Department of Civil and
Environmental Engineering
IIHR – Hydroscience &
Engineering
Coralville Reservoir
Water Quality Project
Monthly Report, June 2004
Claudia Espinosa-Villegas
Craig Just
Tatsuaki Nakato
Jerald Schnoor
.
.
.
.
.
.
General Conditions
.
.
Samples were collected. on Jun 3rd, 10th and 23rd at all river and reservoir locations. The
general conditions and hydrologic parameters for each sampling event are highlighted in
Table 1. The stream flow data is taken from the USGS website and is considered
provisional.
Table 1: General conditions and hydrologic parameters for each sampling event.
Date
Air Temp.
Noon
○
3-Jun-04
10-Jun-04
23-Jun-04
Date
3-Jun-04
10-Jun-04
23-Jun-04
○
C
F
12.2
54.0
20.0
68.0
23.3
73.9
Inflow, USGS05453100
max
min
mean
cfs
cfs
cfs
12,500
11,500
12,000
5,340
4,290
4,590
4,570
4,069
4,300
Sky
Previous Day
Precipitation
inches
Scattered Clouds
0.04
Rain
0.01
Partly Cloudy
None
Pool Level
Outflow, USGS05453520
max
min
mean
cfs
cfs
cfs
ft msl
5980
5820
5900
698.86
na
na
na
702.34
5,930
5,820
5,870
700.61
Water Quality Observations
The physical, chemical and biological water quality results are shown in Table 2 and
Table 3 for the reservoir and river locations. Quality assurance and quality control data
are shown in Table 4 and Table 5. The field report(s) for the month are included in
Appendix A.
The water temperature was between 20.0 and 24.0 degrees Celsius for all samples
collected in Jun 2004. Dissolved oxygen concentrations were between 3.7 and 7.8 mg/L
for all samples with one surface sample (Jun 23, reservoir surface) falling below the 5
mg/L criterion. The pH values were between 6.58 and 7.68 for all samples with a mean
of 7.31. Titrated carbon dioxide values were between 21.5 and 49.5 mg/L with a mean of
33.4 mg/L for all samples. Phenolphthalein alkalinity was <0.1 mg/L as CaCO3 for all
samples except for the upstream location on Jun 10th (6 mg/L as CaCO3) and the
downstream location on Jun 23rd (2 mg/L as CaCO3). The minimum total alkalinity
concentration was at the downstream location on Jun 3rd (124 mg/L as CaCO3) and the
maximum concentration was at the upstream location on Jun 10th (206 mg/L as CaCO3).
Calcium hardness was between 118 and 216 mg/L as CaCO3 for all samples and total
hardness was between 142 and 270 mg/L as CaCO3 with a mean of 213 mg/L as CaCO3.
Ammonia nitrogen concentrations were between 0.2 and 0.4 mg/L-N for all samples and
the nitrite nitrogen concentrations were between 0.01 and 0.20 mg/L-N for all samples.
The nitrate concentration was lowest at the downstream location on Jun 3rd (4.6 mg/L-N)
and greatest at the upstream location (9.9 mg/L-N) on Jun 10th. Total Kjeldahl nitrogen
1
.
.
.
. 0.56 and 2.63 mg/L-N for all samples with a mean of 1.49
concentrations were between
. concentration was lowest at the downstream location on Jun
mg/L-N. The total nitrogen
.
3rd (5.3 mg/L-N) and. greatest at the upstream location (12.5 mg/L-N) on Jun 10th.
Orthophosphate was between
0.24 and 0.31 mg/L-P for all samples and total phosphorus
.
was between 0.28 and. 4.64 mg/L-P for all samples. The extraordinarily high total
rd
phosphorus concentration at the upstream location on Jun 23 may have been the result
of sample bottle contamination or some other unknown source of contamination. The
duplicate (upstream location) total phosphorus analysis result for the Jun 23rd sample
event was 4.7 mg/L-P indicating that the analysis was reproducible and likely not the
result of a lab analysis error.
Silica concentrations were between 5 and 18 mg/L as SiO2 for all samples in Jun 2004.
Total organic carbon concentrations were between 3.7 and 14.1 mg/L with a mean of 7.4
mg/L. The total suspended solids concentration was less than 10 mg/L at all reservoir
locations on Jun 10th and a high of 166 mg/L was determined for the upstream location
on Jun 10th. Biological oxygen demand was lowest at the reservoir bottom (1.4 mg/L) on
Jun 23rd and was greatest (4.1 mg/L) at the reservoir mid-depth location on Jun 3rd.
Additional ions were determined for the Jun 3rd sampling event resulting in ion balances
between -9.0 and 1.5 percent difference. Pigments were determined for all samples in
Jun 2004 with the exception of the mid-depth location on Jun 10th which was lost due to a
lab error. The chlorophyll a concentration was very low for all samples with a
concentration maximum of only 15.70 mg/m3. The pheophytin a concentrations were
between 6.06 and 48.97 mg/m3 for all samples. Chlorophyll b and c concentrations were
below 6.25 mg/m3 for all samples collected in Jun 2004.
All lab results for indicator organisms were less than the one time maximum criterion of
235 cfu/100 mL except for the upstream location on Jun 23rd which had values of 2,300
and 1,700 cfu/100 mL for fecal coliform and E. coli respectively.
2
Table 2: Results, Jun 2004.
Date
Water
Diss.
Temp.
Oxygen
○
C
.
.
.
.
.
.
.
. pH
.
mg/L
Coralville Reservoir Water Quality
Physical, Chemical and Biological Analysis - Table 1 of 2
Carbon Dioxide
Titr.
Calc.
mg/L
mg/L
Alkalinity
Hardness
Phenolth. Total Calcium Total NH3-N NO2-N NO3-N
mg/L
mg/L
mg/L
Iowa River Upstream (Green Castle Avenue)
3-Jun-04
20.0
6.7
7.33
33.5
14.7
<0.1
158
184
10-Jun-04
23.5
6.1
7.51
29.9
12.7
6
206
200
23-Jun-04
22.7
5.7
7.68
26.5
8.0
<0.1
192
196
Coralville Reservoir - SURFACE (Downstream from Lake McBride at Mehaffey Bridge)
3-Jun-04
20.6
7.0
7.32
21.5
12.0
<0.1
126
156
10-Jun-04
23.3
5.3
7.18
30.5
18.7
<0.1
142
160
23-Jun-04
24.0
4.5
7.54
34.0
11.6
<0.1
201
192
Coralville Reservoir - MID-DEPTH
3-Jun-04
20.5
7.1
7.34
30.5
11.7
<0.1
128
142
10-Jun-04
23.0
6.0
7.34
34.7
14.6
<0.1
160
156
23-Jun-04
24.0
4.1
7.53
37.0
11.9
<0.1
202
184
Coralville Reservoir - BOTTOM
3-Jun-04
20.6
6.5
7.35
26.5
11.4
<0.1
128
136
10-Jun-04
22.6
4.7
7.33
43.1
14.0
<0.1
150
160
23-Jun-04
23.9
3.7
7.51
46.5
12.2
<0.1
198
216
Iowa River Downstream - University Water Plant (Iowa City)
3-Jun-04
20.7
7.8
6.58
24.0
65.2
<0.1
124
118
10-Jun-04
22.4
6.3
7.06
33.1
26.4
<0.1
152
156
23-Jun-04
23.6
5.9
7.07
49.5
31.6
2
186
190
MIN
MAX
MEAN
20.0
24.0
22.3
3.7
7.8
5.8
6.58
7.68
7.31
21.5
49.5
33.4
8.0
65.2
18.5
Nitrogen as N
<0.1
6
na
124
206
164
118
216
170
Phosphorus as P
TKN
Total
Ortho-P
Total-P
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
192
270
262
0.2
0.2
0.2
0.05
0.05
0.01
6.8
9.9
9.8
1.13
2.63
2.44
8.0
12.5
12.2
0.24
0.31
0.30
0.29
0.39
4.64
178
210
254
0.4
0.4
0.3
0.12
0.13
0.05
4.9
7.6
6.2
0.56
2.25
1.50
5.6
9.9
7.7
0.28
0.25
0.28
0.32
0.30
0.28
180
202
252
0.4
0.4
0.3
0.13
0.13
0.20
5.0
7.5
6.2
1.13
1.69
1.69
6.3
9.3
8.1
0.29
0.27
0.26
0.36
0.40
0.28
150
204
250
0.3
0.4
0.3
0.13
0.15
0.19
4.8
6.8
6.1
0.56
1.50
2.06
5.5
8.4
8.4
0.30
0.28
0.26
0.30
0.33
0.29
142
196
246
0.4
0.3
0.3
0.12
0.13
0.16
4.6
7.2
5.8
0.56
0.94
1.69
5.3
8.3
7.7
0.29
0.29
0.27
0.33
0.37
0.54
142
270
213
0.2
0.4
0.3
0.01
0.20
0.12
4.6
9.9
6.6
0.56
2.63
1.49
5.3
12.5
8.2
0.24
0.31
0.28
0.28
4.64
0.63
3
Table 3: Results, Jun 2004.
Date
Silica
TOC
as SiO2
mg/L
mg/L
.
.
.
.
.
.
.
TSS
.
.
mg/L
Coralville Reservoir Water Quality
Physical, Chemical and Biological Analysis - Table 2 of 2
BOD5
Additional Anions
Cl
mg/L
mg/L
SO4
mg/L
Additional Cations
Na
mg/L
K
Ion
Balance
mg/L
Iowa River Upstream (Green Castle Avenue)
3-Jun-04
12
6.6
20
3.5
14.3
19.6
10.5
4.0
10-Jun-04
12
3.8
166
2.8
na
na
na
na
23-Jun-04
14
14.1
134
1.9
na
na
na
na
Coralville Reservoir - SURFACE (Downstream from Lake McBride at Mehaffey Bridge)
3-Jun-04
15
6.8
16
4.0
11.7
16.5
10.7
5.3
10-Jun-04
5
5.0
<10
2.0
na
na
na
na
23-Jun-04
14
9.4
17
2.2
na
na
na
na
Coralville Reservoir - MID-DEPTH
3-Jun-04
14
5.7
16
4.1
12.0
17.1
7.0
5.2
10-Jun-04
7
7.3
<10
3.0
na
na
na
na
23-Jun-04
13
8.1
43
1.8
na
na
na
na
Coralville Reservoir - BOTTOM
3-Jun-04
10
6.9
11
3.5
12.0
16.7
7.4
5.2
10-Jun-04
10
4.8
<10
2.4
na
na
na
na
23-Jun-04
12
9.8
20
1.4
na
na
na
na
Iowa River Downstream - University Water Plant (Iowa City)
3-Jun-04
6
9.9
33
3.9
12.1
17.2
12.3
5.0
10-Jun-04
12
3.7
27
2.3
na
na
na
na
23-Jun-04
18
8.7
51
2.4
na
na
na
na
MIN
MAX
MEAN
5
18
12
3.7
14.1
7.4
<10
166
na
1.4
4.1
2.7
11.7
14.3
12.4
16.5
19.6
17.4
7.0
12.3
9.6
4.0
5.3
4.9
Pigments
chl a
pheo a
3
Indicator Org.
chl b
3
mg/m
chl c
3
Fecal
3
E. coli
% diff.
mg/m
-7.9
na
na
<1
<1
<1
48.97
33.96
14.02
2.00
2.00
<1
6.25
4.34
<1
120
160
2300
120
160
1700
1.5
na
na
<1
<1
15.70
15.70
14.49
6.06
<!
2.16
<1
1.53
3.71
1.98
18
<10
<10
18
<10
<10
-2.7
na
na
<1
na
<1
14.30
na
37.13
1.48
na
1.84
2.70
na
3.88
20
<10
10
10
<10
10
-9.0
na
na
<1
<1
7.65
12.34
7.33
8.92
<1
1.01
<1
<1
1.56
1.93
20
10
<10
20
<10
<10
-4.9
na
na
<1
<1
<1
14.58
11.87
25.73
2.12
<1
2.53
3.47
<1
4.06
150
82
230
150
80
210
-9.0
1.5
-4.6
<1
15.70
na
6.06
48.97
na
<1
2.53
na
<1
6.25
na
<10
2300
na
<10
1700
na
mg/m
mg/m
Org. / 100 mL
4
.
.
Table 4: Quality Assurance/Control,
. Jun 2004.
.
.
Coralville Reservoir Water Quality
.
QA/QC: Physical, Chemical and Biological Analysis - Table 1 of 2
.
Date
Water
Diss. . pH
Carbon Dioxide
Alkalinity
Hardness
Nitrogen as N
.
Temp.
Oxygen
Titr.
Calc. Phenolth. Total Calcium Total NH -N NO -N NO -N TKN
3
○
C
Duplicate (O)
3-Jun-04
na
% diff.
na
10-Jun-04
na
% diff.
na
23-Jun-04
na
% diff.
na
Replicate (WP)
3-Jun-04
na
% diff.
na
10-Jun-04
na
% diff.
na
23-Jun-04
na
% diff.
na
Standards (% Recovery)
3-Jun-04
na
10-Jun-04
na
23-Jun-04
na
Spikes (% Recovery)
3-Jun-04
na
Spike 2
na
Spike 3
na
10-Jun-04
na
Spike 2
na
Spike 3
na
23-Jun-04
na
Spike 2
na
Spike 3
na
mg/L
2
3
Phosphorus as P
Total
Ortho-P
Total-P
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
na
na
na
na
na
na
na
na
na
na
na
na
31.5
6.0
31.0
-3.7
44.0
-66.0
na
na
na
na
na
na
<0.1
0.0
<0.1
0.0
4
0.0
158
0.0
198
3.9
182
5.2
166
9.8
164
18.0
204
-4.1
192
0.0
260
3.7
264
-0.8
0.19
-11.8
0.15
6.3
0.28
-16.7
0.05
3.7
0.05
-11.1
0.02
-14.3
6.76
0.3
9.3
5.6
10.4
-6.3
1.13
0.0
2.40
2.4
2.40
1.6
7.9
0.3
11.8
6.2
12.8
-4.8
0.24
0.0
0.25
19.4
0.29
3.3
0.31
-6.9
0.33
15.4
4.7
-1.3
na
na
na
na
na
na
na
na
na
na
na
na
26.0
-8.3
39.9
-20.5
30.0
39.4
na
na
na
na
na
na
<0.1
0.0
<0.1
0.0
2
0.0
120
3.2
148
2.6
188
-1.1
120
-1.7
120
23.1
188
1.1
144
-1.4
152
22.4
240
2.4
0.34
2.9
0.24
20.0
0.39
-21.9
0.11
4.3
0.05
61.7
0.16
1.8
4.69
-2.0
na
na
6.7
-15.5
0.56
0.0
0.75
20.0
1.5
11.1
5.4
-1.6
na
na
8.4
-9.3
0.24
17.2
0.28
3.4
0.47
-74.1
0.27
18.2
0.46
-24.3
0.56
-3.7
na
na
na
na
na
na
na
105
na
na
na
na
na
na
na
100
92
na
na
na
na
100
na
na
99
97
106
na
na
na
78
92
93
na
na
na
82
81
92
124
112
118
109
115
109
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
60
50
50
86
89
78
90
100
145
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
100
115
na
71
83
na
96
93
97
na
na
na
na
na
na
na
na
na
100
105
113
105
88
100
100
95
97
94.9
94.8
93.7
98.9
100
103.4
100.4
93.9
90.8
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
105.7
93.6
89.1
111.3
102
over
84.9
92
127
87.6
84.5
90.8
94.4
109
na
100
99.8
over
5
.
.
Table 5: Quality Assurance/Control,
. Jun 2004.
.
.
Coralville Reservoir Water Quality
.
QA/QC: Physical, Chemical and Biological Analysis - Table 2 of 2
.
Date
Silica
TOC
TSS
Pigments
. BOD Additional Anions Additional Cations Ion
.
as SiO
Cl
SO
Na
K
Balance chl a
pheo a
chl b
Indicator Org.
5
2
mg/L
chl c
4
mg/L
Duplicate (O)
3-Jun-04
11.8
7.2
% diff.
2.5
-9.1
10-Jun-04
11.7
3.9
% diff.
5.6
-2.6
23-Jun-04
10.8
14.8
% diff.
21.7
-5.0
Replicate (WP)
3-Jun-04
7
9.4
% diff.
-14.0
5.1
10-Jun-04
8
5.8
% diff.
35.5
-56.8
23-Jun-04
9
9.5
% diff.
50.9
-9.2
Standards (% Recovery)
3-Jun-04
190
96
10-Jun-04
100
98
23-Jun-04
160
na
Spikes (% Recovery)
3-Jun-04
90.1
120.0
Spike 2
94.9
117.0
Spike 3
97.1
97.0
10-Jun-04
37.9
56.0
Spike 2
76.6
42.0
Spike 3
91.3
na
23-Jun-04
167.6
65.0
Spike 2
98.8
100.0
Spike 3
83.8
71.0
3
3
3
mg/m
Fecal
3
E. coli
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
% diff.
mg/m
16
20.0
106
36.1
114
14.9
na
na
na
na
na
na
14.8
-3.2
na
na
na
na
19.8
-1.0
na
na
na
na
11.4
-9.1
na
na
na
na
4.3
-6.7
na
na
na
na
-7.2
8.8
na
na
na
na
<1
na
2.14
na
<1
na
51.05
-4.2
23.28
31.4
20.83
-48.6
4.70
-135.0
0.06
97.0
4.97
na
10.35
-65.6
<1
na
8.29
na
100
16.7
140
12.5
1400
39.1
100
16.7
140
12.5
1400
17.6
24
27.3
14
48.1
43
15.7
na
na
na
na
na
na
12.1
0.0
na
na
na
na
17.2
0.0
na
na
na
na
11.0
10.8
na
na
na
na
4.8
4.4
na
na
na
na
-5.1
-4.3
na
na
na
na
<1
na
<1
na
8.30
na
11.94
18.1
14.99
-26.3
12.55
51.2
<1
na
3.52
na
3.92
-54.9
<1
na
5.07
na
5.90
-45.3
82
45.3
20
75.6
150
34.8
82
45.3
50
37.5
64
69.5
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
na
mg/m
mg/m
Org. / 100 mL
6
.
.
.
Appendix A: Supporting Information
.
.
Coralville Reservoir Water Quality - Field Report
.
Physical and Chemical Analysis
.
. Diss. pH Carbon Alkalinity
Date
Water
Hardness
Air Temp.
Location
. Oxygen
Temp.
Dioxide Phenolth. Total Calcium Total
○
Upstream
Res-Surface
Res-Mid
Res-Bottom
Downstream
3-Jun-04
3-Jun-04
3-Jun-04
3-Jun-04
3-Jun-04
C
mg/L
20.0
20.6
20.5
20.6
20.7
6.7
7.0
7.1
6.5
7.8
7.33
7.32
7.34
7.35
6.58
mg/L
mg/L
mg/L
mg/L
mg/L
33.5
21.5
30.5
26.5
24.0
<0.1
<0.1
<0.1
<0.1
<0.1
158
126
128
128
124
184
156
142
136
118
192
178
180
150
142
○
C
12.2
12.2
12.2
12.2
12.2
Sky
Previous Day
Precipitation
inches
Scattered Clouds
Scattered Clouds
Scattered Clouds
Scattered Clouds
Scattered Clouds
0.04
0.04
0.04
0.04
0.04
○
F
54.0
54.0
54.0
54.0
54.0
Comments:
7
Location
Date
.
.
.
.
.
.
Water
.
Temp.
C.
.
○
Upstream
Res-Surface
Res-Mid
Res-Bottom
Downstream
10-Jun-04
10-Jun-04
10-Jun-04
10-Jun-04
10-Jun-04
23.5
23.5
23.0
22.6
22.4
Coralville Reservoir Water Quality - Field Report
Physical and Chemical Analysis
Diss.
Oxygen
mg/L
pH
6.1
5.3
6.0
4.7
6.3
7.51
7.18
7.34
7.33
7.06
Carbon
Alkalinity
Hardness
Dioxide Phenolth. Total Calcium Total
mg/L
mg/L
mg/L mg/L mg/L
29.9
30.5
34.7
43.1
33.1
<0.1
<0.1
<0.1
<0.1
<0.1
206
142
160
150
152
200
160
156
160
156
270
210
202
204
196
Air Temp.
○
C
20.0
20.0
20.0
20.0
20.0
Sky
Previous Day
Precipitation
inches
Rain
Rain
Rain
Rain
Rain
0.01
0.01
0.01
0.01
0.01
○
F
68.0
68.0
68.0
68.0
68.0
Comments:
On the day of sampling there was 0.94 inches of rain, mostly during the sampling. The upstream location was flooded, about 1-2 ft higher than June 3, 2004. The
access road was competely flooded, and could not even get to Country road F-20 in order to get to the alternate upstream site. Had to go back and take I-80 to
reach alternate upstream site in Amana, IA.
8
Location
Date
.
.
.
.
.
.
Water
.
Temp.
C.
.
○
Upstream
Res-Surface
Res-Mid
Res-Bottom
Downstream
23-Jun-04
23-Jun-04
23-Jun-04
23-Jun-04
23-Jun-04
22.7
24.0
24.0
23.9
23.6
Coralville Reservoir Water Quality - Field Report
Physical and Chemical Analysis
Diss.
Oxygen
mg/L
pH
5.7
4.5
4.1
3.7
5.9
7.68
7.54
7.53
7.51
7.07
Carbon
Alkalinity
Hardness
Dioxide Phenolth. Total Calcium Total
mg/L
mg/L
mg/L mg/L mg/L
26.5
34.0
37.0
46.5
49.5
<0.1
<0.1
<0.1
<0.1
2
192
201
202
198
186
196
192
184
216
190
262
254
252
250
246
Air Temp.
Noon
○
○
C
F
23.3
23.3
23.3
23.3
23.3
73.9
73.9
73.9
73.9
73.9
Sky
Previous Day
Precipitation
inches
Partly Cloudy
Partly Cloudy
Partly Cloudy
Partly Cloudy
Partly Cloudy
None
None
None
None
None
Comments:
9