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JM4
N
DM
3
NM
3
WM
3
SM
6
VM
5
EM
2
PM
7
TM
6
MM
15
Ho
ng
Ko
ng
Isl
and
Sh
enzh
en
Ko
wlo
on
New
Ter
rito
ries
Lan
tau
Isl
and
Fig
ure
5
S
ele
cte
d m
ari
ne
wa
ter
qu
ali
ty m
on
ito
rin
g s
tati
on
s i
n 1
0 W
ate
r C
on
tro
l Z
on
es
Wa
ter
Co
ntr
ol
Zo
ne
1T
olo
Har
bou
r &
Ch
anne
l
2S
outh
ern
3P
ort
Sh
elte
r
4Ju
nk
Bay
5D
eep
Ba
y
6M
irs B
ay
7N
ort
h W
este
rn
8W
est
ern
Buf
fer
9E
aste
rn B
uffe
r
Vic
toria
Har
bou
r10
5
7
2
3
6
810
4
9
1
1
10
100
1000
10000
100000
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
E.coli
(cf
u/1
00
mL
)
0
1
2
3
4
5
6
7
8
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
To
tal N
itro
ge
n (
mg
/L)
0
1
2
3
4
5
6
7
8
9
10
11
12
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
Dis
solv
ed
Oxy
gen
(m
g/L
)
Figure 6-a: Depth-averaged dissolved oxygen, E.coli and total nitrogen levels at DM3 in the Deep Bay WCZ
Figure 6-b: Depth-averaged dissolved oxygen, E.coli and total nitrogen levels at NM3 in the North Western WCZ
E.coli
(cf
u/1
00
mL
)
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
To
tal N
itro
ge
n (
mg
/L)
1
10
100
1000
10000
100000
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
0
1
2
3
4
5
6
7
8
9
10
11
12
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
Dis
solv
ed
Oxy
gen
(m
g/L
)
0
1
2
3
4
5
6
7
8
9
10
11
12
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
Dis
solv
ed
Oxy
gen
(m
g/L
)
Figure 6-c: Depth-averaged dissolved oxygen, E.coli and total nitrogen levels at SM6 in the Southern WCZ
E.coli
(cf
u/1
00
mL
)
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
To
tal N
itro
ge
n (
mg
/L)
1
10
100
1000
10000
100000
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
0
1
2
3
4
5
6
7
8
9
10
11
12
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
Dis
solv
ed
Oxy
gen
(m
g/L
)
Figure 6-d: Depth-averaged dissolved oxygen, E.coli and total nitrogen levels at WM3 in the Western Buffer WCZ
E.coli
(cf
u/1
00
mL
)
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
To
tal N
itro
ge
n (
mg
/L)
1
10
100
1000
10000
100000
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
1
10
100
1000
10000
100000
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
E.coli
(cf
u/1
00
mL
)
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
To
tal N
itro
ge
n (
mg
/L)
0
1
2
3
4
5
6
7
8
9
10
11
12
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
Dis
solv
ed
Oxy
gen
(m
g/L
)
Figure 6-e: Depth-averaged dissolved oxygen, E.coli and total nitrogen levels at VM5 in the Victoria Harbour WCZ
0
1
2
3
4
5
6
7
8
9
10
11
12
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
1
10
100
1000
10000
100000
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
E.coli
(cf
u/1
00
mL
)
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
To
tal N
itro
ge
n (
mg
/L)
Dis
solv
ed
Oxy
gen
(m
g/L
)
Figure 6-f: Depth-averaged dissolved oxygen, E.coli and total nitrogen levels at JM4 in the Junk Bay WCZ
1
10
100
1000
10000
100000
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
E.coli
(cf
u/1
00
mL
)
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
To
tal N
itro
ge
n (
mg
/L)
0
1
2
3
4
5
6
7
8
9
10
11
12
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
Dis
solv
ed
Oxy
gen
(m
g/L
)
Figure 6-g: Depth-averaged dissolved oxygen, E.coli and total nitrogen levels at EM2 in the Eastern Buffer WCZ
1
10
100
1000
10000
100000
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
E.coli
(cf
u/1
00
mL
)T
ota
l Nitr
og
en
(m
g/L
)
Figure 6-h: Depth-averaged dissolved oxygen, E.coli and total nitrogen levels at TM6 in the Tolo Harbour WCZ
0
1
2
3
4
5
6
7
8
9
10
11
12
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
Dis
solv
ed
Oxy
gen
(m
g/L
)
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
a
12.8
1
10
100
1000
10000
100000
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
E.coli
(cf
u/1
00
mL
)
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
To
tal N
itro
ge
n (
mg
/L)
0
1
2
3
4
5
6
7
8
9
10
11
12
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
Dis
solv
ed
Oxy
gen
(m
g/L
)
Figure 6-i: Depth-averaged dissolved oxygen, E.coli and total nitrogen levels at PM7 in the Port Shelter WCZ
1
10
100
1000
10000
100000
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
E.coli
(cf
u/1
00
mL
)
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
To
tal N
itro
ge
n (
mg
/L)
Figure 6-j: Depth-averaged dissolved oxygen, E.coli and total nitrogen levels at MM15 in the Mirs Bay WCZ
Dis
solv
ed
Oxy
gen
(m
g/L
)
0
1
2
3
4
5
6
7
8
9
10
11
12
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
Fig
ure
7
F
requ
ency
of
red
tides
in 1
0 W
ater
Con
trol
Zon
es in
Hon
g K
ong,
198
0 -
2004
Sou
rce:
A
gric
ultu
re,
Fis
herie
s an
d C
onse
rvat
ion
Dep
artm
ent
and
Env
ironm
enta
l Pro
tect
ion
Dep
artm
ent
She
nzhe
n
New
Ter
ritor
ies
Lant
au I
slan
dH
ong
Kon
g Is
land
Kow
loon
N
0246810
8082
8486
8890
9294
9698
0002
04
Dee
p B
ay W
CZ
0246810
8082
8486
8890
9294
9698
0002
04
Nor
th W
este
rn W
CZ
0246810
8082
8486
8890
9294
9698
0002
04
Wes
tern
Buf
fer
WC
Z
05101520
8082
8486
8890
9294
9698
0002
04
Sou
ther
n W
CZ
0246810
8082
8486
8890
9294
9698
0002
04
Vic
toria
Har
bour
WC
Z
0246810
8082
8486
8890
9294
9698
0002
04
Junk
Bay
WC
Z
0246810
8082
8486
8890
9294
9698
0002
04
Eas
tern
Buf
fer
WC
Z
05101520
8082
8486
8890
9294
9698
0002
04
Por
t S
helte
r W
CZ
051015202530354045
8082
8486
8890
9294
9698
0002
04
Tol
o H
arbo
ur &
Cha
nnel
WC
Z
05101520
8082
8486
8890
9294
9698
0002
04
Mirs
Bay
WC
Z
