERP Applicant's Handbook Volume II ... District-specific design and performance criteria for stormwater quantity or, flood control systems, design criteria for stormwater quality systems”
Section 1.0 Introduction

Design Criteria

Design storm return periods (years)

25-year, 100-year

“off-site discharges and peak stages for the existing and developed conditions shall be computed using the Southwest Florida Water Management District's 24-hour, 25-year rainfall maps and the Natural Resources Conservation Service type II Florida Modified 24-hour rainfall distribution”
Section 3.1 Discharges

Water quality volume method

District Vol. II criteria work with statewide ERP Applicant's Handbook Volume I performance standards: wet detention sized for one inch of runoff from the contributing area; retention, effluent filtration, or exfiltration sized for one-half inch of runoff (or, for several BMP types, treat runoff from the first one inch of rainfall, with an option for drainage areas under 100 acres of the first one-half inch of runoff). Treatment volume must again be available within 72 hours (only the portion recoverable in 36 hours may count toward quantity storage). Direct OFW discharges require 50% more treatment volume than the selected system.

“The required water quality system must have treatment capacity for one inch of runoff if wet detention is used, or one-half inch of runoff if retention, effluent filtration or exfiltration is used, from the total developed site and contributing offsite area.”
Section 3.5 / water quality capacity

Peak flow calculation method(s)

Historic peak discharge or legally allowable discharge (open basins), NRCS Type II Florida Modified 24-hour rainfall distribution with AMC II on SWFWMD 24-hour/25-year (open) or 24-hour/100-year (closed) rainfall maps, Soil Conservation Service / NRCS National Engineering Handbook Section 4 hydrology methods, Rainfall minus losses and storage, Rational method (projects less than 10 acres total contributing area), USDA-SCS TR-55 Urban Hydrology for Small Watersheds / Technical Paper No. 149 (infiltration)

“historic discharge, which is the peak rate at which runoff leaves a parcel of land by gravity under existing site conditions, or the legally allowable discharge at the time of permit application”
Section 3.1.a

Required hydrologic/hydraulic software

Not found in document

No evidence cited

Approved BMP categories

Wet detention systems, Detention with effluent filtration (manmade underdrains), On-line retention treatment systems, Off-line retention treatment systems, Underground exfiltration treatment systems, Dry grassed swales / sediment-oil-grease pretreatment, Sensitive karst area stormwater systems

“a. Wet Detention Systems ... b. Detention with Effluent Filtration System (Manmade Underdrains) ... c. On-line Treatment Systems ... d. Off-line Treatment Systems ... e. Underground Exfiltration Systems”
Part IV Table of Contents / Section 4.1