Exhibit_E9_-_Surface_Water_Management_Report_for_Phase_II-_Pending_Review_and_SS.pdf

Veterans Memorial Boulevard Phase 2

Surface Water Management Calculations

Prepared for:

Collier County Board of Commissioners 3299 Tamiami Trail East, Suite 303

Naples, FL 34112-5746

Prepared By:

6610 Willow Park Drive Suite 200

Naples, FL 34109

Dated: July 2024

Laurie A. Swanson, P.E.

Florida License No. 40254

VETERANS MEMORIAL BOULEVARD PHASE 2 SURFACE WATER MANAGEMENT CALCULATIONS

TABLE OF CONTENTS

Section I – Summary of Design

Section II – Calculations

Staff Report Data On-Site Land Use Calculations Sub-Basin Calculations Water Quality Calculations Flood Plain Management Calculations Nutrient Loading Analysis

Section III– Input Data for ICPR Modeling

Section IV – ICPR Modeling Results

25 Year – 3 Day Storm Event Model Node Maximum Conditions Link Maximum Conditions Node Time Series to 15 days

100 Year – 3 Day Storm Event Model (With Discharge)

Node Maximum Conditions Link Maximum Conditions

SECTION I

PROJECT PURPOSE

This application is a request for an Individual Environmental Resource Permit authorizing the construction and operation of a surface water management system serving ±58.1 acres of right-of-way known as Veterans Memorial Boulevard Phase 2. Veterans Memorial Boulevard Phase 2 is an extension and modification of the constructed Phase 1 roadway approved under ERP No. 11-102981- P, Application No. 210419-5949, for a total of ±88.7 acres for the Veterans Memorial Blvd surface water management system.

PROJECT SITE DESCRIPTION

The general project location begins to the west of the new high school entrance on the Veterans Memorial Boulevard Phase 1 roadway and ends at US 41 with undeveloped wetlands located west of Old 41 in Naples, Florida. Currently, there is approximately 6,900 linear feet of four-lane roadway constructed under Phase 1 from the new high school east to Livingston Rd.

EXISTING DRAINAGE CONDITIONS

The existing drainage for the project site is shown on the Existing Drainage Map within the plans.

Currently the four-lane roadway discussed above is included in one (1) major basin separated into three (3) sub-basins and is permitted under ERP No. 11-102981-P. The runoff from the roadway is stored in either an on-site lake or dry detention pond to allow for water quality and attenuation. Each drainage basin within Phase 1 is controlled at an elevation of 10.50 ft NAVD.

The Mediterra development, to the north of the right of way, was originally permitted under ERP No.

11-01761-P, Application No. 990126-4. As part of Veterans Phase 1 a 48” pipe from Mediterra control structure #2 in lake #24 connects to a junction box located in the 20 ft drainage easement and is routed through a 48” pipe to the east and south around the wet detention lake in Phase 1. This 48” pipe discharges to the same drainage easement within the Imperial Golf Estates site that the existing flow went to and splits flows to the east and south. This was not combined with the Phase 1 SWM system and will not be combined with the Phase 2 SWM system as the flows have already been treated on the Mediterra parcel.

The undeveloped portion of the Veterans Memorial Boulevard right of way between the railroad tracks and the Phase 1 western limits currently flows to the south in a ditch constructed to carry the Mediterra discharges from DA #2 and then discharges directly via surface flow into the ditch along the north side of the Imperial Golf Estates development.

Stormwater from the Veterans Memorial Boulevard right of way west of the railroad tracks is controlled at 8.50 ft NAVD and drains south to Wiggins Bay. This is done via existing ditches along US 41, Old 41, and the western boundary of the Conservation Collier parcel.

PROPOSED PROJECT

The project will consist of a four-lane divided roadway extension with turn lanes for the Old 41 and US 41 intersections. Approximately 4,950 linear feet of four-lane divided roadway will be extended to the west to connect the new high school to Old 41. Another ±1,550 linear feet of four-lane divided roadway will connect the Veterans Memorial Blvd intersection at Old 41 with US 41 to the west. The result will be approximately 6,500 linear feet of four-lane divided roadway.

The Veterans Memorial Boulevard Water Management System consists of three (3) major basins divided into thirteen (13) sub-basins. Each basin will include an on-site lake or dry detention pond to allow for water quality and attenuation. The sub-basins east of the railroad tracks (Basin 1) are controlled at an elevation of 10.50 ft NAVD. The sub-basins west of the railroad tracks (Basin’s 2 &

3) are controlled at an elevation of 8.50 ft NAVD. The control elevation for Basin 1 east of the railroad tracks was determined from the existing ERP (Permit No. 11-102981-P) for Veterans Memorial Boulevard Phase 1. The control elevation for Basin’s 2 & 3 west of the railroad tracks was determined from existing ERP’s for adjacent parcels and ultimately matches the control elevation utilized for the Mercedes Benz of Bonita Springs ERP (Permit No. 11-03669-P). Run-off from each basin will be conveyed via sheet flow to curb inlets to wet and dry detention ponds within each basin.

LAND USE

See “Staff Report Data” in Section II of this report for the land use breakdown.

DISCHARGE

Allowable discharge for this project is limited to 0.12 cfs per acre for the basins east of the railroad (Imperial Drainage Outlet Basin) and 0.13 cfs per acre for basins west of the railroad (Wiggins Bay Outlet Basin) as specified in the Collier County Stormwater Ordinance 2017-19.

The existing control structure from the Veterans Memorial Boulevard Phase 1 SWM system will be removed and replaced with the proposed control structure (CS-1) in the expanded Phase 1 wet detention pond. The existing 24” RCP pipe will convey discharge to a swale that ultimately leads to the canal on the east side of Imperial Golf Estates residential community. While no impacts are expected for the Mediterra SWM system, the proposed improvements to the Veterans Memorial Boulevard SWM system will require a modification to the Phase 1 ERP (Permit No. 11-102981-P).

The existing control structure for the Triangle Parcel will be removed and replaced with a proposed control structure (CS-TP3) in the same location and convey discharge through an 18” RCP pipe to the wetlands east of the Triangle Parcel. A modification to the Triangle Parcel ERP (Permit No. 11- 02353-P) will be required for the proposed improvements. The wetlands drain to the existing ditch along Old 41 which ultimately crosses US 41 at the intersection.

A third proposed control structure (CS-CC4) will convey discharge from proposed Wet Detention Pond #2 to the existing ditch within the 100 ft FPL easement known as the Imperial West Landmark FPL Ditch (Permit No. 11-01540-P) along the east boundary of the Landmark Estates (Permit No. 11- 00178-S).

RECEIVING BODY

The portion of the project located east of the railroad flows through the Imperial Golf Estates SWM system and ultimately outfalls to the Cocohatchee River via a canal on the south side of Imperial Golf Estates. The tailwater used for the hydraulic modeling was estimated based on hydraulic conditions within the Imperial Golf Estates system.

Stormwater from Basin 2 located west of the railroad and east of Old 41 will flow south via the Imperial West Landmark FPL Ditch and cross US 41 via the Imperial Drainage Outfall stream and outfall to the Cocohatchee River. Stormwater from Basin 3 located west of Old 41 will flow through roadside ditches along Old 41, Tarpon Cove Drive, and Gulf Harbor Drive before the outfall to the Cocohatchee River south of Wiggins Pass Road. The tailwater used for the hydraulic modeling was estimated on assumptions made for the ditch along the Old 41 roadway.

WATER QUALITY

The proposed wet and dry detention ponds will provide water quality for the project. An additional 50% above the required water quality volume of 1 inch over the basin area is provided to meet the anti-degradation requirements for discharge to an OFW.

The proposed roadway will require the removal of the Mercedes Benz existing dry detention area within the 90 ft reservation area for the Veteran’s Memorial Boulevard right of way. The dry detention area along the eastern boundary of the Mercedes Benz development will provide the 0.5 inch dry pretreatment volume required prior to discharging through the proposed control structure (CS-MB2) to proposed Wet Detention Pond #2. A modification to the Mercedes Benz ERP (Permit No. 11-03669- P) will be required for the proposed improvements.

IRRIGATION WATER SOURCE

Collier County will be using water from the proposed 12” water main to be installed as a part of this project for irrigation water. No water use permit will be required.

Collier County Stormwater Management Facilities

Collier county GMD, State of Florida, Maxar

6/18/2024 0 0.4 0.80.2 mi

0 0.65 1.30.33 km

1:27,046

SECTION II

Calculations

East of Railroad

Basin 1

Project

Proj. #: 190062.00.01 Task # 014 Calculated By: NDG Date: 11-Jun-24

Checked By: LAS Date: 11-Jun-24

Contents:

- Staff Report Data

- On-Site Land Use Calculations

- Sub-Basin Calculations

- Water Quality Calculations

Veterans Memorial Blvd Improvements Phase 2 - East of Railroad Water Management Calculations

Veterans Memorial Blvd Improvements Phase 2

Proj. #: 190062.00.01 Task # 014 Calculated By: NDG Date: 11-Jun-24

Checked By: LAS Date: 11-Jun-24

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The following water quality calculations will show storage elevation for the first inch of storm water runoff or 2.5 times the percent impervious, whichever is greater. The bleeder will be designed to allow 1/2" discharge over a 24 hour period.

Veterans Memorial Blvd Improvements Phase 2

Veterans Memorial Blvd Improvements Phase 2 - East of Railroad Water Management Calculations

Assumptions

The Control Elevation is set at 10.50 ft NAVD based on wet season water nails The subject property consists of 44.37 acres.

The Drainage Area will consist of 44.37 acres.

Average depth to water level is ± 3.80 ft. Refer to "Water Quality Calculations" and "Lake and Basin Storage Calculations."

Soil compaction factor = 25%.

East Basin is inclusive of Phase 2 Sub-Basin 1-DE, Phase 2 Sub-Basin 1-LE, Phase 1 Sub-Basin 2, Phase 1 Sub-Basin 3, and Phase 1 Sub-Basin 4.

The site is located within the Cocohatchee River Basin according to the "Allowable Discharge Rates for Projects in the South Florida Water Management Distict."

An additional 50% water quality volume will be provided according to the SFWMD policy for discharge to sensitive receiving waters.

From Figure C-9 25-year 1-day = 11.50 inches.

There will be a berm constructed around the water management system (Drainage Area) , with a minimum crest elevation set at the 25-year 3-day peak. Onsite indigenous preserve and canal maintenance easement areas will be outside of the Drainage Area.

Based on SFWMD Environmental Resource Permit Applications Handbook, Volume II - Using Method 1, the Rainfall Amounts chosen for the design are:

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Water Quantity Discharge Rate:

Discharge Storm Frequency 25 year - 3day Design Rainfall: 11.55 in.

East Basin 5.32 0.12 5.23 13.27

Road Design:

Discharge Storm Frequency 25 year - 3day Design Rainfall: 11.55 in.

Phase 2 Sub-Basin 1-DE 13.26 13.40 Phase 2 Sub-Basin 1-LE 13.25 13.40 Phase 1 Sub-Basin 2 13.26 13.40 Phase 1 Sub-Basin 3 13.26 13.40 Phase 1 Sub-Basin 4 13.27 13.40

Berm Design:

Discharge Storm Frequency 100 year - 3day (w/ Discharge) Design Rainfall: 15.00 in.

Phase 2 Sub-Basin 1-DE 14.18 14.20 *Elevation Needed for Floodplain Comp Phase 2 Sub-Basin 1-LE 14.18 14.20 Phase 1 Sub-Basin 2 14.18 14.20 Phase 1 Sub-Basin 3 14.18 14.20 Phase 1 Sub-Basin 4 14.18 14.20

Water Quality / Discharge Structures:

Orifice (Circular) 0.42 0.42 10.50 Rectangular Weir 1.50 0.50 11.66

Rectangular Weir (Horizontal) 3.08 4.08 13.40

Water Quality

6.00 6.02

Basin Peak Stage (ft, NAVD)

Proposed Berm Elevation (ft, NAVD)*

Wet/Dry Detention

Basin

Treatment Method Vol Req'd (ac-ft)

Phase 1 Sub-Basin 2

Veterans Memorial Blvd Improvements Phase 2 - East of Railroad Staff Report Data

Allow Disch (cfs) Method of Determination (cfs/ac) Peak Disch (cfs)

Peak Stage Modeled (ft, NAVD)

Minimum Vol Prov'd (ac-ft)

Peak Stage (ft, NAVD)

Height (feet) Invert Elev. (ft, NAVD)Width (feet)Str # Type

Proposed Min. Road Crown (ft, NAVD)

CS-1

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Total Sub-Basin Area (Ac) 8.23 19.51 0.89 9.71 6.03 44.37

Total Pavement/Sidewalk 4.45 54% 9.57 49% 0.66 74% 4.53 47% 0.00 0% 19.21 43%

Lake @ Control 0.00 0% 0.00 0% 0.00 0% 0.00 0% 4.23 70% 4.23 10% Total Pervious Area2 3.78 46% 9.94 51% 0.23 26% 5.18 53% 1.80 30% 20.93 47%

Lake Slope Area 0.00 0% 0.00 0% 0.00 0% 0.00 0% 0.74 12% 0.74 2%

Dry Detention Bottom 1.43 17% 3.64 19% 0.00 0% 0.69 7% 0.00 0% 5.76 13% Dry Detention Slope Area 0.85 10% 2.30 12% 0.00 0% 0.58 6% 0.00 0% 3.73 8%

Total Sub-Basin Area (Ac) 8.23 100% 19.51 100% 0.89 100% 9.71 100% 6.03 100% 44.37 100%

Notes

1. Areas for Phase 1 Sub‐Basin's 2 through 4 based on approved ERP Permit No. 11‐102981‐P, App. No. 210419‐5949

2. Total Pervious Area is inclusive of Lake Slope Area, Dry Detention Bottom, and Dry Detention Slope Area

Veterans Memorial Blvd Improvements Phase 2 - East of Railroad

DRAINAGE BASIN LAND USE

Phase 1

Sub-Basin 41

Phase 1

Sub-Basin 31

Phase 1

Sub-Basin 21 Drainage Basin Total Phase 2

Sub-Basin 1-DE Phase 2

Sub-Basin 1-LE

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Average Site Grade Avg Elev. Area

Open Space* 14.95 16.00 15.48 1.50 Roadway 14.95 16.00 15.48 4.45 Lake Bank 10.50 13.40 11.95 0.00 Detention Bank 11.50 14.20 12.85 0.85

6.80 Avg Site Grade =

Soil Storage

Sub-Basin Area 8.23 Pervious Area 2.35 Average Site Grade (ft) 15.15 Control Elevation (ft) 10.5 Average Depth to Water Table (ft) 4.65 Soil Compaction Factor (i.e. 25%) 25% Developed Storage Available (in) 8.18 From SFWMD; Basis for Review, Volume IV Available Soil Storage 1.60 (Developed Storage Available) x (Pervious Area)/(12 inches/ft) Site-Wide Soil Storage (S) 2.34 (Available Soil Storage/Site Area) x (12 inches/ft) CN for Sub-Basin 81.07 CN = 1,000 /(S + 10)

Stage Storage Stage - Area (Ac.)

Area 10.50 11.50 12.50 13.40 14.20 14.95 16.00 Lake 10.5 13.8 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Detention 11.5 14.2 1.43 0.00 1.43 1.43 1.43 1.43 1.43 1.43 Open Space* 15.0 16.0 1.50 0.00 0.00 0.00 0.00 0.00 0.00 1.50 Roadway 15.0 16.0 4.45 0.00 0.00 0.00 0.00 0.00 0.00 4.45 Lake Bank 10.5 13.4 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Detention Bank 11.5 14.2 0.85 0.00 0.00 0.31 0.60 0.85 0.85 0.85

8.23 0.00 1.43 1.74 2.03 2.28 2.28 8.23

Stage-Volume AF Area 10.50 11.50 12.50 13.40 14.20 14.95 16.00

Detention 11.5 13.8 1.43 0.00 0.00 1.43 2.72 3.86 4.93 6.44 Open Space* 15.0 16.0 1.50 0.00 0.00 0.00 0.00 0.00 0.00 0.79 Roadway 15.0 16.0 4.45 0.00 0.00 0.00 0.00 0.00 0.00 2.34 Detention Bank 11.5 14.2 0.85 0.00 0.00 0.16 0.57 1.15 1.79 2.68

8.23 0.00 0.00 1.59 3.29 5.01 6.72 12.24

Elevation Range

Elevation Range

23.21 68.86 0.00

103.00 15.15

10.92

Elevation Range Area x Avg Elev.

Veterans Memorial Blvd Improvements Phase 2 - East of Railroad

PHASE 1 SUB-BASIN 4 CALCULATIONS

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Open Space* 13.41 14.98 14.20 4.00 Roadway 13.41 14.98 14.20 9.57 Lake Bank 10.50 13.40 11.95 0.00 Detention Bank 11.50 13.40 12.45 2.30

15.87 Avg Site Grade =

Soil Storage

Sub-Basin Area 19.51 Pervious Area 6.30 Average Site Grade (ft) 13.94 Control Elevation (ft) 10.5 Average Depth to Water Table (ft) 3.44 Soil Compaction Factor (i.e. 25%) 25% Developed Storage Available (in) 6.59 From SFWMD; Basis for Review, Volume IV Available Soil Storage 3.46 (Developed Storage Available) x (Pervious Area)/(12 inches/ft) Site-Wide Soil Storage (S) 2.13 (Available Soil Storage/Site Area) x (12 inches/ft) CN for Sub-Basin 82.46 CN = 1,000 /(S + 10)

Stage Storage Stage - Area (Ac.)

Area 10.50 11.50 12.50 13.40 14.20 14.95 16.00 Lake 10.5 13.4 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Detention 11.5 13.4 3.64 0.00 3.64 3.64 3.64 3.64 3.64 3.64 Open Space* 13.4 15.0 4.00 0.00 0.00 0.00 0.00 2.01 3.92 4.00 Roadway 13.4 15.0 9.57 0.00 0.00 0.00 0.00 4.82 9.39 9.57 Lake Bank 10.5 13.4 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Detention Bank 11.5 13.4 2.30 0.00 0.00 1.21 2.30 2.30 2.30 2.30

19.51 0.00 3.64 4.85 5.94 12.77 19.25 19.51

Stage-Volume AF Area 10.50 11.50 12.50 13.40 14.20 14.95 16.00

Detention 11.5 13.4 3.64 0.00 0.00 3.64 6.92 9.83 12.56 16.38 Open Space* 13.4 15.0 4.00 0.00 0.00 0.00 0.00 0.80 3.02 7.22 Roadway 13.4 15.0 9.57 0.00 0.00 0.00 0.00 1.90 7.23 17.27 Detention Bank 11.5 13.4 2.30 0.00 0.00 0.61 2.19 4.03 5.75 8.17

19.51 0.00 0.00 4.25 9.10 16.55 28.56 49.04

56.78

Veterans Memorial Blvd Improvements Phase 2 - East of Railroad

PHASE 1 SUB-BASIN 3 CALCULATIONS

Elevation Range Area x Avg Elev.

Elevation Range

135.85 0.00 28.64

221.26 13.94

Elevation Range

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Open Space* 13.63 14.32 13.98 0.23 Roadway 13.63 14.32 13.98 0.66 Lake Bank 10.50 13.40 11.95 0.00 Detention Bank 11.50 13.40 12.45 0.00

0.89 Avg Site Grade =

Soil Storage

Sub-Basin Area 0.89 Pervious Area 0.23 Average Site Grade (ft) 13.98 Control Elevation (ft) 10.5 Average Depth to Water Table (ft) 3.48 Soil Compaction Factor (i.e. 25%) 25% Developed Storage Available (in) 6.71 From SFWMD; Basis for Review, Volume IV Available Soil Storage 0.13 (Developed Storage Available) x (Pervious Area)/(12 inches/ft) Site-Wide Soil Storage (S) 1.73 (Available Soil Storage/Site Area) x (12 inches/ft) CN for Sub-Basin 85.23 CN = 1,000 /(S + 10)

Stage Storage Stage - Area (Ac.)

Area 10.50 11.50 12.50 13.40 14.20 14.95 16.00 Lake 10.5 13.4 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Detention 11.5 13.4 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Open Space* 13.6 14.3 0.23 0.00 0.00 0.00 0.00 0.19 0.23 0.23 Roadway 13.6 14.3 0.66 0.00 0.00 0.00 0.00 0.55 0.66 0.66 Lake Bank 10.5 13.4 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Detention Bank 11.5 13.4 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

0.89 0.00 0.00 0.00 0.00 0.74 0.89 0.89

Stage-Volume AF Area 10.50 11.50 12.50 13.40 14.20 14.95 16.00

Lake 10.5 13.4 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Open Space* 13.6 14.3 0.23 0.00 0.00 0.00 0.00 0.05 0.22 0.47 Roadway 13.6 14.3 0.66 0.00 0.00 0.00 0.00 0.16 0.64 1.34 Lake Bank 10.5 13.4 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

0.89 0.00 0.00 0.00 0.00 0.21 0.87 1.80

3.21

Veterans Memorial Blvd Improvements Phase 2 - East of Railroad

PHASE 1 SUB-BASIN 2 CALCULATIONS

Elevation Range Area x Avg Elev.

Elevation Range

9.22 0.00 0.00 12.44

13.98

Elevation Range

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Open Space* 13.63 13.40 13.52 3.91 Roadway 13.63 14.63 14.13 4.53 Lake Bank 10.50 13.40 11.95 0.00 Detention Bank 11.50 13.40 12.45 0.58

9.02 Avg Site Grade =

Soil Storage

Sub-Basin Area 9.71 Pervious Area 4.49 Average Site Grade (ft) 13.76 Control Elevation (ft) 10.5 Average Depth to Water Table (ft) 3.26 Soil Compaction Factor (i.e. 25%) 25% Developed Storage Available (in) 5.89 From SFWMD; Basis for Review, Volume IV Available Soil Storage 2.21 (Developed Storage Available) x (Pervious Area)/(12 inches/ft) Site-Wide Soil Storage (S) 2.73 (Available Soil Storage/Site Area) x (12 inches/ft) CN for Sub-Basin 78.58 CN = 1,000 /(S + 10)

Stage Storage Stage - Area (Ac.)

Area 10.50 11.49 11.50 12.50 13.40 14.20 14.95 16.00 Lake 10.5 13.4 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Detention 11.5 13.4 0.69 0.00 0.00 0.69 0.69 0.69 0.69 0.69 0.69 Open Space* 13.6 13.4 3.91 0.00 0.00 0.00 0.00 0.00 3.91 3.91 3.91 Roadway 13.6 14.6 4.53 0.00 0.00 0.00 0.00 0.00 2.58 4.53 4.53 Lake Bank 10.5 13.4 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Detention Bank 11.5 13.4 0.58 0.00 0.00 0.00 0.31 0.58 0.58 0.58 0.58

9.71 0.00 0.00 0.69 1.00 1.27 7.76 9.71 9.71

Stage-Volume AF Area 10.50 11.49 11.50 12.50 13.40 14.20 14.95 16.00

Detention 11.5 13.4 0.69 0.00 0.00 0.00 0.69 1.31 1.86 2.38 3.11 Open Space* 13.6 13.4 3.91 0.00 0.00 0.00 0.00 0.00 2.68 5.61 9.72 Roadway 13.6 14.6 4.53 0.00 0.00 0.00 0.00 0.00 0.74 3.71 8.47 Detention Bank 11.5 13.4 0.58 0.00 0.00 0.00 0.15 0.55 1.02 1.45 2.06

9.71 0.00 0.00 0.00 0.84 1.86 6.29 13.16 23.35

52.84

Veterans Memorial Blvd Improvements Phase 2 - East of Railroad

PHASE 2 SUB-BASIN 1-DE CALCULATIONS

Elevation Range Area x Avg Elev.

Elevation Range

64.01 0.00 7.22

124.07 13.76

Elevation Range

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Open Space* 13.63 13.40 13.52 1.06 Roadway 13.63 14.63 14.13 0.00 Lake Bank 10.50 13.40 11.95 0.74 Detention Bank 11.50 13.40 12.45 0.00

1.80 Avg Site Grade =

Soil Storage

Sub-Basin Area 6.03 Pervious Area 1.80 Average Site Grade (ft) 12.87 Control Elevation (ft) 10.5 Average Depth to Water Table (ft) 2.37 Soil Compaction Factor (i.e. 25%) 25% Developed Storage Available (in) 3.01 From SFWMD; Basis for Review, Volume IV Available Soil Storage 0.45 (Developed Storage Available) x (Pervious Area)/(12 inches/ft) Site-Wide Soil Storage (S) 0.90 (Available Soil Storage/Site Area) x (12 inches/ft) CN for Sub-Basin 91.76 CN = 1,000 /(S + 10)

Stage Storage Stage - Area (Ac.)

Area 10.50 11.49 11.50 12.50 13.40 14.20 14.95 16.00 Lake 10.5 13.4 4.23 4.23 4.23 4.23 4.23 4.23 4.23 4.23 4.23 Detention 11.5 13.4 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Open Space* 13.6 13.4 1.06 0.00 0.00 0.00 0.00 0.00 1.06 1.06 1.06 Roadway 13.6 14.6 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Lake Bank 10.5 13.4 0.74 0.00 0.25 0.26 0.51 0.74 0.74 0.74 0.74 Detention Bank 11.5 13.4 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

6.03 4.23 4.48 4.49 4.74 4.97 6.03 6.03 6.03

Stage-Volume AF Area 10.50 11.49 11.50 12.50 13.40 14.20 14.95 16.00

Lake 10.5 13.4 4.23 0.00 4.19 4.23 8.46 12.27 15.65 18.82 23.27 Open Space* 13.6 13.4 1.06 0.00 0.00 0.00 0.00 0.00 0.73 1.52 2.63 Roadway 13.6 14.6 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Lake Bank 10.5 13.4 0.74 0.00 0.13 0.13 0.51 1.07 1.67 2.22 3.00

6.03 0.00 4.31 4.36 8.97 13.34 18.04 22.56 28.90

14.33

Veterans Memorial Blvd Improvements Phase 2 - East of Railroad

PHASE 2 SUB-BASIN 1-LE CALCULATIONS

Elevation Range Area x Avg Elev.

Elevation Range

0.00 8.84 0.00 23.17

12.87

Elevation Range

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Sub-Basin 1-DE 11.5 13.4 13.76 9.02 Sub-Basin 1-LE 10.5 14.6 12.87 1.80

10.82 147.24 *Does Not Include Building Area Avg Site Grade = Soil Storage

Sub-Basin Area 10.82 Pervious Area 6.29 Average Site Grade (ft) 13.61 Control Elevation (ft) 10.5 Average Depth to Water Table (ft) 3.11 Soil Compaction Factor (i.e. 25%) 25% Developed Storage Available (in) 5.35 From SFWMD; Basis for Review, Volume IV Available Soil Storage 2.80 (Developed Storage Available) x (Pervious Area)/(12 inches/ft) Site-Wide Soil Storage (S) 3.11 (Available Soil Storage/Site Area) x (12 inches/ft) CN for Sub-Basin 76.27 CN = 1,000 /(S + 10)

Stage Storage Stage - Area (Ac.)

Area 10.50 11.50 12.50 13.40 14.20 14.95 16.00 Sub-Basin 1-DE 11.5 13.4 9.71 0.00 0.00 0.69 1.00 1.27 7.76 9.71 Sub-Basin 1-LE 10.5 14.6 6.03 4.23 4.48 4.49 4.74 4.97 6.03 6.03

4.23 4.48 5.18 5.74 6.24 13.79 15.74

Stage-Volume AF Area 10.50 11.50 12.50 13.40 14.20 14.95 16.00

Sub-Basin 1-DE 11.5 13.4 9.71 0.00 0.13 0.89 3.42 6.80 10.22 14.51 Sub-Basin 1-LE 10.5 14.6 6.03 0.00 4.31 10.19 22.20 36.97 60.48 98.80

0.00 4.44 11.08 25.62 43.77 70.69 113.31

- 4.59

21.03 AF

Volume for Veterans Memorial Blvd Phase 1 per SFWMD ERP No. 11-102981-P, Application No. 210318-5636

Available storage for floodplain compensation for Phase 2 Sub-Basin 1-DE and Sub-Basin 1-LE

Elevation Range

Veterans Memorial Blvd Improvements Phase 2 - East of Railroad

FLOODPLAIN COMBINED CALCULATIONS

Elevation Range Area x Avg Elev.

124.07 23.17

13.61

Elevation Range

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Sub-Basin 4 11.5 16.0 15.15 8.23 Sub-Basin 3 11.5 15.0 13.94 19.51 Sub-Basin 2 10.5 14.3 13.98 0.89 Sub-Basin 1-DE 11.5 14.6 13.76 0.89 Sub-Basin 1-LE 10.5 14.6 12.87 0.23

29.75 424.31 *Does Not Include Building Area Avg Site Grade = Soil Storage

Sub-Basin Area 29.75 Pervious Area 25.40 Average Site Grade (ft) 14.26 Control Elevation (ft) 10 Average Depth to Water Table (ft) 4.26 Soil Compaction Factor (i.e. 25%) 25% Developed Storage Available (in) 8.18 From SFWMD; Basis for Review, Volume IV Available Soil Storage 17.31 (Developed Storage Available) x (Pervious Area)/(12 inches/ft) Site-Wide Soil Storage (S) 6.98 (Available Soil Storage/Site Area) x (12 inches/ft) CN for Sub-Basin 58.88 CN = 1,000 /(S + 10)

Stage Storage Stage - Area (Ac.)

Area 10.50 11.50 11.66 12.50 14.20 14.95 16.00

4.23 10.25 10.58 12.33 29.58 38.16 44.37

Stage-Volume AF Area 10.50 11.50 11.66 12.50 14.20 14.95 16.00

0.00 4.36 6.02 15.65 46.10 71.86 115.32

124.66 Elevation Range Area x Avg Elev.

Veterans Memorial Blvd Improvements Phase 2 - East of Railroad

COMBINED CALCULATIONS

Elevation Range

Elevation Range

14.26

272.01 12.44

2.96 12.24

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Total Phase 1 Sub-Basin 4 8.23 Control Elevation: 10.5 ft NAVD Phase 1 Sub-Basin 3 19.51

Phase 1 Sub-Basin 2 0.89 Allowable Discharge Rate: 0.12 cfs/ac Phase 2 Sub-Basin 1-DE 9.71 Basin Total Area: 44.37 ac

Phase 2 Sub-Basin 1-LE 6.03 Allowable Discharge: 5.32 cfs

TOTAL AREA = 44.37

ON-SITE

Project Area for Water Quality 44.37 Ac

Water Quality:

1. First Inch of Runoff Criteria

1.0in x 1ft/12in x Area (ac) = Volume (ac-ft) 1.0in x 1ft/12in x 44.37 = Volume (ac-ft) 3.70 ac-ft

2. Percent Impervious Criteria

a) Site Area = Project Area - (Lake + Roof)

Site Area = - 4.23 Site Area = ac

b) Imp. Area= Site Area - Pervious Area Imp. Area= - 20.93 Imp. Area= ac

c) Vol. Stor. Req'd= 2.5 in. * (1ft/12in.)*(Imp. Area/Site Area)*(Project Area -Lake) Vol. Stor. Req'd= 2.5 in. * (1ft/12in.) * 0.48 * 40.14 Vol. Stor. Req'd = 4.00 ac-ft

Therefore Calculation # 2 4.00 ac-ft

TOTAL WATER QUALITY VOLUME

On-Site Water Quality Volume Required = 4.00 ac-ft

Sub-total 4.00 ac-ft + 50% Additional Storage 2.00 ac-ft

Total Water Quaility Volume to be Provided 6.00 ac-ft Top of Bank 13.4 14.46 27.59 Dry Detention Bottom 11.5 10.25 4.36

Control Elevation 10.5 4.23 0.00

Water Quality Storage occurs at Elevation 11.66 ft NAVD See Combined Calc's for elevation calculation

Bleeder Calculations:

1/2 in x 1ft/12in x [(Area - Lake) (ac)] = Volume (ac-ft)

Discharge Volume 1.67 ac-ft per 24 hr

Volume (ac-ft) x 1 day/24hours x 1hr/60min x 1min/60sec = Discharge (cfs) Discharge Rate (Q) 0.84 cfs

5.0 inch 0.95 0.14 0.64

Elevation Lake &

Detention Area (ac)

Volume (ac‐ft)

Bleeder Orifice Sizing

Q = 4.8 A H^1/2

Circular A = π*(h/2)2

Assuming h = H (ft)

A (sq‐ft) Q (cfs) =

Veterans Memorial Blvd Improvements Phase 2 - East of Railroad Water Quality Calculations

Controls and a water quality volume of

44.37 40.14

40.14 19.21

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West of Railroad

Basin’s 2 & 3

Project:

Proj. #: 190062.00.01 Task # 0016

Calculated By: NDG Date: 13-May-24 Checked By: LAS Date: 13-May-24

Contents:

- Staff Report Data

- On-Site Land Use Calculations

- Sub-Basin Calculations

- Water Quality Calculations

Veterans Memorial Blvd Improvements - Phase 2 - West of Railroad Water Management Calculations

Veterans Memorial Blvd Improvements - Phase 2

Proj. #: 190062.00.01 Task # 0016

Calculated By: NDG Date: 13-May-24 Checked By: LAS Date: 13-May-24

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

The site is located within the Wiggins Bay Outlet Basin according to the "Allowable Discharge Rates for Projects in the South Florida Water Management Distict."

An additional 50% water quality volume will be provided according to the SFWMD policy for discharge to sensitive receiving waters.

25-year 3-day = 11.50 inches

There will be a berm constructed around the water management system (Drainage Area) , with a minimum crest elevation set at the 100-year 3-day peak. Onsite indigenous preserve and canal maintenance easement areas will be outside of the Drainage Area.

Based on SFWMD Environmental Resource Permit Applications Handbook, Volume II - Using Method 1, SFWMD ERP Application #031219-10 (Permit #11-02353-P) and SFWMD ERP Application #141112-2 (Permit #11-03669-P), the Rainfall Amounts chosen for the design are:

100-year 3-day = 15.00 inches

10-year 1-day = 6.70 inches

The Control Elevation varies between 8.28 and 8.50 ft NAVD based on SFWMD ERP Application #031219-10 (Permit #11- 02353-P) and Application #141112-2 (Permit #11-03669-P) The subject property consists of 44.36 acres.

The Drainage Area will consist of 44.36 acres

Average depth to water level is ± 3.77 ft. Refer to "Water Quality Calculations" and "Lake and Basin Storage Calculations."

Soil compaction factor = 25%.

The following water quality calculations will show storage elevation for the first inch of storm water runoff or 2.5 times the percent impervious, whichever is greater. The bleeder will be designed to allow 1/2" discharge over a 24 hour period.

Veterans Memorial Blvd Improvements - Phase 2

Veterans Memorial Blvd Improvements - Phase 2 - West of Railroad Water Management Calculations

Assumptions

K:\2019\190062.00.01 Veteran's Memorial Extension - Phase 2\016 Master Drainage Infrastructure Plan\Calculations\ERP Calcs\2024-06-10 Water Management Calcs Phase 2 - West of

RR

Water Quantity Discharge Rate:

Discharge Storm Frequency 25 year - 3day Design Rainfall: 11.50 inches

Wiggins Bay Basin (CS-TP3) 3.55 0.13 3.53 11.67 Wiggins Bay Basin (CS-CC4) 2.22 0.13 2.17 11.50

Road Design:

Discharge Storm Frequency 25 year - 3day Design Rainfall: 11.50 inches

Phase 2 Sub-Basin 1 VMB East 11.50 11.70 Phase 2 Sub-Basin 2A US41-VMB 11.67 11.70 Phase 2 Sub-Basin 2B VMB West 11.63 11.70 Phase 2 Sub-Basin 3A Mercedes 12.25 13.00* Phase 2 Sub-Basin 3B Mercedes 12.29 13.00* Phase 2 Sub-Basin 4 Cons. Collier Lake 11.50 11.70 Phase 2 Sub-Basin 5 Triangle Parcel 11.65 12.38** Phase 2 Sub-Basin 5A Triangle Lake 11.65 11.70

Berm Design:

Discharge Storm Frequency 100 year - 3day (w/ Discharge) Design Rainfall: 15.00 inches

Phase 2 Sub-Basin 1 VMB East 12.66 12.80 Phase 2 Sub-Basin 2A US41-VMB 12.67 12.80 Phase 2 Sub-Basin 2B VMB West 12.66 12.80 Phase 2 Sub-Basin 3A Mercedes 13.13 13.30 Phase 2 Sub-Basin 3B Mercedes 13.16 13.30 Phase 2 Sub-Basin 4 Cons. Collier Lake 12.66 12.80 Phase 2 Sub-Basin 5 Triangle Parcel 12.67 12.80** Phase 2 Sub-Basin 5A Triangle Lake 12.67 12.80

Water Quality / Discharge Structures:

Orifice (Circular) 0.25 0.25 8.50 Rectangular Weir 2.34 3.51 11.00 Orifice (Circular) 0.33 0.33 8.50

Rectangular Weir 1.80 0.25 9.78 Horizontal Rectangular

Weir

2.34 3.51 12.80

CS-TP1 Broad Rectangular Weir** 70.00 1.85 10.93 Orifice (Circular)** 0.27 0.27 8.28

Horizontal Rectangular Weir**

2.00 3.00 10.90

Orifice (Circular) 0.42 0.42 8.50 Rectangular Weir 0.60 0.25 8.86

Horizontal Rectangular Weir

3.51 2.34 12.80

Phase 2 Sub-Basin 1 & 4 (VMB East Water Quality Volume)

CS-CC4

Phase 2 Sub-Basin 5 (Triangle Parcel Dry Pretreatment) CS-TP2

Proposed Berm Elevation (ft, NAVD)*

Height (feet) Invert Elev. (ft, NAVD)Width (feet)Str # Type

Veterans Memorial Blvd Improvements - Phase 2 - West of Railroad Staff Report Data

Allow Disch (cfs)

Method of Determination (cfs/ac) Peak Disch (cfs)

Peak Stage Modeled (ft, NAVD)

Basin Peak Stage (ft, NAVD)

CS-MB2

CS-TP3

Basin Peak Stage (ft, NAVD)

Phase 2 Sub-Basin 3A & 3B (Mercedes Dry Pretreatment)

Phase 2 Sub-Basin 2A, 2B, 3A, 3B, 5, & 5A (VMB West Water Quality Volume)

Proposed Min. Road Crown (ft, NAVD)

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Veterans Memorial Blvd Improvements - Phase 2 - West of Railroad Staff Report Data

Water Quality

5.09 5.09

2.13 2.13

Notes:

*Per SFWMD Application #141112-2, Pemit #11-03669-P **Per SFWMD Application #031219-10, Permit #11-02353-P ***Elevation Needed for Floodplain Comp ****Lake Interconnect

Wet/Dry Detention (CS-CC4)

Minimum Vol Prov'd (ac-ft)

Wet/Dry Detention (CS-TP3)

Treatment Method Vol Req'd (ac-ft)

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Site Area (Ac) 9.56 1.05 3.70 5.49 1.78

Commercial Development 9.56 1.05 3.70 5.49 1.78

Building 0.00 0% 0.00 0% 0.00 0% 1.98 36% 0.00 0% Pavement/Sidewalk 4.65 49% 0.74 70% 2.37 64% 2.70 49% 0.98 55% Lake @ Control 0.00 0% 0.00 0% 0.00 0% 0.00 0% 0.00 0% Lake Slope Area 0.00 0.00 0.00 0.00 0.00 Dry Detention Bottom 0.38 0.00 0.08 0.05 0.04

Dry Detention Slope Area 0.89 0.00 0.27 0.26 0.32

Open Space 3.64 0.31 0.98 0.50 0.44 Total Area Less Building 9.56 1.05 3.70 3.51 1.78 Lake Area 0.00 0% 0.00 0% 0.00 0% 0.00 0% 0.00 0% Total Building 0.00 0% 0.00 0% 0.00 0% 1.98 36% 0.00 0% Total Pavement/Sidewalk 4.65 49% 0.74 70% 2.37 64% 2.70 49% 0.98 55% Total Pervious Area3 4.91 51% 0.31 30% 1.33 36% 0.81 15% 0.80 45% Total Sub‐Basin Area (Ac) 9.56 100% 1.05 100% 3.70 100% 5.49 100% 1.78 100%

Site Area (Ac) 7.50 10.99 4.29 44.36

Commercial Development 7.50 10.99 4.29 44.36 Building 0.00 0% 3.36 31% 0.00 0% 5.34 12% Pavement/Sidewalk 0.00 0% 5.63 51% 0.00 0% 17.07 38% Lake @ Control 4.89 65% 0.00 0% 2.79 65% 7.68 17% Lake Slope Area 1.01 0.00 0.78 1.79 Dry Detention Bottom 0.00 0.23 0.00 0.78 Dry Detention Slope Area 0.00 0.37 0.00 2.11 Open Space 1.60 1.40 0.72 9.59 Total Area Less Building 7.50 7.63 4.29 39.02 Lake Area 4.89 65% 0.00 0% 2.79 65% 7.68 17% Total Building 0.00 0% 3.36 31% 0.00 0% 5.34 12% Total Pavement/Sidewalk 0.00 0% 5.63 51% 0.00 0% 17.07 38% Total Pervious Area3 2.61 35% 2.00 18% 1.50 35% 14.27 32% Total Sub‐Basin Area (Ac) 7.50 100% 10.99 100% 4.29 100% 44.36 100%

Notes

1. Mercedes Benz areas based on approved ERP Permit No. 11‐03669‐P, App. No. 141112‐2

2. Triangle Parcel areas based on approved ERP Permit No. 11‐02353‐P, App. No. 031219‐10

3. Total Pervious Area is inclusive of Lake Slope Area, Dry Detention Bottom, and Dry Detention Slope Area

0%

13%

Phase 2 Sub‐Basin 2A US41‐VMB

0%

Phase 2 Sub‐Basin 3B Mercedes1

9% 20%

0% 5%

Drainage Basin Total

Phase 2 Sub‐Basin 3A Mercedes1

6%

7%

Phase 2 Sub‐Basin 2B VMB West

Phase 2 Sub‐Basin 5 Triangle Phase 2 Sub‐Basin 5A Triangle LakePhase 2 Sub‐Basin 4 Cons. Collier

Veterans Memorial Blvd Improvements - Phase 2 - West of Railroad

DRAINAGE BASIN LAND USE

Phase 2 Sub‐Basin 1 VMB East

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Open Space* 11.70 13.40 12.55 3.64 Pavement 11.70 13.40 12.55 4.65 Dry Detention Slope 10.00 12.80 11.40 0.89 Lake Slope 8.50 12.80 10.65 0.00

9.18 Avg Site Grade =

Soil Storage

Sub-Basin Area 9.56 Pervious Area 4.53 Average Site Grade (ft) 12.44 Control Elevation (ft) 8.5 Average Depth to Water Table (ft) 3.94 Soil Compaction Factor (i.e. 25%) 25% Developed Storage Available (in) 8.01 From SFWMD; Basis for Review, Volume IV Available Soil Storage 3.02 (Developed Storage Available) x (Pervious Area)/(12 inches/ft Site-Wide Soil Storage (S) 3.80 (Available Soil Storage/Site Area) x (12 inches/ft) CN for Sub-Basin 72.49 CN = 1,000 /(S + 10)

Stage Storage Stage - Area (Ac.)

Area 8.50 10.00 11.70 12.80 13.40 14.40 Open Space* 11.70 13.40 3.64 0.00 0.00 0.00 2.36 3.64 3.64 Pavement 11.70 13.40 4.65 0.00 0.00 0.00 3.01 4.65 4.65 Dry Detention Slope 10.00 12.80 0.89 0.00 0.00 0.54 0.89 0.89 0.89 Lake Slope 8.50 12.80 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Dry Detention Bottom 10.00 12.80 0.38 0.00 0.38 0.38 0.38 0.38 0.38 Lake 8.50 12.80 0.00 0.00 0.00 0.00 0.00 0.00 0.00

9.56 0.00 0.38 0.92 6.63 9.56 9.56

Stage-Volume (AF) Area 8.50 10.00 11.70 12.80 13.40 14.40

Open Space* 11.70 13.40 3.64 0.00 0.00 0.00 1.30 3.09 6.73 Pavement 11.70 13.40 4.65 0.00 0.00 0.00 1.65 3.95 8.60 Dry Detention Slope 10.00 12.80 0.89 0.00 0.00 0.46 1.25 1.78 2.67 Lake Slope 8.50 12.80 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Dry Detention Bottom 10.00 12.80 0.38 0.00 0.00 0.65 1.06 1.29 1.67 Lake 8.50 12.80 0.00 0.00 0.00 0.00 0.00 0.00 0.00

9.56 0.00 0.00 1.11 5.26 10.12 19.68

Elevation Range

58.36 10.15

114.19 12.44

Elevation Range

0.00

45.68

Veterans Memorial Blvd Improvements - Phase 2 - West of Railroad

PHASE 2 SUB-BASIN 1 (VMB EAST) CALCULATIONS

Elevation Range Area x Avg Elev.

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Open Space* 11.70 12.90 12.30 0.31 Pavement 11.70 12.90 12.30 0.74 Dry Detention Slope 9.50 12.80 11.15 0.00 Lake Slope 8.50 12.80 0.00 0.00

1.05 Avg Site Grade =

Soil Storage

Sub-Basin Area 1.05 Pervious Area 0.31 Average Site Grade (ft) 12.30 ` Control Elevation (ft) 8.5 Average Depth to Water Table (ft) 3.80 Soil Compaction Factor (i.e. 25%) 25% Developed Storage Available (in) 7.63 From SFWMD; Basis for Review, Volume IV Available Soil Storage 0.20 (Developed Storage Available) x (Pervious Area)/(12 inches/ft Site-Wide Soil Storage (S) 2.25 (Available Soil Storage/Site Area) x (12 inches/ft) CN for Sub-Basin 81.62 CN = 1,000 /(S + 10)

Stage Storage Stage - Area (Ac.)

Area 8.50 9.50 11.70 12.80 12.90 13.90 Open Space* 11.70 12.90 0.31 0.00 0.00 0.00 0.28 0.31 0.31 Pavement 11.70 12.90 0.74 0.00 0.00 0.00 0.68 0.74 0.74 Dry Detention Slope 9.50 12.80 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Lake Slope 8.50 12.80 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Dry Detention Bottom 9.50 12.80 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Lake 8.50 12.80 0.00 0.00 0.00 0.00 0.00 0.00 0.00

1.05 0.00 0.00 0.00 0.96 1.05 1.05

Stage-Volume (AF) Area 8.50 9.50 11.70 12.80 12.90 13.90

Open Space* 11.70 12.90 0.31 0.00 0.00 0.00 0.16 0.19 0.50 Pavement 11.70 12.90 0.74 0.00 0.00 0.00 0.37 0.44 1.18 Dry Detention Slope 9.50 12.80 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Lake Slope 8.50 12.80 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Dry Detention Bottom 9.50 12.80 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Lake 8.50 12.80 0.00 0.00 0.00 0.00 0.00 0.00 0.00

1.05 0.00 0.00 0.00 0.53 0.63 1.68

Elevation Range

9.10 0.00 0.00 12.92

12.30

Elevation Range

3.81

Veterans Memorial Blvd Improvements - Phase 2 - West of Railroad

PHASE 2 SUB-BASIN 2A (US41-VMB) CALCULATIONS

Elevation Range Area x Avg Elev.

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Open Space* 11.70 12.90 12.30 0.98 Pavement 11.70 12.90 12.30 2.37 Dry Detention Slope 9.50 12.80 11.15 0.27 Lake Slope 8.50 12.80 0.00 0.00

3.62 Avg Site Grade =

Soil Storage

Sub-Basin Area 3.70 Pervious Area 1.25 Average Site Grade (ft) 12.21 ` Control Elevation (ft) 8.5 Average Depth to Water Table (ft) 3.71 Soil Compaction Factor (i.e. 25%) 25% Developed Storage Available (in) 7.39 From SFWMD; Basis for Review, Volume IV Available Soil Storage 0.77 (Developed Storage Available) x (Pervious Area)/(12 inches/ft Site-Wide Soil Storage (S) 2.50 (Available Soil Storage/Site Area) x (12 inches/ft) CN for Sub-Basin 80.02 CN = 1,000 /(S + 10)

Stage Storage Stage - Area (Ac.)

Area 8.50 9.50 11.70 12.80 12.90 13.90 Open Space* 11.70 12.90 0.98 0.00 0.00 0.00 0.90 0.98 0.98 Pavement 11.70 12.90 2.37 0.00 0.00 0.00 2.17 2.37 2.37 Dry Detention Slope 9.50 12.80 0.27 0.00 0.00 0.18 0.27 0.27 0.27 Lake Slope 8.50 12.80 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Dry Detention Bottom 9.50 12.80 0.08 0.00 0.08 0.08 0.08 0.08 0.08 Lake 8.50 12.80 0.00 0.00 0.00 0.00 0.00 0.00 0.00

3.70 0.00 0.08 0.26 3.42 3.70 3.70

Stage-Volume (AF) Area 8.50 9.50 11.70 12.80 12.90 13.90

Open Space* 11.70 12.90 0.98 0.00 0.00 0.00 0.49 0.59 1.57 Pavement 11.70 12.90 2.37 0.00 0.00 0.00 1.19 1.42 3.79 Dry Detention Slope 9.50 12.80 0.27 0.00 0.00 0.20 0.45 0.47 0.74 Lake Slope 8.50 12.80 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Dry Detention Bottom 9.50 12.80 0.08 0.00 0.00 0.18 0.26 0.27 0.35 Lake 8.50 12.80 0.00 0.00 0.00 0.00 0.00 0.00 0.00

3.70 0.00 0.00 0.37 2.40 2.75 6.45

Elevation Range

29.15

44.22 12.21

Elevation Range

3.01 0.00

12.05

Veterans Memorial Blvd Improvements - Phase 2 - West of Railroad

PHASE 2 SUB-BASIN 2B (VMB WEST) CALCULATIONS

Elevation Range Area x Avg Elev.

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Open Space* 13.00 13.90 13.45 0.50 Pavement 13.00 13.90 13.45 2.70 Dry Detention Slope 9.50 13.00 11.25 0.26 Lake Slope 8.50 13.00 10.75 0.00

3.46 Avg Site Grade =

Soil Storage

Sub-Basin Area 5.49 Pervious Area 0.76 Average Site Grade (ft) 13.28 Control Elevation (ft) 8.5 Average Depth to Water Table (ft) 4.78 Soil Compaction Factor (i.e. 25%) 25% Developed Storage Available (in) 8.18 From SFWMD; Basis for Review, Volume IV Available Soil Storage 0.52 (Developed Storage Available) x (Pervious Area)/(12 inches/ft Site-Wide Soil Storage (S) 1.13 (Available Soil Storage/Site Area) x (12 inches/ft) CN for Sub-Basin 89.83 CN = 1,000 /(S + 10)

Stage Storage Stage - Area (Ac.)

Area 8.50 9.50 12.99 13.00 13.90 14.90 Open Space* 13.00 13.90 0.50 0.00 0.00 0.00 0.00 0.50 0.50 Pavement 13.00 13.90 2.70 0.00 0.00 0.00 0.00 2.70 2.70 Dry Detention Slope 9.50 13.00 0.26 0.00 0.00 0.26 0.26 0.26 0.26 Lake Slope 8.50 13.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Dry Detention Bottom 9.50 13.00 0.05 0.00 0.05 0.05 0.05 0.05 0.05 Lake 8.50 13.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

3.51 0.00 0.05 0.31 0.31 3.51 3.51

Stage-Volume (AF) Area 8.50 9.50 12.99 13.00 13.90 14.90

Open Space* 13.00 13.90 0.50 0.00 0.00 0.00 0.00 0.23 0.73 Pavement 13.00 13.90 2.70 0.00 0.00 0.00 0.00 1.22 3.92 Dry Detention Slope 9.50 13.00 0.26 0.00 0.00 0.45 0.46 0.69 0.95 Lake Slope 8.50 13.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Dry Detention Bottom 9.50 13.00 0.05 0.00 0.00 0.17 0.18 0.22 0.27 Lake 8.50 13.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

3.51 0.00 0.00 0.63 0.63 2.35 5.86

6.73

Veterans Memorial Blvd Improvements - Phase 2 - West of Railroad

PHASE 2 SUB-BASIN 3A (MERCEDES) CALCULATIONS

Elevation Range Area x Avg Elev.

Elevation Range

36.32 2.93 0.00 45.97

13.28

Elevation Range

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Open Space* 13.00 13.90 13.45 0.44 Pavement 13.00 13.90 13.45 0.98 Dry Detention Slope 9.50 13.00 11.25 0.32 Lake Slope 8.50 13.00 10.75 0.00

1.74 Avg Site Grade =

Soil Storage

Sub-Basin Area 1.78 Pervious Area 0.76 Average Site Grade (ft) 13.05 Control Elevation (ft) 8.5 Average Depth to Water Table (ft) 4.55 Soil Compaction Factor (i.e. 25%) 25% Developed Storage Available (in) 8.18 From SFWMD; Basis for Review, Volume IV Available Soil Storage 0.52 (Developed Storage Available) x (Pervious Area)/(12 inches/ft Site-Wide Soil Storage (S) 3.49 (Available Soil Storage/Site Area) x (12 inches/ft) CN for Sub-Basin 74.11 CN = 1,000 /(S + 10)

Stage Storage Stage - Area (Ac.)

Area 8.50 9.50 12.99 13.00 13.90 14.90 Open Space* 13.00 13.90 0.44 0.00 0.00 0.00 0.00 0.44 0.44 Pavement 13.00 13.90 0.98 0.00 0.00 0.00 0.00 0.98 0.98 Dry Detention Slope 9.50 13.00 0.32 0.00 0.00 0.32 0.32 0.32 0.32 Lake Slope 8.50 13.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Dry Detention Bottom 9.50 13.00 0.04 0.00 0.04 0.04 0.04 0.04 0.04 Lake 8.50 13.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

1.78 0.00 0.04 0.36 0.36 1.78 1.78

Stage-Volume (AF) Area 8.50 9.50 12.99 13.00 13.90 14.90

Open Space* 13.00 13.90 0.44 0.00 0.00 0.00 0.00 0.20 0.64 Pavement 13.00 13.90 0.98 0.00 0.00 0.00 0.00 0.44 1.42 Dry Detention Slope 9.50 13.00 0.32 0.00 0.00 0.56 0.56 0.85 1.17 Lake Slope 8.50 13.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Dry Detention Bottom 9.50 13.00 0.04 0.00 0.00 0.14 0.14 0.18 0.22 Lake 8.50 13.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

1.78 0.00 0.00 0.70 0.70 1.66 3.44

Elevation Range

13.18 3.60

22.70 13.05

Elevation Range

0.00

5.92

Veterans Memorial Blvd Improvements - Phase 2 - West of Railroad

PHASE 2 SUB-BASIN 3B (MERCEDES) CALCULATIONS

Elevation Range Area x Avg Elev.

K:\2019\190062.00.01 Veteran's Memorial Extension - Phase 2\016 Master Drainage Infrastructure Plan\Calculations\ERP Calcs\ 2024-06-10 Water Management Calcs Phase 2 - West of jjs 10 of 17

Open Space* 11.70 12.90 12.30 1.60 Pavement 11.70 12.90 12.30 0.00 Dry Detention Slope 9.50 12.80 11.15 0.00 Lake Slope 8.50 12.80 10.65 1.01

2.61 Avg Site Grade =

Soil Storage

Sub-Basin Area 7.50 Pervious Area 2.61 Average Site Grade (ft) 11.66 Control Elevation (ft) 8.5 Average Depth to Water Table (ft) 3.16 Soil Compaction Factor (i.e. 25%) 25% Developed Storage Available (in) 5.55 From SFWMD; Basis for Review, Volume IV Available Soil Storage 1.21 (Developed Storage Available) x (Pervious Area)/(12 inches/ft Site-Wide Soil Storage (S) 1.93 (Available Soil Storage/Site Area) x (12 inches/ft) CN for Sub-Basin 83.82 CN = 1,000 /(S + 10)

Stage Storage Stage - Area (Ac.)

Area 8.50 9.50 11.70 12.80 12.90 13.90 Open Space* 11.70 12.90 1.60 0.00 0.00 0.00 1.47 1.60 1.60 Pavement 11.70 12.90 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Dry Detention Slope 9.50 12.80 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Lake Slope 8.50 12.80 1.01 0.00 0.23 0.75 1.01 1.01 1.01 Dry Detention Bottom 9.50 12.80 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Lake 8.50 8.50 4.89 4.89 4.89 4.89 4.89 4.89 4.89

7.50 4.89 5.12 5.64 7.37 7.50 7.50

Stage-Volume (AF) Area 8.50 9.50 11.70 12.80 12.90 13.90

Open Space* 11.70 12.90 1.60 0.00 0.00 0.00 0.81 0.96 2.56 Pavement 11.70 12.90 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Dry Detention Slope 9.50 12.80 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Lake Slope 8.50 12.80 1.01 0.00 0.12 1.20 2.17 2.27 3.28 Dry Detention Bottom 9.50 12.80 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Lake 8.50 8.50 4.89 0.00 4.89 15.65 21.03 21.52 26.41

7.50 0.00 5.01 16.85 24.01 24.75 32.25

19.68

Veterans Memorial Blvd Improvements - Phase 2 - West of Railroad

PHASE 2 SUB-BASIN 4 (CONS. COLLIER LAKE) CALCULATIONS

Elevation Range Area x Avg Elev.

Elevation Range

0.00 0.00

30.44 11.66

Elevation Range

10.76

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Open Space* 11.70 12.80 12.25 1.40 Pavement 12.29 14.00 13.15 5.63 Dry Detention Slope 9.30 12.80 11.05 0.37 Lake Slope 8.50 12.80 10.65 0.00

7.40 Avg Site Grade =

Soil Storage

Sub-Basin Area 10.99 Pervious Area 1.77 Average Site Grade (ft) 12.87 Control Elevation (ft) 8.5 Average Depth to Water Table (ft) 4.37 Soil Compaction Factor (i.e. 25%) 25% Developed Storage Available (in) 8.18 From SFWMD; Basis for Review, Volume IV Available Soil Storage 1.21 (Developed Storage Available) x (Pervious Area)/(12 inches/ft) Site-Wide Soil Storage (S) 1.32 (Available Soil Storage/Site Area) x (12 inches/ft) CN for Sub-Basin 88.36 CN = 1,000 /(S + 10)

Stage Storage Stage - Area (Ac.)

Area 8.50 9.30 11.70 12.29 12.80 14.00 15.00 Open Space* 11.70 12.80 1.40 0.00 0.00 0.00 0.75 1.40 1.40 1.40 Pavement 12.29 14.00 5.63 0.00 0.00 0.00 0.00 1.68 5.63 5.63 Dry Detention Slope 9.30 12.80 0.37 0.00 0.00 0.25 0.32 0.37 0.37 0.37 Lake Slope 8.50 12.80 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Dry Detention Bottom 9.30 12.80 0.23 0.00 0.23 0.23 0.23 0.23 0.23 0.23 Lake 8.50 12.80 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

7.63 0.00 0.23 0.48 1.30 3.68 7.63 7.63

Stage-Volume (AF) Area 8.50 9.30 11.70 12.29 12.80 14.00 15.00

Open Space* 11.70 12.80 1.40 0.00 0.00 0.00 0.22 0.77 2.45 3.85 Pavement 12.29 14.00 5.63 0.00 0.00 0.00 0.00 0.43 4.81 10.44 Dry Detention Slope 9.30 12.80 0.37 0.00 0.00 0.30 0.47 0.65 1.09 1.46 Lake Slope 8.50 12.80 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Dry Detention Bottom 9.30 12.80 0.23 0.00 0.00 0.55 0.69 0.81 1.08 1.31 Lake 8.50 12.80 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

7.63 0.00 0.00 0.86 1.38 2.65 9.44 17.07

Elevation Range

74.01 4.09

95.24 12.87

Elevation Range

0.00

17.15

Veterans Memorial Blvd Improvements - Phase 2 - West of Railroad

PHASE 2 SUB-BASIN 5 (TRIANGLE PARCEL) CALCULATIONS

Elevation Range Area x Avg Elev.

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Open Space* 11.70 12.80 12.25 0.72 Pavement 11.70 12.90 12.30 0.00 Dry Detention Slope 9.50 12.80 11.15 0.00 Lake Slope 8.50 12.80 10.65 0.78

1.50 Avg Site Grade =

Soil Storage

Sub-Basin Area 4.29 Pervious Area 1.50 Average Site Grade (ft) 11.42 Control Elevation (ft) 8.5 Average Depth to Water Table (ft) 2.92 Soil Compaction Factor (i.e. 25%) 25% Developed Storage Available (in) 4.70 From SFWMD; Basis for Review, Volume IV Available Soil Storage 0.59 (Developed Storage Available) x (Pervious Area)/(12 inches/ft Site-Wide Soil Storage (S) 1.64 (Available Soil Storage/Site Area) x (12…