EA-South West/0G*26
3
DEVON AREA
INTERNAL REPORT
URBAN WASTE WATER
TREATMENT DIRECTIVE.
TAW ESTUARY SENSITIVE AREA
(EUTROPHIC).
SUBMISSION
FEBRUARY 1997
Author: G. CLARK
SURVEY OFFICER
G R Bateman
Area Manager (Devon)
I
E n v ir o n m e n t
A gency
NATIONAL LIBRARY &
INFORMATION SERVICE
SO UTH WEST REGION
M anley H ouse. Kestrel Way.
Exeter EX2 7LQ
CONTENTS
1.
FORM A - COVER SHEET
2.
FORM D -ESTUARINE WATERS
3.
FORM F
A.
APPEND DC A - SPOT SAMPLES FROM TAW ESTUARY 1994-96
- '
(including mean, max, min and standard deviation)
5
APPENDIX B - PLANKTONIC ALGAL BLOOMS DATA
6.
APPENDIX C - MACROALGAE DATA
7.
APPENDIX D - MARINE INVERTEBRATE DATA
8.
APPENDIX E - PHOTOGRAPHS OF ALGAL SCUM
9.
APPENDIX F - COMPLAINTS FROM PUBLIC
10.
APPENDIX G - CONTINUOUS MONITORING DATA SHOWING DIURNAL
DO% sat FLUCTUATIONS
II
APPENDIX H, I, J, K - MODELLING DATA
12
APPENDIX L - TON v SALINITY SCATTER GRAPHS
(^A
CVq.^ ( o o ' 2 <^
RefCode ..SW...............................
EC URBAN WASTE WATER TREATMENT & NITRATE DIRECTIVES
Candidate Sensitive Area [Eutrophic] / Polluted Waters [Eutrophic]
FORM A: COVER SHEET
(use for all types o f SAfEl/PWfEI
1)
Name of regulator: Environment Agency, South West Region, Devon Area
(see note I on guidance sheet)
2)
Candidate name:
3)
Main river catchment:
River Taw
(see note 2 on guidance sheet)
4)
Location & extent of candidate:
Taw Estuary
From the top of the estuary at:
NGR: SS 5695 2832 River Taw at Newbridge
To the mouth of the Taw estuary at:
NGR: SS 4700 3200 Off Crow Point
(map should be included, see note 3 on guidance sheet)
5)
Type of candidate (tick box)\
Running freshwater
□
□
Estuary
□ /
Coastal
□
Sensitive Area [Eutrophic]
□ /
Polluted Water [Eutrophic]
□
Both
□
Still freshwater
6)
Is the candidate:
(see note 4 on the guidance sheet fo r definitions)
7)
Is the candidate:
Eutrophic now
□ /
At risk of becoming eutrophic
D
(see note 5 on guidance sheet fo r definitions)
8)
In May 1994, was the candidate :
Designated as an SA[E]
Withdrawn/not designated due to insufficient evidence
□
□
Not proposed
9)
Summary of qualifying discharges (ie greater than p.e 10,000 - see note 6 on guidance
sheet)
Name of discharge
Barnstaple (Ashford)
Direct/Indirect
Direct
NGR
SS5325 3406
Population
Equivalent
64500
(DWF 10314
m3 / day)
C urrent level
of treatm ent
Primary Settlement
Baff Plant
Discharge to estuary
* UV treatment due to be installed mid 1997.
Now progress to the relevant form fo r the Sensitive Area, also submitting a fo rm F fo r each
qualifying discharge
Form
Form
Form
Form
Form
B - Running Freshwaters
C - Still Waters
D - Estuarine
E - Coastal
F - Effects o f nutrient removal at qualifying discharge
Ref. Code ...,SW
EC URBAN WASTE WATER TREATMENT & NITRATE DIRECTIVES
Candidate Sensitive Area [Eutrophic] / Polluted Waters [Eutrophic]
FORM D: ESTUARINE WATERS - Information & Data
1)
Candidate name
Taw Estuary
2)
Extent of SA[E]/PW[E]
Start point
Newbridge on River Taw
Start NGR
SS 5695 2832
Endpoint
Off Crow Point
End NGR
SS 4700 3200
Length
23 km
3)
Attach map showing SA[E]/P W[E] and locations of chemical sample points, biological
sample points, any qualifying discharges and any other significant discharges.
4)
Approximate retention/ flushing time
days
Order of 2/3 days, but can be highly variable depending on river flow.
5)
Brief description of geomorphological nature o f estuary (eg. broad and fla t, deep and
jjord-like, salinity regime, stratification etc)
The Upper reaches of the estuary occupy a narrow winding channel w ith a typically
muddy substrate. The middle and lower reaches are broad, although at low tide the water
occupies narrow channels, bordered by intertidal mud and sand banks. The bottom end
which is joined by the Torridge estuary is short and broad, having extensive sand and
gravel banks. A substantial sand bar across much of the mouth is exposed at low water
(see detailed map).
Above Barnstaple, the estuary is semi riverine, ie. it experiences tides while being
predominantly freshwater with surface salinity typically below 5 practical salinity units
(PSU), for most of the tidal cycle. The extent of this low salinity area within the estuary
is sensitive to river flow, with high river flows causing freshwater to move further down
the estuary. Within this vicinity, particularly following sudden increases in river flow, the
water can become stratified with lower salinity water overlying higher salinity water with
limited vertical mixing o f the waterbodies. These features are not permanent in part due
to the veiy shallow channels present at low water. By contrast, the bottom end o f the
estuary which includes the Torridge estuary is dominated by the influx o f coastal water
and is vertically well mixed showing no significant differences in salinity through the
water column (see detailed map).
The Taw estuary provides a recreational area for a wide range of activities for both local
people and tourists. There is a well developed system of public footpaths and cycling
routes around the entire estuary. This is better known as the Tarka Trail and provides
reasonable access to the estuary and coastal surrounds for bird watchers. A ngling takes
place throughout the estuary both from the shore and boats. Boating incorporates a
variety o f leisure activities and is largely concentrated at the lower end o f the estuary
around Appledore, Crow Point and Instow.
Mussels, oysters, cockles and winkles all grow naturally on the many areas o f shellfish
beds within the Taw estuary. Commercial exploitation of shellfisheries within the
estuary was a valuable industry however, shellfish harvesting for commercial purposes
is restricted under the EC Shellfish Hygiene Directive(91/492/EEC) due to
microbiological contamination o f shellfish flesh. Under the EC Shellfish Hygiene
Directive, shellfish harvesting in the estuary has been identified as either Class C, where
shellfish require long periods of relaying prior to marketing, or Class D where shellfish
harvesting is prohibited.
The estuary has runs o f salmon and sea trout from May to September en route to the main
spawning beds within the R.Taw catchment.
6)
Summary of main uses and designations (tick boxes)
Amenity
/
Boating
Watersports
/
PARCOM potential
problem area
/
EC Bathing Water
/
Angling
/
Passage o f
migratory fish
/
Designated EC
Shellfish Water
Designated EC
Shellfish
Harvesting Area
/
Non - designated
shellfish harvesting
area
/
Other designations and uses (specify - see guidance note 22)
7)
If watercourse has conservation status provide details (see guidance note 23) :
The estuary was renotified as a SSSI in 1988. There is a RSPB reserve at Isley Marsh. South
o f the estuary mouth is an area o f sandy beach, pebble ridge and the sand dunes o f Northam
Burrows which has been notified as a SSSI and an AONB. North of the estuary, Braunton
Burrows, an extensive area o f sand dunes have been identified as a NNR and a United Nations
Educational, Scientific and Cultural Organisation (UNESCO) Biosphere Reserve (see detailed
map).
8)
What chemical data are available ?
(tick boxes i f evidence is supplied - see guidance note 24)
Dissolved available inorganic
phosphorus
□
Dissolved available inorganic
nitrogen
□
9)
10)
11)
Chlorophyll a
OS
see Appendix A
Cell.counts
OS
see Appendix B
What biological / observational data are available ?
(tick boxes i f evidence is supplied - see guidance note 25)
Macroalgae
OS
see Appendix C
Planktonic algal blooms
OS
see Appendix B
Sh'fish/inverteb./fish mort.
OS
see Appendix D
Appearance of scum/foam
OS
see Appendix E
Photographs
OS
Which of the DoE numeric criteria are exceeded?
Chlorophyll a
O s
Cell counts
DS
Other evidence of adverse effects (see guidance note 26)
No adverse effects have been reported concerning the uses identified under Q6. Within the
estuary samples are collected under the Dangerous Substances Directive as well as the UWWTD.
Under the Dangerous Substances Directive there are no exceedences of standards. PARCOM
sampling was undertaken from Barnstaple (Ashford) STW between 1991 and 1993 with no
adverse effects noted, however the STW does receive industrial effluent so the potential exists.
A number of complaints have been received by members o f the public concerning bloom
sightings. These are detailed under Appendix F. Photographic evidence of bloom conditions are
included as Appendix E.
________________________ _____ ___________________
12)
Executive summary of the chemical, biological and other evidence illustrating
eutrophication in the SA[E]/PW[E] (see note 27 in the guidance sheet).
Evidence of eutrophication as follows: spot sample chemical data - elevated DO% readings
during summer daytime sampling; enhanced winter nitrogen concentrations to background - see
Appendix A. Continuous chemical data - diurnal fluctuations during summer months - see
Appendix G. Biological data - Chlorophyll A values exceeding lOug/1 - these values have been
graphically illustrated and clearly show very high Chlorophyll A levels associated with summ er
months; bloom densities in excess of 5x105 cells/1 - see Appendices A and B.____________
In addition there is photographic evidence o f algal scum - see Appendix E. The sequence o f
photographs shown indicates a algal scum slick covering a distance of approxim ately 7 km i.e
from sampling site E30A8 to just above sampling site E30A6 - see enclosed map. Slicks o f this
nature are common in the estuary as indicated by the complaints enclosed under Appendix F and
are clearly visible from the banks o f the estuary.
13)
Summary of eutrophicationcontrol measures (already in progress and/or already planned)
if any, for the candidate area. (see note 28 on the guidance sheet).
N/A
14)
If the S A[E]/PW[E] has previously been designated, is there any evidence to suggest that
its status has changed (eg. it is no longer eutrophic) or that the control measures have
been effective?
N/A
Ref. No. ...SW ...............................
EC URBAN WASTE WATER TREATMENT & NITRATE DIRECTIVES
Candidate Sensitive Area [Eutrophic] / Polluted Waters [Eutrophic]
FORM F: EFFECTS OF NUTRIENT REMOVAL AT QUALIFYING DISCHARGE
Name of
qualifying
discharge
(> 1 0 ,0 0 0 PE)
Direct/Indirect
(see guidance
note 29)
NGR
Population
Equivalent
Current level
of treatment
Barnstaple
(Ashford)
Direct
SS 5325
3406
64,500
Primary
Settlement
Baff Plant
Discharge to
Estuary
*
*UV Treatment due to be installed mid 1997.
1)
2)
3)
Name of Candidate Sensitive Area [Eutrophic]
Taw Estuary
Type of candidate (tick box):
Still freshwater
O
Running freshwater
O */
Estuary
D
Coastal
O
Summarise the evidence of the impact of the discharge (eg compare chemical and
biological data upstream and downstream of the sewage discharge - see guidance
note 30)
Summary details of biological and chemical surveys carried out are as follows:__________
Chemical - Spot samples were collected from eight sites, four from within the estuary and
four from freshwater inputs - estuarine:- E30A8, E30A7, E30A6, E30A5; freshw ater:-
R30A002, R30A006, R30A004, R30B005 (see detailed map). Of the four sites within the
estuary, two were continuously monitored - samples were collected between 1994 and
1996. Biological - Macrobenthic surveys were carried out within the estuary during 1992
from subtidal and intertidal sand areas. Phytoplankton samples were collected from the
same sites used for chemical monitoring within the estuary. Macroflora aerial surveys
were carried out over the entire length of the estuary during 1995 and 1996.____________
There was no significant difference between upstream and downstream data.____________
4)
Summarise the results of any nutrient removal modelling or other im pact
assessments carried out for this discharge or, if relevant, for the w hole catchment.
(see guidance note 31)
Nutrients involved for modelling purposes were nitrogen in the form o f T IN (Total
Inorganic Nitrogen) and TON (Total Oxidised Nitrogen). The model used was EcoS, a
1-D model developed by Plymouth Marine Laboratory. Data covered the period from the
1st Jan 1994 to the 31st October 1996. For part of the report, only data for 1995 was used
as this was the only complete calendar year available. Although there are three effluent
discharges into the estuary - Velator, Yelland and Ashford (see detailed map and Appendix
H) only the impact of nutrient removal at Ashford was modelled. Velator w ill be connected
to Ashford within 18 months and it is planned to connect Yelland to a new ST W at________
Cornborough with a marine outfall by 2000.___________________________________________
Modelling results for 1995 show:- a) the four sites within the estuary showed elevated_____
nitrogen levels during the winter months - see Appendix I; b) the same sites during the
summer months showed decreased levels of nitrogen when the nutrient loadings from______
Ashford were suppressed - see Appendix J; c) a similar situation arose from two__________
modelled sites located 500m upstream and downstream o f the Ashford discharge except this
covered the whole of 1995 - see Appendix K.__________________________________________
5)
Do the benefits of nutrient removal at the qualifying discharge depend on nutrient
removal at other discharges? (see guidance note 32)
Although there is loading from other discharges i.e. Yelland and Velator, their impact was
not considered since, as indicated in 4) above, the nature of the current discharge regime
will change. These changes will increase the loading from Ashford but reduce the overall
loading to the Taw estuary._________________________________________________________
From the detailed map it is clear that the Taw estuary is influenced by the Torridge_______
estuary. There is one significant discharge that enters the lower end of this estuary,______
Bideford Fine Screening (see detailed map) and there is therefore the possibility that the
effects of this discharge could contribute to the eutrophic conditions observed in the Taw
estuary (it should be noted that the algal blooms observed (Appendix E) are not seen in the
Torridge estuary). This discharge is due to be connected to Comborough by 2000._______
From the results shown in Appendix L, there is evidence suggesting higher T O N _________
levels associated with lower saline levels. This would indicate that the freshwater input
into the estuary from the main R.Taw and smaller freshwater discharges contribute to the
nutrient loading. The entire Taw catchment is an area of intensive dairy farm ing, livestock
rearing and fish fanning.___________________________________________________________
6)
Conclusions on impact of discharge and predicted effects of nutrient removal (see
guidance note 33).
The modelling carried out shows that when the discharge from Ashford STW is__________
suppressed there is a reduction in the mean nitrogen levels within the estuary at locations
upstream and downstream. If nutrients are removed from the discharge, it is probable that
the eutrophic conditions will be reduced. In view of the planned changes to the sewage
discharge regime (see 4, 5 above) the reduced load of nutrients into the Taw estuary could
reduce eutrophication. The proposed removal of the discharge into the lower Torridge
estuary could have a similar beneficial effect.Taking these factors into account along with
the effects of freshwater inputs, it is difficult to gauge the benefits of nutrient removal for
Ashford STW. My conclusion is that there is no clear case either way. The estuary should
be given a protective status with the view to examining the effects of the proposals for
Velator, Yelland and Bideford after a period of eighteen months.________________________
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Chlorophyl-A (1990- 1995)
01/02/90
30/07/90
25/03/91
30/03/92
05/05/92
25/02/93
15/09/93
22/02/94
16/06/94
13/12/94
02/03/95
18/05/95
Date
m Chlorophyll-A
- Summer months
-
10 ug/l D O E. Guidance Level I
River Taw - Barnstaple Quay
Chlorophyl-A (1990 - 1995)
500
Chlorophyll-A
ug/l
400
300
200
100
0
01/02/90 30/07/90 11/07/91 05/05/92 25/02/93 04/05/93 22/02/94 04/10/94 13/12/94 09/03/95 09/03/95 13/07/95 10/08/95 17/08/95
Date
Chlorophyll-A
— Summer months
— 10 ug/l D O E Guidance Level
River Taw - Off Ashford S.T.W.
Chlorophyl-A (1990- 1995)
500
Chlorophyll-A
ug/l
400
300
200
100
0
13/06/90
31/07/90
28/11/90
11/07/91
05/05/92
10/09/92
04/05/93
22/02/94
04/10/94
09/03/95
17/08/95
Date
■ Chlorophyll-A
— Summer months
— 10 ug/l D O E Guidance Level
River Taw - Off R.A.F. Chivenor
Chlorophyl-A (1990- 1995)
400
300
200
100
13/06/90
25/03/91
30/03/92
25/02/93
22/02/94
04/10/94
09/03/95
21/06/95
10/08/95
31/07/90
11/07/91
10/09/92
04/05/93
16/06/94
02/03/95
09/03/95
10/08/95
Date
Chlorophyll-A
— Summer months
— 10 ug/l D O E Guidance Level
Appendix A
TAW ESTUARY - BY LITTLE PILL
STD
MEAN
MAX
MIN
Number of samples
Nos exceedinq DOE criteria
pH
Temp
D.O.%
Ammonia
Nitrate
Nitrite
TON
S Solids
Ortho-phos
Salinity
Chloropyhl A
0.29
7.78
8.6
7.4
61
4.347022
9.704412
20
3.7
68
9.269473
95.7541
134
84
61
60.74526
71.25424
230
11
59
1.496246
2.939394
6
0
33
6.796139
16
35
9
32
1.473525
2.915
6.3
0.2
60
138.4139
82.05085
867
3
59
23.34978
41.96721
145
20
61
6.65148't
3.026471
31.5
0
68 ,
57.69093146
39.94520548
284
1
73
36
URN
E30A6
N A M E .................................
TAW ESTUARY ■BARNSTAPLE
DATE
22/02/94
23/02/94
16/06/94
04/10/94
T IM E ~
0655
0656
0040
0041
1510
1511
1512
1513
1700
1701
DEPTH
m
PH
7.5
6.5
6.7
6.7
7.5
6.5
6.5
6.5
7.5
8.6
6.5
17.1
17
17
17
17
18.9
18.0
19.0
10.6
11.5
0.9
0.7
7.0
1.2
11.5
7.0
11.6
11.6
13.6
258
52
106
167
1.5
1.3
252
135
52
50
93
127
163
00
1.4
1
371
88
28
0.33
66
0.35
1.1
69
28
14
21
1.3
52
30
128
157
159
160
131
134
1Z2
122
16
N
03
131
1.9
03
64
03
90
50
2
31
69
90
00
06
61
201
1.1
95
61
8
13.6
00
157
8
13.6
13.6
13.6
00
00
00
160
90
161
97
22
33
31
25
49
3
41
40
3
3
73
71
2
2
24
23
78
2
1801
1
1802
1803
1804
19
3
36
7.9
13/12/94
1420
2
7.6
13.6
11.2
20
14
03/02/95
1500
1507
1650
0010
7.6
7.6
7.6
7.6
11.2
11.1
11.1
8.3
0015
3.6
7.6
7.5
8.2
0.5
90
90
6.1
91
1120
7.8
7.7
*6.1
5.9
91
91
1105
7.6
S.S
97
69
4.5
1000
6.00
19.00
1800
203.00
476 00
191.00
107.00
143.00
20.00
18.00
'
0.99
31
53
0.99
39
54
17.9
18.1
18.1
18
19.0
20.4
21.3
18.00
19.00
1000
11.00
21.5
7.8
0715
0720
3.5
3.6
0.4
7.00
0.4
1.1
7.9
0
0
0
0
0
0
0
0
0
0
0
7.7
8
14.7
14.6
14.8
5.8
5.9
2.5
2.5
50
201
22
1
09/03/95
1.5
60
00
00
1703
1707
1800
02/03/95
177
92
92
92
93
93
93
13.6
13.6
13.6
7.9
1250
13.00
7.5
8.6
2
0
52
0.7
1700
1702
50
221
1.1
0.5
144
2.1
8.9
1035
1038
PHYLL A
VJq/l
172
1
1
2
PPT
92
92
92
1
1
PHOSPHT
jjq/l Tillered
160
2.3
CN LW O " ]
SOLIDS
mq/1
93
93
7.7
1021
1110
1111
1112
1345
1346
1610
1611
0900
0901
'S U S P E N D ' “ O R T H O " ’ s a c in it t “
5.1
5.1
5.4
5.4
6.5
08
2
2.8
FILTERED FiLTERED FILTERED FILTERED
mq/1
mq/1
uq/l
PQ/1
OXYGEN
% SAT
7.8
1702
1703
1020
N IT R IT E S
WATER
DEGC
1
2
22
. . . T 0 |g —
'T E M P 'D T D I S 5 G L W "A M M O N IA " N IT R A T E "
9.00
30
29
21.5
0
a
0
29
23
0
0.1
1.00
1.00
22
21
02
23
37
a
2.00
1.00
2.5
IS
41
0.42
4.00
2.5
63
35
2.20
600
24
2.S
79
34
0.24
2
21
2.7
12
26
0.1
700
300
0.99
3.4
3.3
3.2
25
13
5
4
3.5
10
3.5
16
10
3.5
12
3.7
11
53
27
.
100
1110
1.7
7.6
5.5
95
66
2
22
2.8
11
26
0
3 00
1200
1.2
7.6
5.6
97
65
2
2.0
14
27
0
5.6
5.7
95
96
69
2
2.0
11
27
1300
7.7
7.6
21
22
15
27
5.8
97
21
21
2.8
7.6
2
2
300
3 00
300
1400
62
61
0.1
0
2.9
14
25
0.1
1500
1555
7.6
5.9
97
44
20
2.9
7.7
6
96
43
2
2
19
26
25
0.1
0.1
7.6
7.7
6.1
6.7
96
96
36
34
2
2
18
17
2.9
3
15
16
22
23
0.1
2.9
23
24
01
1210
1710
1600
2.00
2.00
2.00
2.00
3 00
URN’ ‘
NAME
...........
DATE- “ TIME
DEPTH
PH
m
24/04/95
16/03/95
21/06/95
13/07/95
10/08/95
1900
2000
2100
2200
2201
2300
2301
0915
1550
0900
\
1.5
2
1505
0730
1340
0620
1235
0625
0630
0725
0730
0825
0830
0925
3.3
2.5
1.6
1025
1125
1630
04/10/95
6.1
6.2
6.2
6.2
6.2
6.2
6.2
97
97
96
97
96
96
98
35
33
40
29
27
31
29
2
2
2
2
2
2
17
16
15
15
15
16
15
6.1
10.2
8.5
1.6
97
111
20
13
0
1
10
30
6.1
6.2
6.1
8.2
8.1
8.2
8.2
16.4
16.8
16.5
16.6
19
19
19.6
92
91
94
90
90
87
64
36
0
0
0
0
0
0
0
20.5
20.6
21.6
22.7
24.2
95
115
149
170
171
53
75
43
26
37
24.4
24.3
23.3
171
126
122
51
70
179
20.4
86
20.4
90
6.6
8,7
6.7
6.6
6.5
8.2
1625
1725
1625
17/08/95
7.7
7.6
7.6
7.6
7.6
7.6
7.6
8.2
8.3
8.5
1225
1325
1425
1525
3.4
TEMP75F- DfSSULVD "AMMONIA 'NITRATE- “ NITRITE- — TON----- 'SUSPEND' “ QRTHCT ‘ SALINITY"
OXYGEN FILTERED FILTERED FILTERED FILTERED SOLIDS PHOSPHT
WATER
gq/l filtered
PPT
mq/1
mq/l
% SAT
DEGC
uo/l
mg/I
,J M
8.2
2
2.00
300
3 00
2.00
2.00
2.00
2.00
58.00
33 00
20
73
25.7
25.00
12600
129.00
279.00
78.00
66.00
20
21
33
32.5
32.4
32.3
31.7
25
22
3
3
2.9
12
7
10
7
7
0.47
1.9
18
44
34
35
70
56
71
23
22
22
22
22
23
22
20
10
0.15
56
56
21
29
0
0
0
0
11
15
16
0.18
0.24
0.27
62
41
72
29
33
26
17
0.29
0
0
0
16
19
19
10
0.3
0.32
0.33
73
62
64
30
30
33
56
109
33
64
111
29
21
19
0
0.15
0
0
0.5
31.6
25.3
23.6
21.7
18.5
17.8
17.4
16.6
17/11/95
14/02/96
22/02/96
42.00
37.00
60.00
50.00
64.00
68.00
70.00
66.00
99.00
228.00
225 00
150.00
145.00
16.6
120.00
24.6
33
33.4
110.00
23.00
27.00
99.00
1115
1430
0630
89.00
17.00
33.00
1440
01/11/95
PHVLL A
uq/1
0.1
0.1
0.1
0.1
0.1
0
0
15
14
3
3
3
3
CHITORO
5.00
0720
1335
0710
9.00
1300
7.6
7.7
0725
1335
7.5
7.5
4.9
93
33
s
12
5.9
13
23
0.1
2.00
5.4
95
22
5
12
5.9
0615
6
4.6
99
96
2
6
2.2
6
12
21
24
0.1
20.9
1.00
8
5
100
87
1
6
2
16
33
23.1
8
4.1
97
110
3
11
3.3
16
11
105
57
2
4
4
10
16
32
20
19.9
5.5
2.00
12
2.6
4.3
3S
34
12
4.3
16
28
5.66
2.00
0625
3.6
0915
0925
3
6
92
34
4
6
92
99
3
13
15
4.2
3.9
16
13
57
65
0.1
0.2
1.00
1.00
2.00
8
4.7
96
1015
7.9
3.6
102
1016
7.9
3.5
4.1
96
97
61
4.1
17
30
16.4
2.00
97
31
4
4
12
3.5
11
4.8
50
24
4.2
100
26
4
12
5
55
25
2.2
0
5.00
1025
1210
1310
2.1
7.9
7.6
7.9
70
3.00
5.00
URN
"
'
NAME
---------
" "
DATE
TIM E
DEPTH
~ F F T T E M F G F D IS S O IV D
m
29/02/96
26/04/96
22/05/96
24/06/96
1411
7.8
1510
1610
1710
1610
1910
1915
2010
7.8
7.8
7.8
7.6
7.9
8
8
8
7,6
»
7.7
7.7
7.7
0640
1305
1025
1445
0030
0031
1230
4.4
4.2
4.3
4.3
• 4.2
4.4
4.5
5.5
5.5
3.5
6.1
11.2
12
OXYGEN
% SAT
96
98
98
101
102
100
100
99
100
95
104
94
94
TON
AMMONIA NITRATE “ N IT R IT E
'S U S P E N D ' “ O R T H t r ‘ S A L IN IT Y FILTERED FILTERED FILTERED FILTERED SOLIDS PHOSPHT
PPT
mq/l
gq/l filtered
mq/l
mq/l
uq/1
Mfl/I
29
29
29
30
45
29
32
96
102
14
15
17
20
4
4
4
4
4
4
4
2
2
5
5
4
4
8.7
8.7
8.7
17.4
17.6
17.5
144
152
93
64
150
20
8.8
8.9
8.8
17.1
17.7
17.7
157
154
0
1
159
1530
1630
1730
9
8.9
9
9
17.6
17.6
17.8
142
142
136
1
1
1
2
129
2
1630
0.9
16,7
16
116
1635
1930
2030
2130
9
8.8
17.5
17.2
17
16.6
16.6
115
114
110
108
103
2230
2330
29/07/96
1.8
4.3
2015
0800
1330
1232
1235
1330
1340
1430
-
WATER
DEGC
2.1
2
1.5
8.4
8.2
6.2
30
44
53
1
12
13
13
13
13
14
14
8
8
11
11
14
14
4.9
5
5
5
5
5
4.8
2.2
48
49
33
24
18
119
121
40
2.3
5.5
5.5
4.7
4.7
1.3
1.2
0.96
36
42
42
40
37
-
36
19
26
28
0
0
90
0.1
0.1
58
69
57
33
43
11.6
14.9
3.7
0.96
38
26
15.4
39
66
39
24
56
54
59
64
34
1.8
1.7
1.9
2
2.2
2
32
31
2.3
2.4
13
82
102
116
1.8
5.2
1.5
3.1
0.6
2
35
2.3
2
2
2
2
32
29
29
33
2.4
2.5
2.5
2.4
1
0
37
34
36
•
0.1
0.1
0.1
0.1
0.1
22
3
4
23
23
22
24
27
27
29
35
36
22
23
11
9
5
4
5
111
127
138
142
144
.............
20/09/96
1800
0710
1230
12/11/96
1250
1630
300
3.00
3 00
2.00
2.00
3.00
3 00
3.00
1.00
1.00
1.00
7.00
6.00
14.00
13.00
79.00
221.00
119.00
185.00
189 00
209.00
198.00
378.00
155.00
86.00
157.00
104.00
0.4
0.3
0.3
0.3
107.00
78.00
111.00
38.00
28.00
0.5
1735
1215
PHYLL A
pq/l
0
0
1405
13/08/96
CHCORO
31.00
88.00
39.00
96.00
67.00
15.00
94.00
7.6
7.9
6
8.4
91
35
6
90
106
4
12
14
6.4
18
26
0.1
4.7
55
35
8.8
3.00
6.00
TAW ESTUARY - BARNSTAPLE
STD
MEAN
MAX
MIN
No of Samples
Nos exceeding DOE criteria
pH
Temp
D.O.%
Ammonia
Nitrate
Nitrite
TON
S Solids
Ortho-phos
Salinity
Chloropyhl A
0.46
8.15
9
7.5
108
7.092051
12.08116
24.4
1.8
124
23.32263
109.6232
171
84
120
33.37212
50.21569
179
13
87
1.727619
2.028986
6
0
86
10.22932
18.98361
42
8
78
1.771744
2.897377
6.4
0.15
100
29.17879
37.38806
121
3
106
31.90004
42.50725
144
19
107
11.82411
9.894769
33.4
0
120
!
75.04513981
63.84269663
378
1
126
68
" D A T E ' “ T I M E ” 'D E P T H ' - PFr
m
U R N ------------- N A M E ' ‘
E3QA7
TAW ESTUARY . ASHFORD STW
13/01/94
22/02/94
28/02/94
14/03/94
29/04/94
31/05/94
16/0694
'
0915
0745
0746
0900
0901
1435
1436
1545
1546
1547
1546
1255
1045
1050
1355
0859
0900
1040
1041
1042
0931
1110
1111
1620
1621
1700
1701
1702
1703
1150
1120
9
8.8
1
1.4
9
9
5
5
6.4
6.4
8.5
8.5
6.4
6.3
6.3
96
96
91
91
91
147
2.5
257
2.5
852
2.1
1.8
226
1.8
223
16.6
16.6
t6.4
16.4
16.4
168
168
164
164
164
19.1
19
192
195
19.2
178
19.2
178
PHYLLA
p q /l
8.00
10.00
0
83
108
79
106
634
55
0.1
02
900
54
02
0.2
2.6
8.00
28
21.7
21.7
27.8
27.6
27.6
17.4
213
29
57
35
106
0.33
65
7.00
163
91
6.3
CHCORO“
41000
175.00
420.00
18
0.77
38
10
12
12
183.00
89
7.7
12.1
12.1
13,2
82
82
74
74
7.9
13.2
13.5
13.5
8
13.8
89
88
88
13.9
88
13.8
13.8
88
88
1
7.1
0.7
1.1
1
2
2.5
8
816
1.3
64
31
200
13.7
13.7
11.00
6409
12
80
1491
14.00
262
1.5
73
72
6.7
6.7
9.9
10.1
136
0.89
96
46
18.7
9.00
44
22
25.4
25.4
13.00
38
03
5.00
41
0.3
07
3.00
0.79
116
51
18.00
43
0826
1158
0.6
1159
1255
1
8
10.8
90
90
7.9
10.0
10.9
10.9
95
97
62
3.3
75
3.4
21
44
43
0.7
26
98
0910
0845
7.9
8
112
62
3
11
8
100
18
97
47
102
80
0
3
1
5
7.7
8
9.3
9.4
6.3
8
7.6
1130
7.7
6.2
98
90
26
89
1130
7.7
5.5
84
135
2
3
1330
0645
0646
S U S P E N D ' “ O R T H O ~ -S A tlN lT r
PHOSPHT
S O L ID S
PPT
m q /l
p q /l filte re d
113
44
0.8
165
08
144
69
0
133
0825
0846
09/03/95
8
0.5
0.6
0930
02/03/95
6.1
1
2
2.6
1646
04/10/94
03/02/95
7.6
1
1.1
1300
1230
1000
22/12/94
29/12/94
7.1
0.6
1430
1431
1645
26/07/94
10/00/94
16/09/94
07/11/94
09/12/94
12/12/94
7.9
1
'T E M P " O T " “O X Y G E N * T ffiA M O N T A - “ N I T R A T E ' “ N I T R IT E - — T O N
W ATER
D I S S O L V F IL T E R E D F IL T E R E D F I L T E R E D F IL T E R E D
m q /l
m a /l
Deq C
% Sat
u q /l
u q /l
3.2
3.2
0.77
17
34
29
26
36
206
1.00
2 00
12
17
3.8
41
25
0.5
200
1.8
35
7
2
22
22
0.64
2.7
28
24
34
9
32.9
6.79
3 00
0
23
39
65
16
43
0 2
3 00
2 00
500
U R N ""
N A M E .........................
DATE- ~ T (M E ~ DEPTFT ~ p f r T E M P T > r “ OXYGEN” "AMMONIA" "NITRATE- “ NITRITE- — TON— SUSPEND" “ ORTHO” ~5A0NI7Y"
PHOSPHT
S O L ID S
m
D I S S O L V F I L T E R E D F I L T E R E D F IL T E R E D F I L T E R E D
WATER
PPT
gq/1 filte re d
m q /l
m Q /l
m q /l
. Deq C
% Sat
n q /l
24 /0 4 /9 5
16/05/95
21 /0 6 /9 5
13/07/95
10/08/95
1132
1615
09 30
1605
09 15
1540
07 50
1355
08 30
1255
0700
2
7.8
7.7
5.5
6.9
60
96
123
58
2
3
22
19
2.7
3.3
15
17
40
26
0.2
0
6.1
8 .7
10.4
12.5
97
135
91
0
1
11
27
0.36
1.3
15
47
36
17
27.4
5
0.12
14
47
15
23
34.3
26.1
6.2
18.1
100
0
1010
1130
1455
06 45
1450
0730
1250
07 30
1245
8.2
20
106
0
7.7
7.8
6.5
6.5
69
65
59
3
234
7.3
7.9
4.5
5.1
91
92
2 2 /0 2 /9 6
07 40
1345
07 55
6
8
7.9
7 .6
5.6
6
5.4
29 /0 2 /9 6
08 00
1455
08 20
3.8
93
93
100
94
7 .9
7.8
6
5.7
10.7
11.3
96
98
87
6.5
16.9
133
9 .2
18.6
154
17 /0 8/9 5
04 /1 0 /9 5
0 1 /1 1 /9 5
17 /1 1/9 5
14 /0 2/9 6
1420
26 /0 4 /9 6
22 /0 5 /9 6
24 /0 6 /9 6
06 55
1240
1010
1420
1315
1316
1830
10,8
CHITORO
PHYLLA
UQ/l
3.00
3 00
21.00
31.00
1600
154.00
156.00
74.00
26 .0 0
90 .0 0
31 .0 0
17.00
11.00
5.00
3.00
6.00
4.1
6
62
81
0.4
3 7
30
32
27
0.1
0 .4
2 9 .5
34
3
22
27
3.9
3.7
14
72
75
5
5
20
15
5.4
5.6
13
14
42
33
54
0
0
4
0.87
0.71
50
131
38
5
5
20
19
44
7
14
26
27
27
43
97
4.5
36
31
44
69
16
4.9
5.5
5.3
4
16
12
29
17
0
15
0.45
25
40
24
2
50
2.1
25
29
4 .2
4
4.6
0.1
0.1
0.4
0 .4
0.4
2.00
2.00
1.00
1.00
3.00
2.00
1.00
5.00
500
10.00
14.00
21.00
1631
1350
1720
326.00
131.00
13 /0 8/9 6
1235
1615
90.00
20 /0 9 /9 6
07 25
40.00
29 /0 7 /9 6
79.00
52.00
1135
12/11/96
1315
1720
7.9
7.9
8.7
91
83
6
24
6.2
116
31
1
42.00
1500
8
90
231
4
16
4.9
63
35
7.1
800
TAW ESTUARY - ASHFORD ST\
STD
MEAN
MAX
MIN
No of Samples
Nos exceeding DOE criteria
pH
Temp
D.O.%
Ammonia
Nitrate
Nitrite
TON
S Solids
Ortho-phos
Salinity
Chloropyhl A
0.44
8.03
9.2
7.1
42
4.649843
11.02982
20
3.8
57
33.03206
108.4717
195
74
53
1059.521
322.2857
6409
18
35
1.914965
2.392857
6
0
28
9.098923
18.36
50
5
25
1.777983
2.597436
6.2
0.12
39
89.03911
60.13462
634
7
52
228.7003
79.5
1491
10
40
11.48006
11.27482
34.3
0
56
91.4154125
48.3448276
420
1
58
29
URN"'
NAME
E30A8
TAW ESTUARY - RAF CMIVENOR
'SUSPEND* '~(3RTHO“ l "SAUNiTY"
TOR
DATE- “ TIME- 'DEPTH' ~PH~ TEMP’ O 'r "OXYGEFT TtfAMtfRIA' "NITRATE" “NITRITEm
DISSOLV FILTERED FILTERED FILTERED FILTERED SOLIDS PHOSPHT
WATER
PPT
pq/l filtered
mq/l
mq/l
Deq C
% Sal
Mq/l _ _ mq/l N
Jjq/1
22/02/94
16/06/94
0720
0721
0722
0723
0949
0946
0947
1343
1346
1347
1346
1349
1615
1616
' 1617
1610
1619
0635
0636
0637
0640
1055
1056
04/10/94
7.9
1
2
2.9
1
1.4
7.9
1
1.6
2
3.2
1
2.2
3
4.4
1
2
2.5
7.9
7.9
B
6
6
6.4
B.4
6.2
1
1057
1.75
6.2
1056
1059
1100
1500
2
3
3.5
6.2
1502
1505
1630
1
1.4
1635
0945
0946
0.6
0947
1.3
6.S
9
6
1
1130
1131
7.9
0.7
1543
13/12/94
7.9
7.7
6
1546
1547
1
2
1546
2.3
1730
1731
1
1732
1733
2
2.5
1734
3
1735
4
1736
5
0832
0633
1147
1.1
1146
1
1149
2
2.9
14.6
14.6
14.6
14.6
17.7
17.7
17.7
18.4
95
95
95
95
96
96
96
2.6
152
44
0.8
0.9
0.9
1
149
170
2.5
2.5
166
44
150
48
167
2.2
62
47
160
2.3
85
47
167
50
2.3
0.75
109
28
47
30
29
0.43
47
27
40
0.43
29
36
27
13
25
13
12
13
6
13
0.11
4
23
13
13
0.1
50
10
134
0.85
41
48
155
0.99
56
53
46
0.4
30
30
110
110
106
108
202
204
204
16.4
12.9
12.9
65
66
12.9
66
12.6
12.6
14.3
14.4
87
85
91
92
14.4
92
14.4
92
6
14.6
94
83
93
6
14.8
14.8
14.6
14.8
92
14.6
92
14.6
92
6
10.6
95
10.6
95
10.6
10.6
91
10.7
90
10.7
91
91
0.2
0.3
0.3
3.2
3.7
4
4.2
4.6
26.9
29.9
31.1
31.1
31.1
30.8
30.9
31.3
31.6
33.9
34.2
34.4
34.4
34.6
34.6
27.9
28
28
25.2
25.2
12.6
21.6
21.6
19.2
> 19.9
7.7
24.00
8.00
10.00
3.00
5.00
7.00
1.00
2.00
2.00
30.00
31.00
10.00
6.00
6.00
111.00
1.00
12.00
15.00
7,00
30,7
.
50
0.43
33
31
0.15
15
21
0.15
15
20
30.9
30.9
32.8
33
7.00
2.00
33.2
93
6
7.9
148
126
127
125
123
112
110
6
7.9
11S0
5.1
5.1
5.1
5.1
5.2
5.2
5.2
5.9
5.8
5.6
5.6
5.B
6.9
7.1
7.1
7.1
7.1
15.6
15.6'
15.7
15.6
15.2
14.9
CHLT5RO" _
PHYLLA
PQ/I
33.2
2 00
; 33,1
. 33 2
17
20
56
0.15
3.3
46
39
79
3.3
44
41
33.2
2 00
, 03
0.4
3.00
0.4
4.00
07
0.3
85
3.2
62
42
09
5 00
O R N -------------- N A M E ----------------------------------------- " D A T E ” " T I M E -
03/02/95
02/03/95
03/03/95
22
8
8
8
8
7.9
115
113
102
110
105
98
98
90
70
69
79
0
0
2
0
0
i
1
1
8
7.9
8
7.9
8
7.9
6.9
5.8
6.7
5.7
6
5.7
32
101
57
0
1
1
91
77
7.9
7.8
7.8
7.8
5.7
5.9
5.9
6
6
6.1
6
91
84
88
83
83
82
77
68
62
83
104
97
1
1
2
2
108
119
79
2
2
2
81
87
88
76
2
2
86
82
2
6.2
6.1
6.1
6.4
85
81
78
87
79
104
91
2
2
2
1
7.9
8
8
8
8
6.4
6.4
6.4
84
86
60
62
1
1
1
74
38
1
0
1015
1515
0923
8.1
10.4
97
11
0
1445
8.4
11.8
112
1402
1500
1502
1600
1602
1700
1800
1900
2000
2005
2100 .
1S/05/95
21/06/95
13/07/95
P H " " T E M F O r " O X Y O E N " ■ A M M O N IA - " N IT R A T E " " N I T R I T E ”
D IS S O L V F I L T E R E D F IL T E R E D F I L T E R E D
W ATER
m q /l N
D eq C
% Sat
u q /l
8.9
8.7
8.5
7.4
7.7
6.6
6.6
6.1
0825
0827
1310
0710
0711
1155
1200
1100
1102
1200
1202
1300
1302
1400
24/04/95
DEPTH'
m
4.3
6
1.6
4.8
4
3.3
2.5
2
1.6
8
8
7.9
7.8
7.8
7.8
7.8
2.6
2105
2200
3,5
2205
2300
*2305
3.8
3.8
7.8
7.8
7.9
53
22
24
106
0
TON
■ S U S P E N D ' “O R T H O " 'S A L I N I T Y "
PHOSPHT
F IL T E R E D
S O L ID S
PPT
p q /l filte re d
m q /l
m q /l
5
1
0.26
10
5
5
16
17
14
2.8
0.5
0.46
1.7
1.7
1.5
7
18
10
17
12
19
18
0.69
2
1.1
2
1.4
2.4
2.4
2.7
2.7
2.7
2.8
2.8
15
8
17
11
21
21
21
21
21
21
59
89
49
84
109
82
14
18
40
18
28
29
27
26
34.7
13.5
14
14.1
27.9
7.3
34
28
33
24.2
7.5
14.9
4.1
4.4
0.2
0.2
0.2
0.2
0.2
30
35
34
36
41
33
33
26
31
21
20
20
2.7
19
32
2.8
2.6
24
20
2.5
22
32
36
36
16
1.9
15
11
11
1.8
1.2
8
22
7
23
30.5
34
7.8
34.4
25
21
27
23
23
34
34
31
27
0.3
0.5
5
5.3
10.6
13.9
32
31
3.00
3.00
3.00
3.00
4.00
2.00
2.00
7
13
65
14
13
6
14
0.19
0.66
•
10.7
22
35.00
13.00
MOO
193.00
4.00
500
47.00
18
18
102
102
0
8
14
0
98
99
0
4.2
18.2
18
17
14
0728
0825
8.2
8.2
7
16
0
29
8.2
18.2
99
0
0828
3.3
82
18.1
100
0
23
37
15
14
8.2
18.4
0
53
8.2
18.4
102
101
0
35
8.2
18.6
104
20
8.2
8.4
19.1
21.2
109
0
0
0
8.4
0725
0925
1230
1330
4.00
3.00
2.00
2.00
1.00
30.00
13
7
8.2
8.2
1125
2.00
300
5.00
4.00
2.00
1.00
2 00
2.00
2.00
2.00
3.00
3.00
4.00
4.00
2.00
4.5
0928
1025
1.00
2.00
4.00
28
29
26
7
0845
1410
0835
0625
0628
p h y il a
28
1.2
1.6
0.83
1420
10/08/95
C H L 'O R O
2
144
138
34.4
34.5
4.00
4 00
33.9
12.00
34.3
34.3
12.00
13.00
15
34.4
12.00
16
34.2
11,00
16
17
34.2
34
14.00
11.00
27
10
33.8
10.00
88
27
33.2
49.00
54.00
142
0
0
38
153
31.9
8.5
21
21.8
16
1430
15
31.7
1530
8.4
22.8
149
0
63
19
32.1
05 00
41.00
'
ORN
NAME----------------------------- "D A T E * “ TIME” "DEPTH" “ P H " ~TEMP"OF" "OXYGEN- "AMMONIA" 'N ITR A TE * ^NITRITE” — TON— SUSPEND' “ ORTHO"' " S A G N ir r
m
DISSOLV FILTERED FILTERED FILTERED FILTERED SOLIDS PHOSPHT
WATER
PPT
mq/l N
mq/l
uq/l filtered
mq/l
Deq C
% Sat
uq/l
uq/l
1530
1535
1630
1635
1730
1830
1930
2030
23/06/96
29/07/96
13/08/96
.............
20/09/96
12/11/96
2035
2130
2135
2230
2235
2330
2335
0030
0035
1330
1700
1310
1835
0740
1150
1345
1730
2.8
2.3
2.2
3.2
4
4.8
5.5
8.5
8.5
86
8.5
8.7
8.9
8.9
8.7
86
8.6
8.4
8.3
8.3
8.3
8.3
8.2
8.2
0
8
17.2
17.1
17.9
17.8
18.6
18.8
18.7
18.3
18.4
18
17.6
16.9
16.9
16
15.9
15.3
14.6
8.5
11.5
136
133
150
140
173
198
175
157
150
132
123
122
113
111
109
110
95
94
31
20
17
23
22
18
20
17
14
81
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
4
0
15
14
0.43
0.41
19
18
24
30
30
23
20
20
12
6
6
0.52
0.5
0.59
0.82
0.77
0.61
0.54
0.51
6
22
13
24
28
33
26
17
14
0.38
0.19
8
5
11
0.17
0.11
7
3
28
26
28
31
28
26
22
25
25
27
19
11
12
10
0.1
17
4.9
0.36
85
83
34
22
24 8
25
22.6
23.9
20.5
17.1
17
19.1
21.7
21.2
25.1
29
29
31.9
32.2
33.6
33.8
6.7
33.7
CHCORO
PHYLLA
uq/l
16.00
16.00
18.00
19.00
31.00
16500
73.00
142.00
25.00
23 00
15.00
10.00
10.00
4.00
4.00
2.00
2.00
105 00
3.00
191.00
4.00
18.00
300
10.00
5.00
TAW ESTUARY - RAF CHIVENOI *
STD
MEAN
MAX
MIN
No of Samples
Nos exceeding DOE criteria
pH
Temp
D.O.%
Ammonia
Nitrate
Nitrite
TON
S Solids
Ortho-phos
Salinity
Chloropyhll A
0.23
8.2
8.9
7.8
133
5.917307
13.096
22.8
4.1
159
22.97471
109.973
198
89
144
39.09571
49.775
145
10
86
1.179529
0.573333
5
0
107
6.663177
13.88235
30
6
65
1.476704
1.293462
5.7
0.1
105
25.26038
29.64286
153
3
127
10.26272
23.92857
70
10
128
9.677498
26.61733
34.8
0.6
157
35.68112921
19.34939759
191
1
145
43
TAW ESTUARY
RIVER CAEN AT VELATOR BRIDGE
pH
Temp
D.O.%
0.16
7.74
0.1
7.4
3.320226
11.16406
17.6
3.4
5.86590
99.00333
115
02
Ammonia Amon(non i)
Nitrate
Nitrite
TIN
TON
S.Solids
2.431663
2.241667
0.0
0
0.022431
0.014722
0.1
0
0.0635
5.0625
6.9
3.6
0.0194
4.9444
6.9
3.6
23.46977
13.05556
141
0
Ortho phos, Silicate
hloropyhl
No of Samples
STD
MEAN
MAX
MIN
0.050265
0.021111
0.27
0
0.000663
0.000501
0.0041
0.0002
0.061621 ; 0.637762
0.040270 ! 4.651515
1 5.0
0.23
3.1
0
9.123003
5.72
49
2
TAW ESTUARY
IURN
u m
DEPTfo
PM
m
R30A004
■
nvEn v i w at
taw ton
..........
'
■
TEMP o r
OXYGEN AMMONIA
W ATER
D eqC
D IS S O L V
% Sat
m q/l N
T O tJ flE T
n o n Io n is e d
m art
ma/J N
m q /l N
m q/l
m q /l N
SUSPEND
S O L ID S P H O S P H T
m q /l ‘
ma/J
100104
1325
7.0
0.0
100
0.00
0.0003
3.4
0.019
3.5
22
0.04
110294
1153
7.7
90
0.10
0.0013
2
0.045
2.1
1135
0.0000
0.1
<0 02
<0 02
<0.02
0.02
0.05
0.15
0.03
0.03
0.001
0.0003
0.0005
0.0003
0.0003
0.0007
0.0013
0.0002
0.0003
30
3.1
2.3
1.9
1.5
1.2
1.0
2
3.4
3.0
0.017
0.032
0.017
0.02
0.008
0.02
0.031
0.025
0.012
0.01
3.7
1223
1503
1140
1303
1020
1120
1433
1D43
1145
101
100
90
104
112
97
84
90
90
94
0.00
310304
275404
140604
50704
190894
90994
231094
151194
141294
7.#
7.8
7.9
a
8
7.0
7.6
7.7
7.0
7.7
2.4
2
1.0
1.3
1.7
2.1
3.5
3.7
SO
14
23
11
3
3
13
59
40
12
6
0.07
10394
8
7.5
6.4
12.2
13.9
15.1
14.9
12.8
11
11.0
9.1
300193
220295
160393
30395
120093
00793
30893
110993
200993
231085
71195
271195
1135
1243
1120
1055
1255
1130
1200
1800
1035
1110
1430
1210
7.5
7.5
7.0
8
8
7.9
7.9
7.7
7.7
7.3
7.7
7.0
8.1
8.0
0.9
12.7
12.7
10.3
19.8
15
11J
11J
7.0
97
99
101
107
103
100
90
89
104
104
95
94
0.04
<0.03
0.12
<0.03
0.03
<0.03
<0.09
<0.03
<0.03
0.10
<0.03
0.21
0.0002
0.0002
0.0007
0.0007
0.0008
0.0008
0.001
0.0005
0.0003
0.0008
0.0003
0.0010
4.1
3.8
3.1
2
T.9
12
1
1.7
2.3
4.3
2.0
4.1
0.012
0.011
0.017
0.018
0.028
0.000
0.007
0.000
0.017
0.070
0.01
0.029
4J2
3.9
3.3
Z1
2
1.3
1.1
1.8
2.0
4.7
2.7
4.4
4.2
3.9
32
2.1
2
1.3
1.1
1.0
2.0
4.0
2.7
42
23
13
27
7
3
5
0
14
5
44
3
14
0.04
0.03
<0.02
<0.02
0.04
0.02
0.04
0.07
0.05
0.08
0.03
60190
230190
220290
270390
90490
290390
190090
40790
100790
too 00
240996
211090
1050
1210
1143
1125
1115
1140
1330
1020
1100
1300
1355
1313
7.0
7.7
7.7
7.8
7.8
7.8
8.8
0
97
105
100
103
103
90
0.08
0.04
0.13
<0.03
0.03
<0,03
0.0000
4.0
4.3
0.025
0.013
0.025
0.011
0.024
0.023
4.0
4.9
4.0
4.5
4.6
3.9
4
38
0
0.04
0.02
0.03
<0.02
0.03
95
90
<0.03
0 05
0.04
1.9
1.0
1.3
1.1
0.00
0.0000.
1*1ISO
1123
0.17
0.0012
2.2
4
0,019
0.02
0.01
<0,004
0.038
2
1.7
1,4 .
<0.03
0.0003
0.001
0.0009
0.0007
7.8
7.8
7.9
S
7.0
7.0
92
3.4
5.1
8.0
12.7
17.3
13.7
11.0
10.5
13.2
12.8
7.0
OS
99
95
00
0.0003
0.0008
0.0003
0.0003
0.0005
4.4
4.7
3.8
3.9
0.024
3.4
4.0
4.0
4.8
3.9
4
1.1
2
1.7
1.4
1.1
2.3
4.2
2.3
4.1
to
4
. 1
17
25
3
0
<3
<3
11
03
TfiC S R O '
m q /I
PHYLLA
PQ/1
5.4
4
0.02
0,05
0.03
. 002
<0.02
0.05
0.08
0.00
0.03
0.03
50
3.2
3.1
3.0
3.4
5.0
0.6
0.3
5.9
62
2.00
2.00
0.00
2.8
0.3
0.0
0.9
7.3
7.7
0.8
7.3
0.1
0.00
6.03
S IL IC A T E
3.9
0.4
5.8
3.0
5
5.7
i
9.00
5.00
0.00
0.00
0.00
4.00
17.00
1.00
4.00
0.00
1.00
2.00
4.00
0.00
11.00
0.00
0.03
0.04
0.04
0.02
0.4
0.04
0.02
7.5
5.00
5.00
3.00
2.00
0.00
5.0
7.00
0.4
6.S
0.0
RIVER VENN AT BISHOPS TAWTON
pH
Temp
D.O.%
Ammonia
mon(non i)
Nitrate
Nitrite
1.186586
2.791667
4.8
1
0.013144
0.020694
0.076
0
TIN
TON
S.Solids
Orlho phos
. Silicate
Chloropyhl A
No of Samples
STD
MEAN
MAX
MIN
4
0.163.57358 5.362478
7.75
11.10811
98.27778
8
19.8
112
7.3
5.1
84
0.059393
0.050556
0.21
0
0.000362
0.000642
0.0016
0.0002
1.3174
3.0667
4.9
1.1
1.1907
2.8889
4.9
1.1
17.04811
17.52778
63
0
0.0204728 '1.053369
0.0355556 ;5.963636
0.08 ‘
7.7
0
2.8
3.392698
5.36
17
1
TAW ESTUARY
l)RW'“
flAME
bATg”
TIME
m
R30ADM
(HOWLWATERAT OLfi
ftMUMWBl«001 VttATO*'
V
“ i s r rT E ftP 6 F
WATER
Dog c
0
7.7
8.1
7.8
7.7
8.3
7.0
10.3
10.4
8
13
8
8
17.2
7.7
14.9
' 10.9
7.0
7.0
0.8
7.8
10.7
0.9
7.8
10/Q1/M
04/02/94
10/02/94
24/OVW
20/04/M
29/09/94
01/07/04
07/08/04
101004
20/10/94
17/11/94
10/12/04
1420
1110
1040
1410
1390
1040
1230
1119
1009
1019
1099
1240
23/01/99
23/OS/M
zz/os/ m
26/04/M
29/09/09
12/08/09
00/07/09
28/07/09
23/08/09
19/00/M
04/10/09
02/11/M
10/11/M
0839
1030
0M8
1120
t093
1000
1140
1000
1110
1298
1030
1040
11M
7.7
7.7
7.#
8.1
i i/o t/m
20/01/SO
20/02/M
21/03/M
12/04/M
14/09/M
12/M/M
31/07/80
20/08/M
11/08/M
io/ io/ m
08/11/M
0920
1429
1109
1049
1949
1140
1420
1020
1440
1099
1200
0030
O kV cE N
DISSOLV
% Sal
07
AMMONIA AM M 6W K
M
09
102
1t9
08
89
09
too
99
03
N lTriiTE
mofl N
mq/l N
0.0000
0.0003
O.OOM
0.0007
0.0004
0.0007
0.0009
0.0007
0.0003
0.0003
0.0004
0.0002
0.3
0
9.8
9.9
9.7
4.7
9
3.1
9
4.2
9.4
9.8
0.031
0.077
0.041
0.033
0.011
0.033
0.029
0.034
0.019
0.0(0
0.013
0.033
0.04
0.04
<0.03
<0.03
0.0003
0.0003
0.0003
0.0007
0
0.1
9.7
4.8
0.029
0.027
0.019
0.023
mg/I N
0.07
0.03
0.07
0.09
<0.02
0.03
0.03
0.09
<0.02
0.02
0.03
<0.02
too
n it r a t e t
non lonbed
_ mg/l
r T lH ~ “ T O T
SOLIDS
PHOSPHT
mcj/l N
mq/l
mq/l
mq/l
0.4
0.1
9.9
9.0
9.8
4.8
9.1
3.2
9.1
4.3
9.9
0.9
29
17
23
24
7
7
4
13
n
4
19
10
0.03
0.09
0.00
0.00
<0.02
0.08
0.12 '
0.2
0.1
0.1
0.04
0.03
9.4
9.9
9.3
4.9
9.9
90
4.9
9.4
0
0.4
9.4
9.9
0.1
02
9.8
4.9
0.1
0.2
9.8
4.9
38
21
3
8
0.09
0.09
004
O.M
4.0
9
9
77
12
7
13
21
10
0.17
0.18
02
0.29
0.23
0.27
0.17
0.14
0.7
0.3
92
9.4
0.7
0.0
72
0.7
30
27
10
9
311
3
'10
0
10
12
13
31
0.09
0.09
0.07
0.08
022
0.07
0.1.
O.M
0.27
0.21
024
0.00
9.3
9.8
9.t
4.9
3.9
4.7
0.1
0.4
0.0
9.7
0.0
9.7
mq/l
1 toi
100
103
107.
7.0
8.4
7.9
7.7
7.0
7.7
7.8
7.7
7.8
7.8
92
10.8
14
12.2
te j
17
17.2
13.0
14.3
M
10.3
M
129
02
97
102
M
04
89
0.08
0.04
020
0.24
0.04
0.07
<0.03
0.08
0.0019
0.0029
0.0029
0.0038
0.0009
0.0009
0.0004
0.0008
4.9
3.9
3.3
3.2
3.4
3.9
4.1
4
0.039
0.030
0.091
0.M1
0.029
0.034
0.012
0.033
4.0
4
3.0
3.9
3.9
3.0
4.2
4.1
4.0
4
3.4
3.3
3.9
3j0
42
4.1
7.0
7.8
7.7
7.8
7J>
8.1
8
7.7
7.0
8.4
7.8
7.7
8.8
2J
0.3
6.8
8.8
0.7
13.0
18.4
13
14.0
104
8.8
00
08
07
00
M
104
04
M
83
122
97
92
0.04
0.03
0.09
0.07
0.48
<0.03
0.00
0.08
0.M
0.03
0.00
0,04
0.0003
0.0002
0.0004
0.0000
0.0029
0.0007
0.0007
0.0013
0.0011
0.0021
0.0008
0.0003
7A
0.9
0.3
8.4
3.0
9.0
0.0
42
3.7
3.0
3.4
8.7
0.029
0.02
0.032
0.031 .
0.002
0.020
0.029
0.019
0.042
0.010
0.028
0.027
7.7
0.0
0.4
0.9
4.1
9.7
9.7
4.3
3.8
3.7
3.0
8.8
7.7
0.0'
0.4
9.9
3.7
9.7 •
0.7
4.3
3.8
3.7
3.9
8.8
-
fiH L O R ft
PHYLLA
no/i
9.00
4.00
1.00
19.00
8.00
11.00
(9.00
too
9.00
4.00
7.00
4.00
(3.00
0.00
4.00
197.00
7.00
83.00
9.00
0.00
0.00
11.00
7.00
8.00
7.00
pH
KNOW L WATER AT OLD
Temp
D.O.%
Ammonia
mon(noni)
Nitrate
Nitrite
TIN
TON
S.Solids
Ortho phos
Silicate
Chloropyhl A
RAILWAY BRIDGE. VELATOR
No of Samples
STD
MEAN
MAX
MIN
0.2 3.441665
7.994742
7.8411.03784 98.97222
8.4
17.2
125
7.5
2.7
85
I
0.089135
0.062222
0.48
0
0.000878
0.000922
0.0038
0.0002
1.2933830.014725 1.4214
4.977778 0.030222 4.9958
8.7
0.092
8.8
3.1
0.011
3.5
1.2934
5.0778
8.8
3.2
49.49656
23.08333
311
3
0.0776745
0.12
0.27
0
0.754965
5.581818
7.2
3.5
32.471625
16.56
157
1
TAW ESTUARY
M
AT n e w
No of Samples
RIVER t a w
STD
MEAN
MAX
MIN
i
BRIDGE
pH
0.21
7.74
8.3
7.4
Temp
D.0.%
4.873489 5.425349
11.81351 07.19444
22.3
107
4
80
Ammonia mon(non I)
0.115286
0.050167
0.7
0
0.00083
0.000781
0.0044
0.0001
Nitrate
Nitrite
1.286564 0.011332
2.644444 0.024417
6.2
0.067
1
0.006
TIN
TON S.Sotids
1.4157 1.2866 54.31705
3.0083 2.7444 27.36111
6.36.3
271
1.11.1
0
Ortho phos
Silicate
0.0955503
0.1141667
0.35
0.03
1.811736
3.893939
Chloropyhl A
16.211107
11
6.370
00
UVSW
TO•PHVTOPLANKTONFROMTAWESTUARINESITES-1995
EjOAS-LHlla PHI
25lh Apn
10th May
LW
HW
LW
HW
TSjcotT
21it Jun >
LW
HW
13th July
LW
HW
17th August
LW
HW
E30A6 • Bamsteph
25lh April
116th May
LW
HW
LW
HW
4th Ociobw
LW
HW
21st Juna
LW " HW
13th July
HW
LW
17th August
HW
E30A7 • Off Ashfo
25th April
lW
HW
4th Oclobar
HW
LW
Phyioplanlctoo
*
Baelllartopfiycaaa (Diatoma)
C artrtc diatom M a t.
A*!tficnmll»'
■
■
C ocdnodkcuj
Dliydim
-
Ttaudirta
•
•
-
taptocyf/mJrtcu* ■
Ms Jo* fro '
Navtcutold
N tu tc N o d
Ptouroalgmotd
R h lzo to M *
St9ph*nodl»cu»
rtmittttormrm
Thabulouln
400
100
-
*
B W u lp m
Cho*toc*m* *
*
3 000
400
160
40
•
60
■
i ooa
300
2 OOC
100
100
100
.
.
.
2 300
200
-
450
300
1 700
000
200
400
-
60
100
60
.
150
*
.
-
12 ooa
100
*
3 0OG
400
200
-
000
.
too
0600
100
400
737
1 oot
07
2 200
700
400
1 3SC
.
280
1 02 E
825
03
4 000
too
"
•
2 OOC
1 IOC
200
*
300
260
250
250
7 OOC 13 OOC 12 IOC » 200
BO
1 1«
900
■
BOO
200
100
*
S00
600
400
•
500
100
007
333
200
200
350
250
•
•
BOO
4 70C
100
0 200
100
100
*
760
250
1 660
BO
•
60
*
-
•
100
3 300
.
200
2 ISO
60
2 OOC
1 200
100
-
1 40C
.
000
700
400
-
-
-
*
*
000
600
•
-
.
.
.
-
100
.
.
-
.
.
.
■
200
700
390
250
900
•
150
150
-
•
.
*
100
50
-
.
.
*
400
1 IOC
•
11 TOC 10 200
737
07
1 JOC
2 86C
300
*
-
50
-
-
100
250C
188
07
07
100
•
100
1 250
50
-
-
300
650
03
260
60
250
1 060
O inop hycM * (Dlnoflagallalaa)
Dtnoflagatlat* (noat.
*p ct. Gianodinlum
BO
•
*
■
Kutodlnlvm
Gywnxtlnlum
Oymdlnlum
Pctykrlko* •
Pmtoptikttnlum
»
*
*
•
100
k
•
*
•
1 BOO
*
*
200
600
1 400
60
160
60
2260
60
.
.
.
050
3250
»
.
*
-
100
„
.
1 00«
402
60
_
_
.
#
_
400
*
_
.
260
*
m
100
-
-
•
-
200
03
■
•
■
■
6360
1 008
Othar F iagaflatm
Fl«g«ttata M a t.
S ca oadum ua
ooo
1 360
T stm trvm '
?MalJomonas
tftogfana
E uglanopfycaaa
BOO
200
Chiytochmmutln*
Prymnasloptiycaaa (Haptophyea
0uctttalortm
4 JOC
400
200
200
-
400
‘
200
*
-
100
0 080 19900
.
100
100
4200
1 OOC
29a
300
9 700
100
■
400
ooo
.
500
600
3200
160
100
.
100
-
160
250
3 500
200
_
_
.
.
2 000
4 000
1 OOC
3 080
8 300
m
460
1 933
1 06C
2 BOO
100
1 05C
..
too
#•
60
Do£ Gloom cmarta irwt;
500 calls rrt-l
IChipfQphyn_________
V
Y
V
V
V
r
r
r
V
Y
Y
Y
Y
V
r
r
r
Y
Y
Y
Y
Y
Y
Y
Y
Y
31
111
35
00
123
204
100
123
41
100
34
10
50
33
120
26
129
279
70
00
69
99
17
33
31
21
N o tw :
1: AH count* a>v*n as num barot calls par rrt u n ln a taxon nama marxad (*) « o « r* tha count appttos to n u ra te n o( c ofcm ln p * i r r i
2: V a lu ta In bold liWteat* ssm plas w t m chlorapftya A m M iir a n a n l th m h o tt has tM tn f » ‘~w 4 K l
3: W h tf» t il* DoE c*B count crflsrton h a t baan a x c M d td by a total count they hava b *a n Idantfflad thus: Y.
Appendix B
Taxon
Phvtoplankton Indat
d
IMhMay
LW
HW
2 t i t Juna
LW
HW
13thJu)y
LW
HW
t7ih Auoint
LW
HW
E:30A8 - RAF Chlvanor
25th April
h#th May
LW
HW
LW
HW
4thOctobar
LW
HW
-------4th Octobar
17th August
LW
HW
LW
HW
13th July
2l i t Juna
LW
HW
LW
-
|HW
SAMPLES LOST
.
.
.
300
BO
1B0
07
200
07
.
Baclllarlophycaaa (Diatoms)
Coniric diatom indat.
A*f#rtonatia *
Bidoutpht*
Chaalocaro* *
CotclncxSbcus
Dttytum
?i.aodarta
Laptocyflndricu* •
Matoataa *
Navtculok)
Nltztchlod
Plauroalgmotd
Rftlzotoltnla
Stephanodiscus
Thafu<ton*ma
10 DOC
200
100
•
100
1 BOO
2 400
•
200
.
2 IOC
300
200
1 BOC
BOO
200
1 200
900
100
250
100
100
-
.
BOO
BO
BO
100
BO
ISO
100
000
60
600
000
1 too
500
1 TOG 4 3 a
100 ,
1 BOC
000
1 36C
BOO
BO
400
300
-
60
100
•
-
BOO
400
19 40C
.
200
-
to o
.
-
too
200
100
-
.
.
.
300
300
.
.
.
.
.
-
TOO
t eoc
19 000
60
700
100
60
100
2 050
1BO
900
260
.
60
BO
2 760
60
BOO
160
660
.
4 900
200
60
_
100
.
.
.
160
160
_
_
_
_
BOO
100
*
07
.
3 IOC
300
60
60
333
133
07
65 0
too
50
_
07
07
9 933
1 033
07
#
.
.
.
160
133
60
360
200
.
-
-
DtaopltycM* (Dlnofltgtllalwt)
Dtnoflagaflata Indal.
*p. d . Gianodlnium
Katodlnlum
Gymnodlnlum
Oymtilnhm
Polykrtkoa •
Pnrtopo/WMjm
SO
.
.
.
.
.
100
.
.
.
.
.
60
.
200
60
.
50
300
200
.
•
60
Olhar Flagatlata*
Flagallala tndal.
Sc*n#}»»iw»
4 00C
6 900
?Maitomonat
UrogJana
EuQlanophycaaa
Chiy$octmmulin»
Piymnatlophycaaa (Haplophyca
0 2OC
2 40C
9 OOC
4 BOC
1 MO
2 060
2 IOC
1 807
400
4 76C
1 660
1 BOO
7 600
3 2SC
200
100
1 BBC
2 007
1 007
1 533
160
200
•
1 30C
-
Cyanophycaaa (Blua Graan Alga
OscJffaforfa *
-
■
.
-
.
DoE Bloom cri(#na mat:
500 call! mi-1
Chlorophyll
Y
IM
V
Y
r
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
18
1M
74
BO
20
31
17
11
S
30
35
13
B0
193
4
47
3
Y
Y
Y
Y
IB
114
11
4
UWWTD . PHVTOPLANKTON FROM TAW ESTUARINE SITES -1999
E30A5 - LfWa Pm
Pltl
28th April
I2na Ma f
HST
LW
HW
24th Jun 9
LW
HW
TO
30th July
LW
MW
I3ih August
LW
HW
1 0OC
100
100
1 OOC
67
29
400
100
200
40
200
400
6 400
2 000
20th Saptambar
HW
LW
E30A8 - Bamttapl •
26th April
b in d kta
lW
HW
LW
HW
Octobar
LW
HW
24th Juna
LW
HW
Jutv
HW
lW
20th Sap ambar
HW
lW
3
>
s
i
Taxon
LW
HW
BacUlariophycaaa (Dlalora)
Cantrtc diatom Mat.
AsttrtorMla ■
Bkidulpttia
C/taatoeanw *
Cotclrtodticu*
Cytlndmpyxb
so
-
*
-
Otyium
Eucsmpi*
LtptocyHndrtcut *
*1a ftu in '
Navlcutotd
Nltitchlod
Plauroalgmoid
700
RhUotohrd*
Th*!*iilan*ma
Tfmluilatlra
3 OOQ 129 40C
■ •
■
30
200
■
100
-
-
■
•
533
87
*
•
•
-
1 OOC
2 OOC
-
-
•
40
1 OOC
100
■
28
100
2 BOO
200
-
200
1 800
1 200 • -
-
-
-
.
400
800
200
-
-
BOO
200
200
100
300
-
100
200
*
200
■
*
200
-
.
800
400
1 400
28
to o
1 500
100
■
40
80
40
200
BOO
200
400
. _
*
2000
400
100
M OOC
200
100
4400
1 200
400
80
_
800
28
to o
2 000
to o
40
•
-
•
-
-
-
-
.
.
.
.
.
.
.
.
.
100
300
400
728
80 800
200
.
1 10C
BOO
„
t OOC
28
700
300
_
400
_
400
200
200
100
to o
800
200
60
-
40
200
200
-
•
60
-
•
Dlnophycaaa (DiraAagattataa)
Dlnoflag atlaia Indrt
CoctUodlntum
Kttodlnfum
Qymnodlntum
Gymdlnlum
Polykttkot •
PtumcBntivm
Protopvwnlurn
-
-
-
-
-
100
-
■
‘
’
ooo
100
-
200
200
-
200
4800
-
200
.
.
000
40
200
*
•
.
_
_
.
.
300
100
200
400
8000
•
400
-
m
*
200
100
60
too
200
11 TOO
8 200
400
40
*
*
*
■
*
4 tOC
240C
'
-
7 30C
1 40C
28
-
OUiac Flagaiiataa
FtagaOata M M .
AcOnrnttrum'
Co• I n t n m '
PtdlMtrum*
Scanadatmus"
4 700
55C
360C
4 50C
2000
123a
Tafts* town*
Ciyptophycaaa
T>ciyophycaaa'
Euglanopfcycaa*
Ctoyaoc/ifwnuUna
Piymnaalophycaaa (Haptophyca
2 200
3 200
200
14 40G
400
33
-
,
-
-
9 400
B 400
8400
2 273
.
200
-
-
-
.
40
.
-
9 20C
_
100
.
.
-
4 400
*
18 80C 10 200
*
1 OOQ
100
4 800
■
*
400
1 200
100
182
3400
*
“
3200
.
*
.
2 200
«
*
•
Cyanopfiycaaa (Blua GrMn AJga^
OacMaloria *
DoE Bloom crttarta mti:
500 call rr#-t
Y
Y
C h l o r o p h y l l ______
0
13
No(n.
Y
V
Y
Y
Y
Y
Y
H NO CHL
V
128
97
98
- 90
88
22
Y
115 NO
8 AMPLE
1; All count* glvan I I numbar of catla par «rt unlati tuo n nama maifcadO whara tin counl appiiaa to numtoare of eoloniaa par mi.
2: Vatuas In botd indlcata »amp*at wttara cttoropftyfl A maasuramanl thraahoid ha* b*an o c m m .
3: No Chi, Indicataa that no Chlorophyll A data h u baan pnwMad.
4: No SimptM. InOWcilM (hat lamplti wtro unabla (o ba taken lor inatyin.
5: Wh*f* th* Do£ cafl counl crtfarta hai baan axcaadad by a total count, but not ilngfa taxa count, may hava baan fdantlflad thua: (Y)
7
B
13
14
107
119
M
39
98
Y
00
Y
87
18
94
Appendix
Taw Estuary Classification Results - 1995 Survey
Biological Survey Description
The nine estuarine Sensitive Areas/Polluted Waters were flown-over at low w ater and
"photographed" using Compact Aerial Spectrographic Imagery (CASI). This system digitally
records the reflected wavelength information from vegetation and physical features and
divides the intertidal area into classes based on this spectral information. As this spectral
data is digital information, the calculation o f the surface area o f each class and hence the
percentage cover of the seaweeds UJva and Enteromorpha is easily generated.
Quality Assurance: The CASI system has been extensively tested in Langstone H arbour
("Langstone Harbour Inter-tidal Vegetation Classification Survey" by R. C. Allen and R. C.
Saull, 1996. A report by the National Rivers Authority National Centre for Instrum entation
& Marine Surveillance). Ground-thjthing field surveys were undertaken by marine biologists
to visually identify features, and photographic and video evidence was collected to test the
accuracy of the images generated.
Taw Classification Results Table 1995
Percentage cover of the algae Enteromorpha and Ulva.
Inter-tidal area: 6160600 m 2
Land Cover Classes
Square Metres
Wet Mud
Dry Mud/Sand
Wet Mud Channels
Algae (50% cover)
Unclassified
909500
4427375
439275
249450
135000
Totals
6160600m2
Percentage
14.76
71.87
7.13
4.05
2.19
100%
Calculated AIgae
2.025
2.025 %
Taw Estuarv Ground-Truthing Site Locations
Site
1) Behind Crow Point
2) Broad Sands .
3) Opposite White House
4) Mouth of River Caen
5) SS Chivenor
6) Yelland Nature Reserve
7) Penthill Point
NGR
SS 4655 3225
SS 4670 3260
SS 4700 3300
SS 4830 3360
SS 4900 3390
SS 4900 3325
SS 5230 3415
The Aerial Survey was carried out on 15 August 1995, and the Biological Survey on 30
August 1995.
I have no information on the duration o f the algae in the estuary.
h
En v ir o n m e n t
A gency
CASI True Colour Mosaic of the River Taw
Taken on the 15th August 1995 at 15:40 - 16:30 G M T
E n v ir o n m e n t
Ag e n c y
Unsupervised Classification of the River Taw Estuary
Taw Classification Results Table 1996
Percentage cover of the algae Enteromorpha and Ulva.
Inter-tidal area: 6160600 m5
"Land C o ver Cl asses
Mud
Dense-green algae
Sparse green algae (40%)
Fucoid algae
Unclassified
Totals
Area (m1*
4699736
127315
751168
90210
492171
6160600 m1
The aerial survey was carried out on the 29th August 1996.
Percentage
~
76.29
2.07
12.19
1.46
7.99
100 %
C alculated Algae
2.07
4.88
6.95 %
The Taw Estuary - False colour mosaic of five CASI images
Images taken on the 29th August 1996 at 13:15 - 13:40 GMT
wM
E n v ir o n m e n t
A gency
The Taw Estuary - True colour mosaic of five CASI images
Images taken on the 29th August 1996 at 13:15 - 13:40 GMT
E n v ir o n m e n t
Ag e n c y
Images taken on the 29th August 1996 at 13:15 - 13:40 GMT
>ffl
The Taw Estuary - Unsupervised classification
Appendix D
T aw estuary sampling m ethod f o r N W C Classification. August 1992
Each intertidal site consisted o f five replicate 0.01m 2 cores, each to a depth o f 150 mm. C o lle c te d
material was sieved on site by puddlingin adjacent w ater on a 0.5 m m mesh sieve. S a m p le s w e r e
then fixed’in 10% buffered formalin for subsequent sorting, identification and e n u m e r a t i o n .
Shore height for each site w as estim ated and was maintained for each replicate. S e d im e n t ty p e
was also noted along with the R P D layer depth (w her the sediment becom es anoxic):
Site
1: Mid Tide L e v e l-L o w W a te r N e a p s (M T L -L W N ) Sand/clay
R pd:
> 15 0 m m
2: M T L -L W N
" Sand/clay
?
3: M T L
Sand
0 mm
4. LW N
M ud/sand
10 m m
5: L W N
Sand
40 m m
6: L W N
M u d /s a n d .
<10mm
12: L o w W ater Springs (L W S )
Sand
> 150 mm
1 3 :L W S
Sand
100 m m
14: LW S
Sand/pebbles
>150 mm
Subiidal samples consisted o f five replicate 0 .0 5 m : Van Veen Grabs with a bite d e p th o f at least
5 cm. Collected material was treated in the same manner as described for intertidal sa m p le s. D e p th
below chart datum ) and sediment type w e re noted:
Site
A. 1m
B 4 m
D: 4.5 m
\l 7 m
Fine clean sand
Clean sand
Sand
Clean sand
Macrobenthic survey 1992 for estuary classification. Subtidal and intertidal sand areas sparsely
inhabited by few taxa, dominated by amphipoda. Mud flats with typical fauna. Sand dwelling
fauna may be susceptible to eutrophic related impact, particularly if macroalgal grow th increases
dramatically It's sparseness may primarily be due to prevailing hydrography. Increased nutrient
input likelv \o trigger faunal changes which do not appear to have manifested as yet (at least by
1 9 9 2 ).
T AW
IW TERT1D*L
SPECIES
DAT A, AupuX
t f l f l?
Tabla 4.2 : Tav-Torridg* Subtidal Sp«cias Raw Data
SPECIES
MCS TO. SAMPLES
Al
A2
A3
A4
A5
B1
B2
B3
B4
B5
-
-
1
-
1
-
-
1
_
_
_
_
-
POLTQtACTA : ANNELIDA
Etaona longa
Naphtys cirroaa
PacaoniS Culgans
Pygospio •lagans
Spio aartinaruis
Capitalla sp. complax
P205
P870
71196
P1317
P1337
P1531
-
-
-
-
-
-
-
2
-
-
5
-
-
-
-
-
314
3
4
-
-
-
-
_
-
-
_
_
1
_
-
-
-
-
3
12
2
269
4
1
-
_
32
6
-
-
I
-
-
-
-
CRUSTACEA : AKPHIPODS
Pontocratas altamarinus
Bathyporaia nana
Bathyporaia palaqica
Bathyporaia pilosa
Hauatorius aranarlun
Corophiua volutator
_
S233
S744
S745 ' S746
325
S754
10
1
SL027
256- 246
6
O
4
2
-
_
-
-
4
4
2
-
-
-
1
-
-
11
_
CRUSTACEA : ISOPODS
Sphairoaa nonodi
S1450
-
-
-
CRUSTACEA : T A N M D ACEA
Tanaiasua 1111jaborgii
S1961
ITCMEPrrEAN
R*mrtaa indat.
2
3
I
I A p pendix L
B arn sta p le
N G R : SS 558 328
N G R : SS 553 333
v -T
..
_
'T'z- — ■w
* **~
jaBK«—
-r.»jrwi ••”m«. ^
■
• > i ...
Hr-, •T
- \c
,e . r v
/ ''
^
•
■
c c .-•«£11v ? * *
• *"
v^. V ,-S: ^
^•
-v S
sT»
■
■••••
•
\J0F
"
•£ « > 3 p &
---- -- ------ i £ s ^
■ ■■’■
•■ ' "■
'*«'
■*"
^ -C^CT>
S R ; a . I C“
V- -.*
». v »-V
V ^ W l j S * *.
' ~*“tf ^*iA%
• ■W> y * .» ?* 5 r j ’r~--i—-*v
‘J t 4
:•*> ^
> ''V
'V V
V' \
\
'
t.
.
V
>
,r -
vV
v
'v '■'
'
v -v ^'..\
^ J W » «atV 7"V X.~T~- N
.
r
“
\
■•. “• v\
W
V '*.
v
^
vV *
Y v 'v
\
^^K S L V
X
»
:
•
v
v \
Details for Incident n u m b e r : F 6 2 0 1 2 4 6 1
Date : 08/06/95
Time
0900
ow Received
LETTER
BROWN C C
Kd e c e i v e d By
Investigating
O
f
f
i
c
e
r
B
ROWN C C
I
eported By
MRS B A K E R
Tel.
ddress
P
O
R
T
E
R
I
N
C
O
P
L
E
Y
D
R
I
V
E
BARNSTAPLE
t
eported Incident
POLLUTION ON RIVER TAW A T CASTLE QUAY B A R N S T A P L E
I
ource Name
I ddress
Catchment
c
arish
I JGR
f
ALGAL BLOOM
TAW ESTUARY
ST LEVAN
SS 5550 3320
rimary Incident C o d e ZX
D
9
4Q
inter 'N' - Next Screen,
Samples Taken
NO
OTHER
WEATHER
NATURAL EVENT
CHINA CLAY ■
'Q'
- Quit,
or I n c i d e n t ^ n u m b e r {
TYPE
ONLINE
READY
• D e t a i l s for Incident n u m b e r : T 6 2 0 1 2 4 6 7
D a t e : 16/06/95
Time : 1035
J h o w Received
TELEPHONE
Rece ived By
CONTROL ROOM
Investigating Offi c e r B R O W N C C
Reported By
MR BOOTH
Tel.
Address
I M P E R I A L HOTEL, B A R N S T A P L E
Reported Incident . _
T H E T I D E - I S C O M I N G IN B R O W N A N D F R O T H Y L A S T N I G H T
: A BOAT TIPPED A B U C K E T FULL O F R U B B I S H O V E R THE SIDE
«
1
■
(
Source Name
Address
Catchment
flparish
NGR
ALGAL BLOOM
TAW ESTUARY
ST L E V A N
SS 5550 3320
^ P r i m a r y Incident C ode ZX
D
9
4Q
i
inter 'N'
- Next Screen,
S a m p l e s Taken
NO
OTHER
WEATHER
NATURAL EVENT
CHINA CLAY
'Q'
- Quit,
or Incident number {
TYPE
ONLINE
}
READY
I
Appendix F
outh West Region
INCIDENT REPORT
I
Tnccident Number__ _
17510
Problea...........
POLLUTION RISK - WATER QUALITY (PQ)
1043 11-Feb-97
Priority.... Immediate (2 Hours)
f p o r t e d by....... HIKE BISHOP (by Telephone) Phone 0831 825864
Reporters Address.. EA
t
ident Location.. BY PILL FARM ON RIVER TAU
ce (Gazetteer).'. BARNSTAPLE 30A SS558332
Jater Stretch ID... 50/30A/000/01S
^ t c h n e n t ......... TAW ESTUARY
Area..............
Devon
B^ercourse....... TAW ESTUARY - SOUTH BANK
W - e t c h ........... L0NGBRIDGE - INST0W
M s h Deed......... 0
Fish Distressed___ 0
I
°ollution Confirned None
(0)
Uution Source... HISC PREMISES
UNKNOWN (HU)
Ilutant......... MISCELLANEOUS
ALGAE (HA)
I
t
I
ILS
ATIVE PHONE IN TO SAY RIVER IS 'AWFUL GREEN' BY PILL FARM ON RIVER TAU.
’PARENTLY THIS IS ON THE BARNSTAPLE SIDE OF THE NEW BRIDGE OVER THE TAU.
SSIVE ALGAE GROWTH DUE TO LOW FLOWS AND ELEVATED NUTRIENT STATUS IN
ARY. MONITORS IN PLACE DURING SUMMER '96 TO HELP CASE FOR CLASSIFYING
.TUARY AS “SENSITIVE WATERS".
I“
rred
ceived
at 1555 on 19-AUG-96
at 1555 on 19-AUG-96 by Area Environnental (Devon)
ONDED at 1610 on 19-AUG-96 by Area Environmental (Devon)(SEAMANJ)
1755 on 19*AUG*96
1 et Date
■npleted at 1620 on 30-AUG-96
••Tip
I
LES
amples are recorded as being specifically relevant to this incident.
i
i
i
i
i
I
i
i
I
South West Region
I
INCIDENT REPORT
1038 ll-Feb*97
ncident Number___ 17711
Problem...........
Priority__ _ IBaaediate (2 Hours)
POLLUTION RISK - WATER QUALITY (PQ)
[eported by....... MR J WEIR (by Telephone) Phone 0127173361
I
Reporters Address.. NORTH DEVON LEISURE CENTRE
ncident Location.. NORTH DEVON LEISURE CENTRE
Blace-(Gazetteer) .. BARNSTAPLE 30A SS558332
water Stretch ID... 50/30A/000/01S
Catchment......... TAW ESTUARY
_
Area..............
Devon
I
ntercourse.. .... TAU ESTUARY - SOUTH BANK
tretch........... LONG BRIDGE - INSTOU
Fish
Dead......... 0
Fish Distressed.... 0
Fi
I
I
Pollution Confiroed None
(0)
f
Pnllution Source... MISC DRAINAGE
llutant......... MISCELLANEOUS
RIVER (DR)
ALGAE (HA)
AILS
t
LER REPORTED 'SHIT' FLOATING UP THE RIVER TAW. SEEN FREQUENTLY AND HAS BEEN
HAPPENING FOR AGES. IT'S BAD EVERYDAY I
I
AE SCUM SLICK FORMING AT FRESH / SEA WATER CONFLUENCE. NATURAL OCCURANCE
CH IS WORSE THIS YEAR. MONITORS IN PLACE TO INVESTIGATE POSSIBLE WATER
1UALITY PROBLEMS AS A RESULT AND OBTAIN EVIDENCE TO CLASSIFY ESTUARY AS
‘SENSITIVE WATERS“.
I
............ .....................................................................................................
Occurred
eived
I
at 1015 on 02-SEP-96
at 1016 on 02-SEP*96 by Area Environnental (Devon)(AHRAOUIP)
PONDED at 1017 on 02-SEP-96 by Area Environmental (Devon)(SEAMANJ)
arget Date
1216 on 02-SEP-96
^ p l e t e d at 090? on 20-SEP-96
.wnPLES
^ Samples are recorded as being specifically relevant to this incident.
I
I
I
I
I
I
I
I
I
South Wast Region
INCIOENT REPORT
1107 11-Feb-97
Incident Number--- 15757
Priority.... Immediate (2 Hours)
Problem........... POLLUTION RISC - WATER QUALITY (P9)
I
I
Reported
by....... HR CROVFORD (Y) (by Telephone) Phone 01271 388353
eporters Address.. NORTH DEVON DC
Incident Location.. BARNSTAPLE
I Place (Gazetteer).. BARNSTAPLE 30A
water Stretch ID... 50/30A/000/01N
[Catchment......... TAW ESTUARY
SS558332
Area..............
Devon
Watercourse....... TAW ESTUARY - NORTH BANC
Stretch........... LONGBftlDGE - CROW POINT
ish Dead......... 0
Fish Distressed--- 0
I
Pi
Pollution
Confirmed None
(0)
ollution Source... HISC PREMISES
I
ollutant......... MISCELLANEOUS
UNKNOWN (HU)
ALGAE (HA)
( tails
LOG.411/226. CREAMY COLOURED FOAM ON SURFACE OF RIVER YEO, OUTSIDE CIVIC
NTRE, BARNSTAPLE.
I
ONE EWAN CRAWFORD NDDC (EMERG. OFICER) INFORMED OF ALGAEL BLOOM AT PRESENT IN
TUARY; NATURAL OCCURRENCE AND NOT POLLUTION. J SEAMAN
I curred
Re
Rece.ived
at 1644 on 30-MAY-96
at 1646 on 30 -MAY -96 by fiegional Cocas Centre
‘ferred at 1651 on 30-HAY-96 to Area Environmental (Devon)
^SPONDED at 1652 on 30-HAY-96 by Area Environmental (Devon)(SEAMANJ)
Target Date 1846 on 30-HAY-96
I
mpleted at 1511 on 10-JUN-96
HPLES
Samples are recorded as being specifically relevant to this incident.
Taw-Pill 29/02/96 02/04/96
140
D.O.%
Sat
120
100
D.O.% Sat
UK
80
60
L--------
25~Feb-96
06-Mar-96
16-Mar-96
Date
26-Mar-96
05-Apr-96
iTAW -CHIVENOR 04/04/96 - 28/10/96
D0%
Sat
200
A p p e n d ix
Ignore readings - meter re q u irin g recalihrjition
; i n d Helms m U r r f i n n nn snntlr
Taw Torridge Estuary - Input Flows - 1994 to 1996
Flows in m3/s (logarithmic scale)
River flows at Tidal Limit from scaled (using MLF) flows at Umberleigh & Torrington GS
All STW flows are DWF
— Taw
Torridge
Ashford
Velator
Yelland
100
300
500
700
Day (1 Jan 1994 -31 Oct 1996)
900
(jKAf/4 J
Concentration (mg/l)
Taw Torridge Estuary - Input Concentrations - 1994 to 1996
200
100
400
300
600
500
800
700
Day (1 Jan 1994 -31 Oct 1996)
1000
900
Taw Torridge Estuary - Input Loads - 1994 to 1996
Calculated by: Total Inorganic Nitrogen x Flow!
Load
in g/sec (Logarithmic scale)
10000
1000
Taw
100
10
Torridge
Ashford
-
Velator
1
0.1
Yelland
-
-
0.01
200
100
400
300
600
500
800
700
Day (1 Jan 1994 - 31 Oct 1996)
1000
900
Jc.
E30W
TAW(ESTUARY MONITORING P T S ) : 1995:M0BELLED NITROGEN
T im e
731
A pp e a d ix
Taw (E30A5) : Summer 1995 : Modelled Nitrogen-All d is c h a rg e s ]
0.8
----------- -----— — "
Concentration (mg/l)
M ean value =
0.13
:
0.6
0.4 -
0.2
-
470
490
510
530
550
'5 7 0
590
6'10
630
!
Day (470=15 Apr 1995)
Taw (E30A5) : Summer 1995 : Modelled Nitrogen-No A shford [
0.8
|Mean value =
0.10
Concentration (mg/l)
[
470
490
510
530
550
570
590
Day (470=15 Apr 1995)
610
630
7 « 0 ‘)
!
____ ______ I
Taw (E30A6) : Summer 1995 : Modelled Nitrogen-All d isch a rg e s I
I, i
*
- ■
0.6
Concentration (mg/l)
[Mean value
0.4 [
0.2
470
490
510
530
550
570
590
{?;:/>/?/ /
630
b (/ )
j
Day (470=15 Apr 1995)
610
|Taw (E30A6) : Summer 1995 : Modelled Nitrogen-No A sh fo rd j
Concentration (mg/l)
0.6
0.4 r
0.2
•-
0 —!
470
490
510
530
550
570
590
Day (470=15 Apr 1995)
610
630
7/-, /
Taw (E30A7) : Summer 1995 : Modelled Nitrogen-All discharges |
470
490
510
530
550
570
590
610
630
Day (470=15 Apr 1995)
Taw (E30A7) : Summer 1995 : Modelled Nitrogen-No A sh fo rd I
0.3
cn
E
c
o
ro
C
0>
o
c
o
O
Day (470=15 Apr 1995)
Taw (E30A8) : Summ er 1995 : Modelled N itrogen-A ll discharges}
0.15
M ean va lu e
Concentration (mg/l)
0.02
0.05
490
510
530
550
570
590
Day (470=15 Apr 1995)
610
630
7o( (> '
j
470
iTaw (E30A8) : Summer 1995 : Modelled N itrogen-N o
0 .1 5 -------M ean value
Concentration (mg/l)
0.01
0.1
0.05
0 . - j --------------- --
470
490
510
530
550
570
590
D ay (470=15 A pr 1995).
610
630
Appendix ^
iTaw Estuary (U/S Ashford): 1995:Modelled N itrogen-A ll discharges
!
Point is 500m upstream of Ashford S T W outlall
Concentration (mg/l)
iMean=
0.33
3 r
2 r
1 r
i i
396 426
456
486 516 546 576 606 636
Day (366= 1 January 1995)
666
696
726
II
1
366
Taw Estuary (U/S Ashford):1995:Modelled N itrogen-N oA shford
|________ Point is 500m upstream of Ashford STW outfall
5
—
Concentration (mg/l)
iM ean=
4 -
I 0.31
3 r
-
2 r
J
366
396
426
456
486 516 546 576 606 636
Day (366= 1 January 1995)
666
696
,
726
u jD
Concentration (mg/l)
Taw Estuary (D/S Ashford): 1995:Modelled Nitrogen-All discharges
Point is 500m downstream of Ashford STW outfall
Day (366= 1 January 1995)
j
L c.
Concentration (mg/l)
Taw Estuary (D/S Ashford):1995:M odelled N itrogen-N oA shford
Point is 500m downstream of Ashford STW outfall
Day (366= 1 January 1995)
/
b ri
TAW ESTUARY - BARNSTAPLE 22/04/94 to 12/11/96
TON vs Salinity
-------------------------------------- ------
8 r
—
...... ........ *
—
.
......
. ----------------------------------------- i------------------------
i
ra
TON
(filtered) mg/l
6 (s-
0
10
20
30
Salinity ppt
A p p e n d ix
TAW ESTUARY - ASHFORD STW 13/01/94 to 12/11/96
TON vs Salinity
TON (filtered) mg/l
8
0
10
20
Salinity ppt
30
40
TAW ESTUARY - BY LITTLE PILL 22/02/94 to 12/11/96
TON vs Salinity
0
5
10
15
Salinity ppt
20
25
30
TAW ESTUARY - RAF CHIVENOR 22/02/94 to 12/11/96
TON vs Salinity
0
10
20
Salinity ppt
30
40