CATEGORY I – STORMWATER DRAINAGE:
The development of the Stormwater Drainage component of the Capital Improvement Program (CIP) is based on the goals and objectives set forth in the Comprehensive Plan and the specific recommendations or action strategies set forth in the Master Drainage Plan (2000).
Comprehensive Plan Goal: “TO PROTECT THE HEALTH AND SAFETY OF THE PUBLIC BY ENSURING THAT STORMWATER MANAGEMENT FACILITIES ARE PROPERLY MAINTAINED, ENVIRONMENTALLY SOUND, COST EFFECTIVE, AND MEET THE COMMUNITY’S PRESENT AND FUTURE DEMANDS.”
Comprehensive Plan Information – The City’s Comprehensive Plan is divided into two sections: Part 1 – Goals, Objectives and Policies; and Part 2 – Data and Analysis. Part 1 identifies the goal of the Stormwater Drainage Sub-Element as listed above. The Comprehensive Plan Objectives from Part 1 are:
· The City of Marco Island will operate and maintain a stormwater management system that will meet or exceed adopted Level of Service (LOS) design standards over the next five years
· To limit public expenditures for stormwater facilities that would have the effect of directly subsidizing private development
· Surface water in canals will meet the criteria cited in Chapter 62-403.530, F.A.C. for Class II and Class III waters where applicable
· The City will implement a proactive maintenance program to ensure that all current and future stormwater management facilities operate at design capacity
Part 2 of the Comprehensive Plan, which addresses Stormwater Drainage, is based on information and recommendations contained in the City’s Master Drainage Plan. The City’s Plan consultant reviewed original Deltona design plans, and subjected field-verified conditions to a simulated hydraulic model. The resultant engineering data and findings indicated that the existing surface and sub-surface drainage infrastructure generally has the capacity to convey and discharge runoff occurring from the ten-year (frequency) one-hour (duration) storm event. The Plan emphasizes that some planned outfalls were never constructed, and also states that extensive reconstruction/replacement work is necessary for the stormwater drainage system to function at design capacity.
Master Drainage Plan Recommendations - Drainage improvement needs identified in the Master Drainage Plan fall into seven categories: 1) major intersections; 2) additional outfalls; 3) swale regrading; 4) elimination of swale intersections; 5) replacement of throat structures; 6) sediment removal; and 7) relining/reconstructing storm sewer pipes. The Master Drainage Plan estimated a total construction cost of $28,000,000 - $32,000,000, which is planned for an implementation period of approximately fifteen years.
In recognition that drainage deficiencies exist throughout the City requiring diverse corrective actions, this CIP and prior CIP’s provided for a multifaceted approach of funding to support various improvement actions. While significant progress has been made with critical drainage failures addressed in a timely fashion, remaining drainage systems requiring improvements will be perpetuated due to limited capital funds.
Consistency With Adopted Schedule of Capital Improvements – The stormwater drainage expenditures contained in this proposed Five-Year CIP through FY10 promote financial consistency with the adopted Comprehensive Plan.
The Five Year CIP for fiscal years 2006-2010 allocates $3,065,000 for storm drainage.
Project # 1: Drainage Improvements
Project Goal: “To continue with a repair/replacement program for deficient storm sewer outfalls; right-of-way swale drainage; cul-de-sac outfalls; and North Bald Eagle drainage as recommended in the Master Drainage Plan.”
Project Objectives:
1. To annually repair or replace existing storm sewers to maintain or increase existing storm drainage system capacity.
2. To continue with a long-term repair/replacement program for collapsed or structurally failed storm sewers.
3. To perform swale re-grading activities in a prioritized sequence to address developed areas that receive the most valid public complaints of nuisance ponding that affects multiple properties (cul-de-sac outfalls; North Bald Eagle Drive).
4. To perform swale re-grading activities upstream and/or downstream of new single-family home construction to correct inadequate flow conditions.
Project’s Relationship to Comprehensive Plan:
· “The City of Marco Island will operate and maintain a stormwater management system that will meet or exceed adopted Level of Service (LOS) design standards over the next five years.” (Section IV(c), Objective 1.1)
· “The City will implement a proactive maintenance program to ensure that all current and future stormwater management facilities operate at design capacity.” (Section IV(c), Objective 1.4)
Project’s Relationship to Master Drainage Plan Recommendations:
· The Master Drainage Plan identified 31 miles of existing storm sewer pipes and outfalls (15 inch to 48-inch diameter) that in the long-term would require various types of repair and replacement throughout the fourteen (14) drainage areas.
· The Master Drainage Plan identifies a need to install 171 additional storm sewer outfalls to achieve adopted LOS standards.
Success Measurement: Repair/replace approximately five (5) existing outfalls in FY07 and the re-grading of 2,000 linear feet of swales along public rights-of-way in FY07.
Project Narrative: The repair or replacement of existing storm sewers is an on-going program necessary to preserve and maintain existing storm drainage capacity. In some instances the repair and/or replacement of existing storm sewers (including outfall pipes and culverts) is more important than adding a new or supplemental outfall since resulting adverse impacts from collapsed or structurally failed storm sewers in residential areas are measurable as negative impacts on public safety and welfare.
Pipe failures are generally not known or monitored in advance. Information is received by notification from affected property owners. Remedial work typically involves partial or full replacement of failed sewer segments with new pipe, or relining existing pipe interiors with high-density polyethylene storm sewer sleeves to achieve equivalent design flows and structural carrying capacity. New pipe materials and construction repair technologies will be evaluated to improve benefit / cost parameters and to minimize real property disruptions during construction.
Annual re-grading of roadside drainage swales is required to minimize nuisance ponding and to maintain adequate stormwater drainage along local streets to achieve efficient discharges to receiving water bodies. A typical swale segment exhibits flow restrictions due to sedimentation and improper flow line elevations. Occasionally, driveways need to be reconstructed and associated culverts replaced to achieve positive drainage.
The Master Drainage Plan geographically divides the City into 14 drainage regions or basins (i.e., San Marco-Sunset Region). Within each drainage basin, various types of maintenance and capital improvements are designated. This project primarily accounts for new or additional storm sewers and outfall pipes that are required to eliminate or aid in reducing inundation of streets and private properties along public drainage easements. Citywide drainage improvements include replacement of primary and secondary storm sewer systems along roadways and downstream discharge points due to undersized pipes or a lack of conveyance to final outfalls. Moreover, land development activities in the City over the past two decades have increased runoff rates. Supplemental storm sewers and outfalls that result
in additional flow capacity are necessary to maintain an adequate LOS between road rights-of-way and adjacent waterways.
North Bald Eagle Drive is in need of major drainage improvements. Strip mercantile businesses along this corridor of Bald Eagle are at an elevation below the roadway. Parking lots become flooded from roadway runoff. This area, on the most southerly portion, begins at the Riverside Club property line, runs north to the Sunrise Bay Resort, and encompasses adjacent property across the street, at Marco Vista Condos. Improvements made with this project would make this area safe for pedestrians and motorists.
Five-Year Funding Recommendation:
FY07 |
FY08 |
FY09 |
FY10 |
FY11 |
Total |
575,000 |
685,000 |
575,000 |
400,000 |
400,000 |
2,635,000 |
Funding: $2,635,000 GF
Project #2: Water Quality Improvements
Project Goal: “To continue with an on-going program to reconstruct throat inlets to maximize capacity and enhance safety and aesthetics at critical locations throughout the City.”
Project Objectives:
1. To continue with a drainage improvement program to reconstruct throat inlets at various locations throughout the City within annual approved CIP budgets for the period FY07-FY11.
2. Install water quality inserts (Suntree type) into storm inlets at various locations within annual approved CIP budget.
Project’s Relationship to Comprehensive Plan:
· “The City of Marco Island will operate and maintain a stormwater management system that will meet or exceed adopted Level of Service (LOS) design standards over the next five years.” (Section IV(c), Objective 1.1)
· “The City will implement a proactive maintenance program to ensure that all current and future stormwater management facilities operate at design capacity.” (Section IV(c), Objective 1.4)
Project’s Relationship to Master Drainage Plan Recommendations:
· The Master Drainage Plan recommends conversion of throat inlet structures to FDOT ditch bottom inlets.
· Meet regulatory requirements for water quality.
Success Measurement: Reconstruct approximately 25 drainage inlets each year in which funds are allocated.
Project Narrative: Reconstruction of existing throat type drainage inlets is recommended for both safety and maintenance reasons. Existing throat inlets are generally large and protrude one (1) to three (3) feet above the swale bottom, posing a potential hazard to pedestrians and vehicles. The annual allocation of $50,000 will support replacement of approximately 25 throat inlets utilizing FDOT ditch bottom grate inlets. There are an estimated 738 throat inlets in the City. Remaining inlet replacement work is scheduled over a 16-year period based on an allocation of $50,000 per year.
The City has approximately 1,000 stormwater inlets. The South Florida Water Management District (SFWMD) requires that each inlet be retrofitted with a device to capture floatables, such as hydrocarbons, grease, oil, and debris before it enters our waterways. The SFWMD provided the City with a $140,000 grant in FY06 to install these inlet skimmer boxes. Grant applications have been submitted for FY07.
Five-Year Funding Recommendation:
FY07 |
FY08 |
FY09 |
FY10 |
FY11 |
Total |
200,000 |
200,000 |
200,000 |
200,000 |
200,000 |
1,000,000 |
Funding: $300,000 Grants
$700,000 GF
Project #3: Elkcam Circle Outfall
Project Goal: “To repair and replace the Elkcam Circle outfall.”
Project Objectives:
1. To complete repair and replacement of the storm sewer facility to avoid further pipe collapses which would result in property damages and unsafe and hazardous site conditions.
Project’s Relationship to Comprehensive Plan:
· “The City of Marco Island will operate and maintain a stormwater management system that will meet or exceed adopted Level of Service (LOS) design standards over the next five years.” (Section IV(c), Objective 1.1)
· “Surface water in canals will meet the criteria cited in Chapter 62-403.530, F.A.C., for Class II and Class III waters where applicable.” (Section IV(c), Objective 1.3)
Project’s Relationship to Master Drainage Plan Recommendations:
· A recent inspection by staff reveals a failing storm sewer that requires replacement and rerouting.
Success Measurement: Construction is scheduled to begin in FY07.
Project Narrative: The existing outfall has failed between Elkcam Circle and the Rose Court waterway. This outfall serves Elkcam Circle as well as the new utility property to be exchanged with the County.
Five-Year Funding Recommendation:
FY07 |
FY08 |
FY09 |
FY10 |
FY11 |
Total |
150,000 |
0 |
0 |
0 |
0 |
150,000 |
Funding: $150,000 GF
Project #4: Florentine Gardens Outfall
Project Goal: “To repair and replace the Florentine Gardens storm sewer outfall facility.”
Project Objectives:
1. To complete repair and replacement of the storm sewer facility to avoid further pipe collapses which would result in property damages and unsafe and hazardous site conditions. The storm sewer runs under the condominium building.
2. To relocate the storm drain around the building and relocate outfall penetration into the easement between Florentine Gardens and Harbor Boat Club to the west. The existing storm sewer will be abandoned in place and filled with grout.
Project’s Relationship to Comprehensive Plan:
· “The City of Marco Island will operate and maintain a stormwater management system that will meet or exceed adopted Level of Service (LOS) design standards over the next five years.” (Section IV(c), Objective 1.1)
· “Surface water in canals will meet the criteria cited in Chapter 62-403.530, F.A.C., for Class II and Class III waters where applicable.” (Section IV(c), Objective 1.3)
Project’s Relationship to Master Drainage Plan Recommendations:
· A recent inspection by staff reveals a failing storm sewer that requires replacement and rerouting.
Success Measurement: Construction is scheduled to begin in FY09.
Project Narrative: The outfall runs directly under this condominium. This pipe has had a few repairs made to it outside the building. The pipe is approximately 35 years old, and the major focus of this project would be abandoning the pipe in place, filling it with grout and relocating the outfall penetration into the easement between Florentine Gardens and The Harbor Boat Club to the West.
Five-Year Funding Recommendation:
FY07 |
FY08 |
FY09 |
FY10 |
FY11 |
Total |
0 |
0 |
200,000 |
0 |
0 |
200,000 |
Funding: $200,000 GF
Project #5: Swallow Avenue Drainage
Project Goal: “To continue with an on-going drainage improvement program to provide stormwater flow capacity required at critical locations throughout the City.”
Project Objectives:
1. To continue with a citywide drainage improvement program to maintain and increase stormwater flow capacity in existing storm sewers and outfalls at critical locations throughout the City that have structural deficiencies.
2. To continue with a citywide drainage improvement program to provide design flow capacity at critical locations throughout the City that are devoid of storm sewers and outfalls.
Project’s Relationship to Comprehensive Plan:
· “The City of Marco Island will operate and maintain a stormwater management system that will meet or exceed adopted Level of Service (LOS) design standards over the next five years.” (Section IV(c), Objective 1.1)
· “The City will implement a proactive maintenance program to ensure that all current and future stormwater management facilities operate at design capacity.” (Section IV(c), Objective 1.4)
Project’s Relationship to Master Drainage Plan Recommendations:
· The Master Drainage Plan identifies a need to maintain storm sewers to achieve adopted LOS standards.
Project Narrative: This system consists of two 36” diameter corrugated aluminum pipes. The joints are failing due to dissimilar metals and the method of construction. This storm sewer will be directed to the new Florentine Gardens Outfall, described in Item 4. This project will be undertaken in FY08.
Five-Year Funding Recommendation:
FY07 |
FY08 |
FY09 |
FY10 |
FY11 |
Total |
0 |
225,000 |
0 |
0 |
0 |
225,000 |
Funding: $225,000 GF
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