Tampa Bay Region - Southwest Florida Water Management District

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SOUTHWEST FLORIDA WATER MANAGEMENT DISTRICT
FY2014 COOPERATIVE FUNDING INITIATIVE APPLICATION FORM
Project Name
Magnolia Drive Outfall - Phase II
Project Number N445
Cooperator
City of Clearwater
Department
Contact Person Elliot Shoberg
Address
100 South Myrtle Ave.
City Sate Zip Clearwter, FL 337585520
Phone # 727-562-4748
Email
elliot.shoberg@myclearwater.com
Project Type:
Water Supply X Water Quality X Flood Protection Natural Systems
Strategic Initiatives:
X Water Quality Maintenance and Improvement Water Quality Monitoring
Alternative Water Supply Conservation
Reclaimed Water Regional Water Supply Planning
Emergency Flood Response
X Floodplain Management
Minimum Flows and Level Establishment and Monitoring Minimum Flows and Levels Recovery
Natural Systems Conservation and Restoration Natural Systems Identification and Monitoring
Indicate All Counties to Benefit From Project:
Charlotte Citrus Desoto Hardee Hernando Highlands Hillsborough Lake
Levy Manatee Marion Pasco X Pinellas Sarasota Sumter Polk
Project Description:
The goal of this project is implementation of the Best Management Practices (BMPs) element of the District's Watershed
Management Program (WMP) in the Coastal Basin 1 Watershed, Magnolia Drive Improvement Area. This urban watershed covers
an area of approximately 45 acres and is located in the City of Clearwater.
There currently is no water quality treatment for the stormwater runoff generated in this area, which is discharged into the St.
Joseph Sound of Clearwater Harbor through the Magnolia Drive Outfall. Significant quantities of vegetative matter, debris, and
sediments deposited on South Fort Harrison Avenue, Druid Road, Jasmine Way, and Magnolia Drive are carried by stormwater and
discharged through this outfall. In addition, it has been determined that the aging stormwater collection infrastructure is inadequate
to convey peak rates of runoff from even a mean annual design storm event.
This project will replace the stormwater inlets, replace aging and undersized pipes, and install 1 to 3 nutrient separating baffle
boxes to collect leaves, debris, and sediments so the materials can be hauled off site for disposal. The proposed second generation
baffle boxes include chambers to trap sediments, a filtration screen to trap organic matter, and a skimmer and boom to collect and
absorb hydrocarbons. It treats the entire flow of stormwater entering the box and includes turbulence deflectors to prevent resuspension
of captured sediments. The Florida Department of Environmental Protection (FDEP) has determined that the average
efficiency of pollution reduction by the baffle box BMP is 44% for non-dissolved solids removal, 10% for nitrogen removal, and 9%
for phosphorus removal.
The District has previously approved cooperative funding for this project in the amount of $1,100,000. That cost was based on
rehabilitation, rather than replacement, of a majority of existing stormwater pipes, and installation of a single baffle box.
Subsequently, the City performed a hydrologic and hydraulic modeling study of the existing stormwater collection system and
determined that the existing pipes are undersized to convey the stormwater runoff generated in this drainage area. The study
included an analysis of improvement alternatives to upgrade the stormwater infrastructure to modern flood protection standards.
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