Conceptual Drainage Report SR 826/Palmetto Expressway Express Lanes FDOT Financial Project Identification Number: 432639-1-22-02 Efficient Transportation and Decision Making (ETDM) Number: 14308 Project Study Limits: From US 1/SR 5/Dixie Highway to SR 836/Dolphin Expressway Miami-Dade County, Florida Prepared for: FDOT District Six 1000 NW 111th Avenue Miami, Florida 33172 Prepared by: In Coordination with: RS&H, Inc. The Corradino Group 6303 Blue Lagoon Drive, Suite 325 4055 NW 97th Avenue Miami, FL 33126 Miami, FL 33178 AUGUST 2019 DRAFT SR 826/Palmetto Expressway Express Lanes PD&E Study Express Lanes Conceptual Drainage Report TABLE OF CONTENTS Executive Summary ................................................................................................................. 4 1.0 Project Description ....................................................................................................... 1 1.1 Conceptual Drainage Report Scope ................................................................... 2 2.0 Survey and Data Collection ........................................................................................ 2 2.1 Datum Conversion ................................................................................................. 5 2.1 Seasonal High Groundwater Table Elevation ...................................................... 5 3.0 Design Criteria and Parameters .................................................................................. 6 3.1 Stormwater Quality Criteria ................................................................................... 6 3.1.1 South Florida Water Management District (SFWMD) ................................................................................. 6 3.1.2 Miami-Dade Department of Regulatory and Economic Resources (DRER) ................................................. 7 3.2 Stormwater Quantity Criteria ................................................................................. 8 3.2.1 South Florida Water Management District (SFWMD) ................................................................................. 8 3.2.2 FEMA Floodplain ......................................................................................................................................... 9 3.3 Florida Department of Transportation (FDOT) ...................................................... 9 3.4 Stormwater Management System Design Criteria .............................................10 3.4.1 Detention Ponds ........................................................................................................................................ 10 3.4.2 Conveyance Systems ................................................................................................................................. 11 3.5 Total Maximum Daily Load (TDMLs) and Nutrient Impaired Water Bodies ...........12 3.6 Design Storms and Rainfall Depths ......................................................................13 3.7 Drainage Analysis Methodology ..........................................................................13 3.7.1 Drainage System Modeling ....................................................................................................................... 13 4.0 Permitting Requirements ............................................................................................ 15 5.0 Pre-Development Conditions .................................................................................... 17 5.1 System 1 .................................................................................................................17 5.2 System 2 .................................................................................................................17 5.3 System 3 .................................................................................................................19 5.4 System 4 .................................................................................................................20 5.5 System 5 .................................................................................................................21 5.6 System 6 .................................................................................................................21 5.7 System 7 .................................................................................................................22 5.8 System 7A ...............................................................................................................23 Conceptual Drainage -1 SR 826/Palmetto Expressway Express Lanes PD&E Study Express Lanes Conceptual Drainage Report 5.9 System 7B ...............................................................................................................23 5.10 System 8 .................................................................................................................24 5.11 System 9 .................................................................................................................25 5.12 System 10 ...............................................................................................................25 5.13 System 11 ...............................................................................................................26 5.14 System 12 ...............................................................................................................26 5.15 System 13 ...............................................................................................................27 5.16 System 14 ...............................................................................................................27 5.17 System 15 ...............................................................................................................28 5.18 System 16 ...............................................................................................................29 5.19 System 17 ...............................................................................................................29 5.20 System 18 ...............................................................................................................30 5.21 System 19 ...............................................................................................................30 5.22 System 20 ...............................................................................................................31 5.23 System 21 ...............................................................................................................32 6.0 Post-Development Conditions .................................................................................. 33 6.1 System 1 .................................................................................................................33 6.2 System 2 .................................................................................................................33 6.3 System 3 .................................................................................................................34 6.4 System 4 .................................................................................................................35 6.5 System 5 .................................................................................................................36 6.6 System 6 .................................................................................................................36 6.7 System 7 .................................................................................................................37 6.8 System 7A ...............................................................................................................37 6.9 System 7B ...............................................................................................................38 6.10 System 8 .................................................................................................................38 6.11 System 9 .................................................................................................................39 6.12 System 10, 11, 12 and 13 .......................................................................................40 6.13 System 14 ...............................................................................................................42 6.14 System 15 ...............................................................................................................42 6.15 System 16 ...............................................................................................................43 Conceptual Drainage -2 SR 826/Palmetto Expressway Express Lanes PD&E Study Express Lanes Conceptual Drainage Report 6.16 System 17 ...............................................................................................................43 6.17 System 18 ...............................................................................................................44 6.18 System 19 ...............................................................................................................44 6.19 System 20 ...............................................................................................................45 6.20 System 21 ...............................................................................................................45 7.0 Conclusions ................................................................................................................ 45 LIST OF APPENDICES Appendix A – Design Aids Figure 1…………………………………………………..…………….Project