TYBEE ISLAND Wave Ecology & The Highway 80 Challenge Opening the Door on Data October 25, 2010 Tuesday, October 26, 2010 1
“As concerned citizens of The City of Tybee Island, we will be conscientious stewards of our unique historic and cultural heritage, environmental resources, and diverse economic community. We will also ensure that our growth does not exceed the Island’s carrying capacity. ” - “Vision for the Future” City of Tybee Island Master Plan Tuesday, October 26, 2010 2
CARRYING CAPACITY The Human Application I = P x A x T I = Environmental Impact P = Population (Size of Human Population) A = Affluence (Level of Consumption by the Population) T = Technology (Processes to Obtain Resources for Goods & Wastes) Tuesday, October 26, 2010 3
TYBEE’S CAPACITY... HOW CAN WE KNOW? Tuesday, October 26, 2010 4
CARRYING P , A, & T Factors CAPACITY I=PAT Mobility Connectivity Residential & Commercial Energy Sources Medical Services Emergency Response Economic Engines Consumer Goods Tuesday, October 26, 2010 5
CARRYING CAPACITY P-FACTORS WHAT WE KNOW... ANNUAL POPULATION = 3,800 PEAK TOURISM POPULATION = 10,000 July 3, 2010 16,173 vehicles x 2 = 32,346 Tuesday, October 26, 2010 6
CARRYING CAPACITY A-FACTORS Tybee citizens must rely on external sources for commodities from a global market Daily Services Available: Food Gas Medical/Dental Facilities Solid Waste? Electricity Supply? Construction Supplies? Tuesday, October 26, 2010 7
CARRYING CAPACITY A-FACTORS Tybee citizens must rely on external sources (i.e. one connection point at Highway 80) for importing commodities Daily Services Such As... Food Gas/Fuel Medical/Dental Facilities Solid Waste Disposal Electricity Construction/Building Supplies and Many Others Tuesday, October 26, 2010 8
CARRYING CAPACITY A-FACTORS Business as Usual...What is the revenue generator for Tybee? 3 NAICS Code Sectors with 20+ employees Retail Trade = $5,848,000 annually / $786,000 payroll / 59 employees Real Estate, Rental = $3,457,000 annually / $501,000 payroll / 23 employees Accommodation & Food Service = $16,540,000 annually / $4,791,000 / 322 employees *(Source: US Census Bureau 2002 Economic Census) Tybee Island per capita income in 2000 = $32,406 Compared to $21,587 Nationally *(Source: US Census Bureau 2000 Census) Tuesday, October 26, 2010 9
CARRYING CAPACITY T-FACTORS Water & Sewerage = 10,000 persons and NO more... EPD has restricted the increase of water withdrawal permits *Based on Current Permits, EPA Estimations & “Water and Wastewater Treatment Plant Operations” by Frank Spellman 2009 Floridan Aquifer Tybee Island WPCP EPD Drinking Water EPD Permit # GA0020061 Permit # 025-0027 Average limit/month Average limit/year 1.0 MGD 0.960 MGD Average limit/month 1.6 MGD Tuesday, October 26, 2010 10
CARRYING CAPACITY T-FACTORS Existing Housing = 2,859 Units People = 5,918 (based on current household size) Includes owner occupied and second/rental homes Avg. Household Size (2000 Census) = 2.07 Current Residential Population = 3,716 *Based on 2000 Census Data (Includes both rental and owner occupied housing) Tuesday, October 26, 2010 11
CARRYING CAPACITY T-FACTORS Tuesday, October 26, 2010 12
NARSAL: GA Impervious Cover 1991 NARSAL: GA Impervious Cover 2001 NARSAL: GA Impervious Cover 2008 Tuesday, October 26, 2010 13
NARSAL: GA Land Use Trends 1974 NARSAL: GA Land Use Trends 2001 NARSAL: GA Land Use Trends 2008 Tuesday, October 26, 2010 14
CARRYING CAPACITY Hwy 80 Capacity = 12,000v/day * *Based on Highway Capacity Manual v.2000 & “Capacity & Quality of Services of T-FACTORS Two-lane Highways by the Midwest Research Institute at UC-Berkley Tybee Island Weekly Tra ! c Counts Jan - July 2010 Days Breeching Capacity b/w Jan 2010 & Jul 2010 = 23 18,000 Aprox. 11% 16,000 Fri, Sat or Sun Numbers given for estimation purposes. Exact 14,000 highway capacity would need further calculation and Sun Numbers of Automobiles 12,000 traffic count data collected from two lane portion of Mon roadway. Traffic Count data presented represents Tues 10,000 the four lane capacity area where two lane capacity Wed of the Lazaretto Creek bridge turns into four lane. Thurs 8,000 Since few ingress and egress points are located Fri between the two lane to four lane conversion the Sat 6,000 data may still be utilizes for estimation purposes. 4,000 Days Breeching Capacity during 2,000 July Jan 2010 Labor Day Weekend 2010 = 1 2010 0 0 5 10 15 20 25 30 35 No hourly rates exceeded capacity Weeks of the Year However highest hourly V/C ratio was 0.55 (1.0 indicates maximum roadway capacity) (peak hr volume / capacity = v/c ratio) Tuesday, October 26, 2010 15
CARRYING Hwy 80 Capacity = Flooding * CAPACITY *Based on NOAA Tidal Station #8670870 at Fort Pulaski & Chatham County Shallow Coastal Flooding Model at High Tide of 9.2 ft MSLW T-FACTORS Tuesday, October 26, 2010 16
CARRYING Hwy 80 Capacity = Flooding * CAPACITY *Based on NOAA Tidal Station #8670870 at Fort Pulaski & Chatham County Shallow Coastal Flooding Model T-FACTORS 27 Days Above 9.0 ft Sept 24, 2009 through October24, 2010 11 Days Above 9.2ft Sept 24, 2009 through October24, 2010 8 Months Above 9.2ft Tuesday, October 26, 2010 17
CARRYING CAPACITY T-FACTORS Solid Waste: • Waste Pro Landfilled Offsite • Recycling Shipped and Processed Offsite • No Composting of Organic Materials • No Material Reuse Center (including mulch, compost) Electricity Supply: • Georgia Power / International Paper Savannah Mill • Coal Supplied from Scott’s Branch Mountain, Kentucky Tuesday, October 26, 2010 18
CARRYING CAPACITY Conclusion: • Carrying Capacity relative to many variables • Exceeded by Urban Ecological standings • Opportunity to support population beyond carrying capacity depends upon: • Implementing new technologies • Providing multiple modes of connectivity or utilization of resources within the area • Inter-governmental / Inter-agency coordination Tuesday, October 26, 2010 19
INTER-GOV. / INTER- AGENCY COORDINATION Working Together for a Central Purpose Tuesday, October 26, 2010 20
Issue: One Exit (Multiple Jurisdictions) 911 Dispatch Zone not linked to jurisdictions Wave Ecology: Route 80 & Tybee Island n d L e g e C E M A _ H u r r i c a n e _ D e b r i s _ S t o r a g e Feet c t _ b o u n d a r y _ f r o m _ m u n i c p i a l t i y ! t y b e e _ p o l i c e _ d i s t r i 3,300 6,600 9,900 13,200 0 1,650 F i r e S e r v i c e D i s t r i c t s _ O c t 2 0 1 0 District 1 6 5 t h A r g y l e - I s l a B l o o m i n g d a l e C a u s t o n B l u f f G a r d e n C i t y H u n t e r A r m y A i r f i e d l 9 1 1 U n k n o w n E m e r g e n c y D i s p a t c h Z o n e a n d s I s l s I l e o f H o p e S o u t h s i d e F i r e D e p a r t m e n t L i t t l e T y b e e M o n t g o m e r y P o o l e r n t w o r t h P o r t W e S a v a n n a h S e v e n t h D i s t r i c t S k i d a w a y S o u t h s i d e T h u n d e r b o t l T y b e e I s l a n d W a s s a w - O s s a b a w Emergency Management Services e p a r t m e n t T y b e e I s l a n d P o l i c e D M e d S t a r A m b u l a n c e S i t e r t m e n t s E q u i d i s t a n t : T y b e e a n d S o u t h s i d e F i r e D e p a T y b e e I s l a n d F i r e D e p a r t m e n t S o u t h s i d e F i r e D e p a r t m e n t M e d S t a r A m b u l a n c e S i t e Tuesday, October 26, 2010 21
Tuesday, October 26, 2010 22
Emergency Services * *Based on data provided by the Savannah - Chatham PD, Tybee Island PD, CEMA, Tybee Island Fire Department, and U.S. Coast Guard Water 7 Marinas located along the corridor = 0 public Tybee Island two water-born vessels - 1 direct beach launch capacity Savannah - Chatham PD no marine patrol watch beyond Bull River Air 7 Helipad areas (defined by 100ft x 100ft cleared upland) 1+ Coast Guard helicopters available (no MOU/LOA) when not supporting LNG or Savannah River vessel protection. Land Hwy 80 Emergency Jurisdiction not Tybee Island, yet only method of connectivity Metro PD not frequently able to offer patrol units to reduce speed along Hwy 80 Largest Traffic Incident Area near Bull River Bridge (Hwy 80 & Johnny Mercer) Private shuttle and electric car business available on Tybee Island Known central activity hubs Tuesday, October 26, 2010 23
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