FLORIDA STORMWATER ASSOCIATION

Transcription

1 FLORIDA STORMWATER ASSOCIATION June 16, 2016 Heather Maggio, City of Tampa Tonya Simmons, Greenman-Pedersen, Inc. (GPI)

2 History of Lowry Park Zoo Importance of the Water Resources Master Plan Objectives of the Plan Existing Conditions Considerations in Evaluating Options Recommended Projects Next Steps

3 City Commissioner, Dr. Sumter L. Lowry, persuaded City to purchase downtown property for a public park, which is now part of the University of Tampa Dr. Lowry donated land for a park in Historic Seminole Heights. City named the new park Lowry Park 1930 s - the downtown park became a small municipal zoo with Florida native species

4 Mid-50s City moved Tampa Zoo to Lowry Park property, naming it Lowry Park Zoo 1982 community leaders created the Lowry Park Zoo Association to take over management of the Zoo as a public-private partnership Zoo shut down in late 80s for a $20M reconstruction Reopened in 1998 as a modern 24-acre facility

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6 1998 EPA adopted a totalnitrogen TMDL for Tampa Bay The TMDL is split into four segments of Tampa Bay Tampa Bay Nitrogen Management Consortium, a public-private partnership of stakeholders, developed a Reasonable Assurance Plan (RAP) in 2009 to address nitrogen loadings through nutrient-abatement projects in each watershed.

7 Zoo is located in the Hillsborough Bay Watershed Total allocation for the watershed is 486 tons/yr Through the RAP process, Zoo was assigned a total nitrogen allocation of 1.5 tons/yr total annual 1.0 tons/yr five-year rolling average The FDEP put the allocation in the Zoo s 2012 Industrial Wastewater NPDES Permit

8 Hillsborough River is an impaired waterbody (WBID 1443E) and has a fecal coliform TMDL adopted by the FDEP in 2004: 400 CFU/100 ml monthly average 800 CFU/100 ml maximum day

9 Improve water-use efficiency within the Zoo Improve quality of water discharged by the Zoo Intention: evaluate viable waterquality and reuse options that, when implemented, will reduce pollutants discharged by Zoo to Hamilton Creek (tributary discharging to Hillsborough River)

10 Information gaps with respect to existing infrastructure Impossible to develop a nearaccurate water balance without extensive sub-metering, which was outside of the project budget Much of the Zoo cannot be accessed except for a couple of hours in the morning

11 Self-supplied wells 5 MG/mo from 3 metered wells Unk. volume from 2 unmetered wells Used for irrigation, filter backwashing, and filling most exhibit pools Potable Water purchased from City 1.5 MG/mo Used to meet all needs not met with well water, including toilet flushing, filling a few exhibit pools, and washing down exhibits and night houses

12 Flows to City s sanitary sewer All domestic wastewater Pool drops from a few exhibits Majority of backwash water from filter systems throughout the Zoo Zoo s Onsite Industrial Wastewater Treatment System City of Tampa s AWTP All stormwater in oldest part of Zoo Exhibit pool water from dropping (draining) and cleaning exhibit pools All other water entering a storm inlets Zoo s Industrial WWTP

13 3 SW basins Africa and Wallaroo drain to SW ponds Old Zoo drains to Lake Sharon, is treated as industrial WW, then discharged to Hamilton Creek

14 Fecalcontaminated water from exhibits = Dirty SW (in red) Noncontaminated SW and rainwater = Clean SW (in orange)

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16 Existing Layout of Lake Sharon Pumping, Treatment, and Discharge

17 Emergency Overflow over Weir Treated Effluent Emergency overflow is untreated Lake Sharon SW The outfall goes to Hamilton Creek Hamilton Creek goes to Hillsborough River

18 On average, Zoo discharges 20% of its annual nitrogen loading allocation Fecal loading, on average had been 30% of its monthly-average allowance and 43% of its maximum-daily allowance Zoo had exceeded maximum-day fecal limit three times since 2012 because: UV failed twice (now repaired) Untreated water from Lake Sharon topped over the weir Greatest concerns for impacting WQ: Potential of untreated Lake Sharon water topping over weir Failure of the UV system to disinfect Lake Sharon water prior to discharge

19 Separation of clean and dirty water would be highly disruptive to animals because of the layout of Old Zoo UV system capable of meeting fecal coliform limits as long as system was properly working and levels entering the UV system were within the design range Lake Sharon pumping and filtration systems were dated and inefficient Pumping, filtering, and disinfection systems lacked back-up power and instrumentation and controls (I&C) Treatment system and I&C improvements could provide system reliability and ondemand power, pumping, and treatment redundancy Reuse of treated Lake Sharon effluent provides an opportunity to offset water uses from wells and some uses of purchased potable water

20 Relocate Lake Sharon intake and pumping Install improved filtration and disinfection system with I&C Store treated water in underground vault

21 Targeted diversion and storage of clean SW from Zoo Entrance Developed as an add-on option to Lake Sharon Reuse

22 Feasible options also included rain gardens in all Zoo basins Provide great public-education benefit USF to test conventional vs. engineered rain gardens

23 Secure funding to implement reuse and rain-garden projects Sub-meter exhibit-pool washdowns to better quantify appropriate storage volume, pumping requirements, and reuse piping sizes Identify acceptable water quality for each potential use each exhibit has unique waterchemistry requirements

24 Cooperative Funding Initiative