Antigua

1
Antigua Topography
Points of Interest
1. St. Johns Main town, with the harbour at the
end of a deep inlet. Includes commercial,
recreational, and fishing facilities.
1
2. Parham Town and harbour at the end of a
broad, shallow bay. Important desalinization and
power plants at Crabs Peninsula, 2 Km northeast
of the town. Flood plain west of town.
1
2
3. English and Falmouth Harbours International
yachting centers.
4. Jolly Harbour Major resort complex with hotel
on beach and yacht harbour dredged from natural
lagoon.
Notes 1. Roads are shown for visual reference
only. 2. Waves and surges for Points of Interest
are reported from the nearest cell offshore.
3
4
3
Topo. Map
Directory
Grid
British West Indies
Projection
Transverse Mercator Spheroid

Clarke 1880 Unit of Measurement

Meter Meridian of Origin
62 West of Greenwich Latitude of
Origin
Equator Scale Factor at
Origin
0.9995 False Co-ords of Origin
400,000 m Easting, Nil Northing Datum

USNHO Astro 1943 Molodensky dx/dy/dz
-270
13 62 Resolution
6 arc-seconds. ( 182.5 m) The model
used great-circle distances on the WGS84 datum.
Scale varies with output device Letter paper,
8½ X 11 1/172,000 15
monitor 1/160,000 17 monitor 1/141,000 19
monitor 1/126,000 APPROXIMATELY
N
2
Winds
Probability 10 / year, 10-Year Return Time
Antigua
1. St. Johns Downtown
27 m/s East side of
town 32 m/s
1
2. Parham Desalinization plant
31 m/s Waterfront by town
29 m/s Hill above
town 33 m/s
2
3. English and Falmouth Harbours
Nelsons Dockyard 30 m/s
Falmouth SE
25 m/s Falmouth NW
32 m/s
4
4. Jolly Harbour Channel entrance
27 m/s Inner boat
basin 26 m/s
Beach front 28
m/s
N
3
Directory
Topo. Map
3
Waves
Probability 10 / year, 10-Year Return Time
Antigua
1. St. Johns Waterfront by market
1.3 m North of Rat
Island 1.1 m
Cruise Ship terminal 0.1 m
Week Point
3.0 m
1
2. Parham Desalinization plant
1.6 m Waterfront by town
1.4 m Flood
plain west of town 0.9 m
2
3. English and Falmouth Harbours
Nelsons Dockyard 1.2 m
Falmouth SE
1.2 m Falmouth NW
1.5 m
4
4. Jolly Harbour Channel entrance
1.2 m Inner boat
basin 1.2 m
Beach front
1.1 m
N
3
Directory
Topo. Map
4
Surges
Probability 10 / year, 10-Year Return Time
Antigua
1. St. Johns Waterfront by market
0.4 m North of Rat
Island 0.4 m
Cruise Ship terminal 0.4 m
1
2. Parham Desalinization plant
0.5 m Waterfront by town
0.6 m Flood
plain west of town 0.2 m
2
3. English and Falmouth Harbours
Nelsons Dockyard 0.2 m
Falmouth SE
0.2 m Falmouth NW
0.2 m
4
4. Jolly Harbour Channel entrance
0.3 m Inner boat
basin 0.3 m
Beach front
0.3 m
N
3
Directory
Topo. Map
Note surges are reported as elevation above sea
level, not depth of water.
5
Winds
Probability 4 / year, 25-Year Return Time
Antigua
1. St. Johns Downtown
36 m/s East side of
town 40 m/s
1
2. Parham Desalinization plant
39 m/s Waterfront by town
37 m/s Hill above
town 42 m/s
2
3. English and Falmouth Harbours
Nelsons Dockyard 38 m/s
Falmouth SE
33 m/s Falmouth NW
41 m/s
4
4. Jolly Harbour Channel entrance
36 m/s Inner boat
basin 35 m/s
Beach front 36
m/s
N
3
Directory
Topo. Map
6
Waves
Probability 4 / year, 25-Year Return Time
Antigua
1. St. Johns Waterfront by market
1.3 m North of Rat
Island 1.3 m
Cruise Ship terminal 1.0 m
Week Point
3.3 m
1
2. Parham Desalinization plant
1.6 m Waterfront by town
1.7 m Flood
plain west of town 0.5 m
2
3. English and Falmouth Harbours
Nelsons Dockyard 1.3 m
Falmouth SE
1.3 m Falmouth NW
1.5 m
4
4. Jolly Harbour Channel entrance
1.3 m Inner boat
basin 1.3 m
Beach front
1.3 m
N
3
Directory
Topo. Map
7
Surges
Probability 4 / year, 25-Year Return Time
Antigua
1. St. Johns Waterfront by market
0.7 m North of Rat
Island 0.8 m
Cruise Ship terminal 0.7 m
1
2. Parham Desalinization plant
0.8 m Waterfront by town
1.0 m Flood
plain west of town 1.8 m
2
3. English and Falmouth Harbours
Nelsons Dockyard 0.3 m
Falmouth SE
0.3 m Falmouth NW
0.4 m
4
4. Jolly Harbour Channel entrance
0.5 m Inner boat
basin 0.6 m
Beach front
0.6 m
N
3
Directory
Topo. Map
Note surges are reported as elevation above sea
level, not depth of water.
8
Winds
Probability 2 / year, 50-Year Return Time
Antigua
1. St. Johns Downtown
40 m/s East side of
town 46 m/s
1
2. Parham Desalinization plant
45 m/s Waterfront by town
42 m/s Hill above
town 47 m/s
2
3. English and Falmouth Harbours
Nelsons Dockyard 42 m/s
Falmouth SE
36 m/s Falmouth NW
47 m/s
4
4. Jolly Harbour Channel entrance
40 m/s Inner boat
basin 40 m/s
Beach front 40
m/s
N
3
Directory
Topo. Map
9
Waves
Probability 2 / year, 50-Year Return Time
Antigua
1. St. Johns Waterfront by market
1.4 m North of Rat
Island 1.4 m
Cruise Ship terminal 1.2 m
Week Point
3.6 m
1
2. Parham Desalinization plant
1.7 m Waterfront by town
1.8 m Flood
plain west of town 0.6 m
2
3. English and Falmouth Harbours
Nelsons Dockyard 1.4 m
Falmouth SE
1.4 m Falmouth NW
1.6 m
4
4. Jolly Harbour Channel entrance
1.5 m Inner boat
basin 1.4 m
Beach front
1.5 m
N
3
Directory
Topo. Map
10
Surges
Probability 2 / year, 50-Year Return Time
Antigua
1. St. Johns Waterfront by market
1.0 m North of Rat
Island 1.0 m
Cruise Ship terminal 1.0 m
1
2. Parham Desalinization plant
1.1 m Waterfront by town
1.3 m Flood
plain west of town 2.4 m
2
3. English and Falmouth Harbours
Nelsons Dockyard 0.4 m
Falmouth SE
0.5 m Falmouth NW
0.6 m
4
4. Jolly Harbour Channel entrance
0.8 m Inner boat
basin 0.9 m
Beach front
0.9 m
N
3
Directory
Topo. Map
Note surges are reported as elevation above sea
level, not depth of water.
11
Winds
Probability 1 / year, 100-Year Return Time
Antigua
1. St. Johns Downtown
47 m/s East side of
town 51 m/s
1
2. Parham Desalinization plant
50 m/s Waterfront by town
47 m/s Hill above
town 53 m/s
2
3. English and Falmouth Harbours
Nelsons Dockyard 48 m/s
Falmouth SE
41 m/s Falmouth NW
52 m/s
4
4. Jolly Harbour Channel entrance
45 m/s Inner boat
basin 44 m/s
Beach front 45
m/s
N
3
Directory
Topo. Map
12
Waves
Probability 1 / year, 100-Year Return Time
Antigua
1. St. Johns Waterfront by market
1.6 m North of Rat
Island 1.5 m
Cruise Ship terminal 1.3 m
Week Point
3.6 m
1
2. Parham Desalinization plant
1.8 m Waterfront by town
2.1 m Flood
plain west of town 0.8 m
2
3. English and Falmouth Harbours
Nelsons Dockyard 1.6 m
Falmouth SE
1.6 m Falmouth NW
1.7 m
4
4. Jolly Harbour Channel entrance
1.6 m Inner boat
basin 1.6 m
Beach front
1.7 m
N
3
Directory
Topo. Map
13
Surges
Probability 1 / year, 100-Year Return Time
Antigua
1. St. Johns Waterfront by market
1.3 m North of Rat
Island 1.4 m
Cruise Ship terminal 1.2 m
1
2. Parham Desalinization plant
1.5 m Waterfront by town
1.7 m Flood
plain west of town 2.9 m
2
3. English and Falmouth Harbours
Nelsons Dockyard 0.6 m
Falmouth SE
0.6 m Falmouth NW
0.8 m
4
4. Jolly Harbour Channel entrance
1.1 m Inner boat
basin 1.2 m
Beach front
1.2 m
N
3
Directory
Topo. Map
Note surges are reported as elevation above sea
level, not depth of water.