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HomeMy Public PortalAboutCC Workshop 072816.pptxCarrying Capacity Study Update To City Council July 28, 2015 City of Tybee Island 1 Scope of Work Technical Advisory Group Community Resources Inventory & Assessment Analysis of Community Resources Limitations Recommendations & Implementation Plan Coordination with Comprehensive Plan Process Scheduled to be completed in October 2016 2 Public Involvement Technical Advisory Group – 3 Meetings Comprehensive Plan Joint Meetings – 4 Meetings Infrastructure/Staff Meeting – 1 Meeting Future Meetings: Technical Advisory Group Planning & Zoning Commission City Council 3 Human Application of Carrying Capacity I = P x A x T I = Environmental Impact P = Population A = Affluence T = Technology Human carrying capacity is not strictly related to population size, but to many levels of consumption, which are in turn impacted by technology and the economy. Local governments have the opportunity to opportunity to impact these variables through regulatory and policy choices related to land use, infrastructure improvements, growth management, and the local economy. Wave Ecology and Highway 80 Challenge Study 2011 4 Carrying Capacity Community Resources Inventory and Data Assessment Population Water Withdrawal Wastewater Discharge Traffic Counts & Parking Short Term Rental Units Zoning Solid Waste Flooding/Sea Level Rise 5 Population 6 Tybee Population - Resident 7 Historical Population 8 Housing Units – Census 9 Short Term Rental units * Tybee Tourism Study estimates 4.3 people per unit, which equals a maximum short term rental population of 7,473 10 Short Term Rental Population 11 Second Home Population 12 Traffic Counts 13 Traffic Counts & Daytime Population 14 Population 1Does not account for Second Home Population 2Short Term Rental + Second Home Population 15 Water Withdrawal 16 Water Withdrawal 17 Water Withdrawal – Future Permit Limits 18 Per Capita Water Usage 19 Future Water Withdrawal Demand *Per Capita Water Demand 115 GPD 20 Wastewater Discharge 21 Wastewater discharge 22 Wastewater Discharge 23 Parking Statistics Public Parking Spaces (Delineated) = 2,091 Private Parking Spaces (Permitted) = 234 Additional non-delineated ROW & parking at private homes provides additional spaces Parking Areas & Capacity on Summer Weekends 24 25 26 Solid Waste – Residential Trends 27 Solid Waste – non-Residential Trends 28 Nuisance flooding 2016, January. Evans, Jason et all. Tybee Island Sea-Level Rise Adaptation Plan Draft for Official Review and Comment, National Sea Grant College Program 29 Sea Level Rise/Flooding 30 Flooding of Highway 80 31 Vulnerabilities Identified in the Sea Level Rise Study • Failures of the local stormwater management system • Flooding of roads, particularly US Highway 80 • Increased beach erosion • Saltwater intrusion • Higher and stronger storm surges 32 Zoning Analysis Preliminary Results Current conditions 33 Zoning Analysis Preliminary Results Future Build Out 34 R2 Zoning - Population Growth implications 35 Future Water Withdrawal Demand *Per Capita Water Demand 115 GPD 36 Understanding of Carrying Capacity goals Diverse and stable year-round population with a high quality of life Sustainable tourism-based economy that also serves year-round population and business owners in the off-season Balance between the needs of the tourism industry and year round residents Protection of Tybee Island’s environmental, historic and cultural resources Safe multi-modal access to, from and within Tybee Island for residents and visitors Adapting to a changing climate Political and public support for implementation of the plan recommendations 37 Identification Of Issues/impacts - Water Issues Permit limitation Peak usage associated with tourist population Cost of needed capital improvements Potential Strategies Cretaceous Well & Treatment Plant Education for tourist, kids, development community Gray water usage Rate study Incentives for conservation 38 Identification Of Issues/impacts - Wastewater Issues Peak wastewater discharge issues associated with tourists Compounding effects of I&I. Capacity of WWTP infrastructure Potential Strategies Upgrade WWTP Potential water quality issues from discharge Lack of space for WWTP expansion Permitting and environmental impacts of upgrading discharge pipe 39 Identification Of Issues/impacts - Stormwater Issues Nuisance flooding associated with king high tide and rain events. Sea level rise is exacerbating flooding Additional development may also exacerbate flooding Cost of infrastructure upgrades Water quality issues that result from flooding Potential Strategies Sea Level Rise Study recommended improvements Limiting impervious surfaces 40 Identification Of Issues/impacts – Traffic/Parking Issues Peak traffic flow issues related to day-trippers and events Flooding of Hwy 80 and other roads on-island Traffic related to accidents on Hwy 80 Parking availability and available land to accommodate it Illegal parking and congestion in residential areas Lack of alternative modes of transportation No public harbor to allow for ferry service to Savannah Potential Strategies Cost/benefit analysis of parking lot in C1 Remote parking with transportation Multi-modal opportunities for transportation to and within Tybee Island Notifying people about traffic congestion and parking issues 41 Identification Of Issues/impacts – Short Term Rentals Issues Peak water & wastewater usage on the island is driven by short term rentals Short-term rentals are a component of all above elements, but are also important to the economy of the island Conversion from short-term rental to year round also has impacts that need to be considered Strategies 42 Identification Of Issues/impacts – City Funding Issues Need for reserves in the general fund for disaster preparedness and infrastructure improvements Capital costs for known projects Strategies Rate study for water & wastewater infrastructure improvements City position for coordination with tourism industry Stormwater utility feasibility study 43 Identification Of Issues/impacts - Zoning Issues R-2 Zoning build out R-2 zoning area of Tybee is already flooding at King tides. Strategies Revise R2 cost to decrease subdivision Limit areas zoned R2 Identify areas appropriate for growth (Commercial districts) and steer growth there, i.e. TDR. Spread development out over a long period of time through permitting limitations. 44 Identification Of Issues/impacts - Litter Issues Litter on beach Solid waste disposal trends are still increasing not decreasing as was expected with the advent of recycling Strategies Reduction of waste generation on island Alternatives for solid waste disposal in landfills off island Waste reduction education & litter education Enforcement of Litter ordinance Incentives/programs to encourage better compliance on the beach 45 Next Steps Finalize & Prioritize Strategies to Address Issues Complete Carrying Capacity Report Final Presentation to Council in September Presentation to CRD at Brown Bag luncheon 46