goal: “to be conscientious stewards of our unique historic and culturaL heritage, environmental resources, and diverse economic community” CHATHAM COUNTY
GEORGIA
SOUTHEAST USA
PHASE ONE
TYBEE ISLAND
PHASE TWO
PHASE THREE
SOMETIME AROUND 2050...
SOMETIME AROUND 2100...
CURRENTLY EXISTING ON SITE:
IMPACT OF 3 FEET OF SEA LEVEL RISE:
IMPACT OF 5 FEET OF SEA LEVEL RISE:
238 STRUCTURES
238 STRUCTURES- 81% INUNDATED BY WATER
238 STRUCTURES- 98% INUNDATED BY WATER
208 single family residential 168 high density residential 24 commercial units 6 institutional units
REMAINING: 36 single family residential 0 high density residential 14 commercial units 5 institutional units
REMAINING: 0 single family residential 0 high density residential 0 commercial units 5 institutional units
LEGEND
LEGEND
commercial
commercial
low density residential
low density residential
high density residential
high density residential
mixed use
mixed use
institutional & civic
institutional & civic
phase out zoning policy
phase out zoning policy
existing parks & greenspace
existing parks & greenspace
proposed parks & greenspace
proposed parks & greenspace
marsh & conservation land
marsh & conservation land
dune restoration
dune restoration
living shoreline development
vegetative berm
historic district
historic district
proposed dune crossover
proposed dune crossover
LEGEND commercial low density residential high density residential mixed use institutional & civic phase out zoning policy existing parks & greenspace proposed parks & greenspace
IMPLEMENT POLICY REQUIRING STRUCTURES ON MARSH HAMMOCKS TO PHASE OUT AND RETURN TO MARITIME FOREST, WHICH SERVES AS A NATURAL STORM SURGE BUFFER
DEVELOP LIVING SHORELINES TO STRENGTHEN BANKS OF ACTIVE MARSH WATERWAYS
marsh & conservation land dune restoration
vegetative berm historic district
DUNE RESTORATION ON ALL COASTAL EDGES FOR PROTECTION AGAINST STORM SURGE AND RISING SEA LEVELS
RAISE HIGHWAY 80 TO AN ELEVATED BRIDGE THAT RECONNECTS PREEXISTING WATERWAYS
HIGHER WATER LEVELS IN THE INLAND MARSH OFFER OPPORTUNITIES FOR OUTDOOR RECREATION,EDUCATION, AND ECOTOURISM
BLOCK TIDAL CONNECTIVITY TO INLAND MARSH AS SEA LEVELS RISE TO HEIGHTS THAT WOULD DAMAGE EXISTING PROPERTY AND HABITAT
IMPLEMENT POLICY REQUIRING STRUCTURES ALONG MARSH EDGE TO PHASE OUT BY 2030
IMPLEMENT POLICY REQUIRING ALL NEW STRUCTURES BE BUILT WITH FLOODABLE GROUND FLOORS AND STORMWATER COLLECTION CISTERNS OR GREENROOFS
CONSTRUCT TIDE GATES ON CASON AVE AND LEWIS AVE BRIGDES TO CONTROL THE FLOW OF TIDAL WATERS TO THE INLAND MARSH AS SEA LEVELS RISE
CONSTRUCTION OF VEGETATIVE BERM TO CREATE A RESILIENT BUFFER THAT WILL MEDIATE RISING SEA LEVELS AND PROTECT INLAND PROPERTY AND HABITAT
SOONER
CREATE A VEGETATIVE CHANNEL FOR NATIVE WILDLIFE TO CROSS BETWEEN THE COASTAL MARSH AND INLAND MARSH WITHOUT CROSSING HIGHWAY 80
4’ SLR
PHASE TWO
PHASE ONE
LIVING SHORELINE DEVELOPMENT
IMPLEMENT POLICY REQUIRING STRUCTURES ON REMAINING HIGH POINTS ON THE ISLAND TO PHASE OUT AND RETREAT TYBEE ISLAND AS SEA LEVELS RISE BEYOND MEDIATION
INLAND MARSH RESTORATION TO MEDIATE STORM SURGE AND FLOODING, AND TO CREATE HABITAT AND OUTDOOR RECREATION SPACE
3’ SLR
2’ SLR
1’ SLR
5’ SLR
LATER
PHASE THREE
DUNE RESTORATION
BEFORE
6’ SLR
bridge at cason ave before berm mediation
AFTER
5’ SLR
BERM MEDIATION OF 5 FEET OF SEA LEVEL RISE:
bridge at cason ave after berm mediation
233 STRUCTURES- 0% INUNDATED BY WATER 5’ SLR
s
eetgrass sw
se
p
lane urs
BERM DEVELOPMENT
PHASED OUT FOR BERM CONSTRUCTION: 3 single family residential 2 commerical units
o
b a gs r e t ys r bags te ys
e bbag palm ca
h pi n e las
ashore eld er
m
th cordgrass o o
o
REMAINING: 205 single family residential 168 high density residential 22 commercial units 6 institutional units
s
berm, highway 80 and commercial units
5’ SLR
ROADS AND BUILDING FOOTPRINTS
n d li sa
ve oa
k
yu
cca
da
y
m
in g orn glor
WATER TREATMENT FACILITY
SAVANNAH RIVER
12’
G
TIN
S EXI
TYBEE RECYCLING CENTER
S
S
y
rn wax my
e rtl
he
hoon holl
12’
EXISTING LAND USE SAVANNAH RIVER
s ou t
E DUN
G
TIN
S EXI
E DUN
POLICE STATION EXISTING HIGH DENSITY RESIDENTIAL
RIVER’S END RV PARK & CAMPSITE
n muh ly iraw a h
wi
tchgrass
nd
i
adow cord me
s
d cordgrass t
an
sal
r panicum tt e i b
s
s
s
oats
ian blanket f
sunfl ow ach e e b
r
ea
r we lo
oth cordgr a
ass gr
mo
ss
ind i
shore salt
ss
a se
AND ON ATI T E VEG OREST F NG ME STI EXI MARITI
fl y milk w tt er u b
d ee
blanket fl
ea verl f cro sil
n to
an
gra
m w pal ett o sa
er ow
upon holly ya
AND ON ATI T E VEG OREST F NG STI ITIME I X E MAR
TYBEE ISLAND LIGHTHOUSE & FORT SCREVEN
INLAND WETLAND RESTORATION
er p itt
a n i cu m
m a lt
s
b
ats
eadow cord
EXISTING COMMERCIAL HUB
gra
ss
o ea
s
TIME
SEA LEVEL RISE
proposed dune crossover
HEAVY TRAF FIC COMMERCIAL POTENTIAL PROPOSED VEGETATIVE BERM
5’ SLR
COASTAL SALTWATER MARSH
STORM SURGE JENNA DOTSON | LAND 4060 | TYBEE ISLAND SITE DESIGN | SPRING 2017 | PARDUE
EXISTING ECOLOGICAL FACTORS
COASTAL SALTWATER MARSH
PUBLIC GREENWAY OVERLAND HABITATCONNECTIVITY
ECOLOGICAL DESIGN FORCES
TYBEE ISLAND WEDDING CHAPEL
ECONOMIC AND SOCIAL DESIGN FORCES
LINES AND SHAPES AS DESIGN FORCES