20080868 Ver 2_Huddles Cut Monitoring Discussion Notes_20191104

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Part 1: How well does a hand held YSI unit compare in accuracy with
salinity reads from AquaTROLLs at Huddles Cut?
Note: Salinity data was highest at Huddles Cut AquaTROLLs from 2011 to 2013 so the data set
from 2012 was used to examine the higher salinity among upstream AquaTROLLs to test the
accuracy of instruments. AquaTROLL salinity used for comparison was taken same time as YSI
salinity -instant read of AquaTROLL is part of normal download procedure.
Figure 1: Sample year 2012 used to show accuracy of salinity reads between YSI and AquaTROLL at HS1.
Figure 2: Sample year 2012 used to show accuracy of salinity reads between YSI and AquaTROLL at HS1.
Huddles Cut and Jacobs Creek AquaTROLL meeting with PCS/CZR/USACE/NCDWR
4 November 2019
Page 1

Figure 3: Sample year 2012 used to show accuracy of salinity reads between YSI and AquaTROLL at HS2.
Figure 4: Sample year 2012 used to show accuracy of salinity reads between YSI and AquaTROLL at HS2.
Huddles Cut and Jacobs Creek AquaTROLL meeting with PCS/CZR/USACE/NCDWR
4 November 2019
Page 2

Figure 5: Sample year 2012 used to show accuracy of salinity reads between YSI and AquaTROLL at HS3.
Figure 6: Sample year 2012 used to show accuracy of salinity reads between YSI and AquaTROLL at HS3.
Part 1 Summary:
The YSI is a reliable alternative to the AquaTROLL because its reads are accurate during site
visits.
Allowing a biologist to deploy the YSI during site visits would ensure that the salinity is being
read from a legitimate water column. A biologist could produce 24 accurate reads with the
ability to reduce errors encountered by changes in depth and probes affected by environmental
conditions (sediment fluff, algae, debris, etc.).
Huddles Cut and Jacobs Creek AquaTROLL meeting with PCS/CZR/USACE/NCDWR
4 November 2019
Page 3

Part 2: What is the difference in salinity for 5,840 reads per year
(every 1.5hr/day) compared to 24 reads per year (twice a month on
1st and 15th) at Huddles Cut and Jacobs Creek?
• HSI- Salinity reads taken every 1.5 hours averaged annually
• HSI*- Salinity reads taken from the 1" and 15"of each month then averaged annually
Figure 7: Comparison of AquaTROLL salinity reads every 1.5 hours (HSI) and two salinity reads per
month (HSI*) from AquaTROLL at HSI.
Figure 8: Correlation of AquaTROLL salinity reads every 1.5 hours and two salinity reads per month from
AquaTROLL at HS1.
Huddles Cut and Jacobs Creek AquaTROLL meeting with PCS/CZR/USACE/NCDWR
4 November 2019
Page 4

Figure 9: Comparison of AquaTROLL salinity reads every 1.5 hours (HS2) and two salinity reads per
Figure 10: Correlation of AquaTROLL salinity reads every 1.5 hours and two salinity reads per month
from AquaTROLL at HS2.
Huddles Cut and Jacobs Creek AquaTROLL meeting with PCS/CZR/USACE/NCDWR
4 November 2019
Page 5

Figure 11: Comparison of AquaTROLL salinity reads every 1.5 hours (HS3) and two salinity reads per
month (HS3*) from AquaTROLL at HS3.
Figure 12: Correlation of AquaTROLL salinity reads every 1.5 hours and two salinity reads per month
from AquaTROLL at HS3.
Huddles Cut and Jacobs Creek AquaTROLL meeting with PCS/CZR/USACE/NCDWR
4 November 2019
Page 6

Figure 13: Comparison of AquaTROLL salinity reads every 1.5 hours (1CB51) and two salinity reads per
month (1CBS1*) from AquaTROLL at JCBSI.
Figure 14: Correlation of AquaTROLL salinity reads every 1.5 hours and two salinity reads per month
from AquaTROLL at JCBS1.
Huddles Cut and Jacobs Creek AquaTROLL meeting with PCS/CZR/USACE/NCDWR
4 November 2019
Page 7

6.4
6.41
4.97 4.87
H51 HS1*
HS1
H51*
Pre Pre
Post
Post
Pre and Post Means
6.96
6.83
4.82 4.87
HS2 HS2*
HS2
HS2*
Pre Pre
Post
Post
8.47 8.57 8.46 8.38
HS3 HS3* H53 H53*
Pre Pre Post Post
Figure 15: Comparison of annual salinity means from Huddles Cut AquaTROLLs (all data from every 1.5
hr reads) and annual salinity means from twice per month reads only (approximately 1" and 15" only =
*) from Huddles Cut AquaTROLL data 1999-July 2019.
JCBS1 Pre and Post Salinity Means
12 11.24 11.31
10
8 7.02 7.09
6
4
2
0
JCBS3 Pre JCBS3 Pre* JCBS3 Post JCBS3 Post*
Figure 16: Comparison of annual salinity means from Jacobs upstream AquaTROLL (all data from every
1.5 hour reads) and annual salinity means from twice per month reads only (1't and 15"only = *) from
Jacobs upstream AquaTROLL data July 2011-December 2018.
Part 2 Summary:
• When comparing two reads per month to annual means including salinity readings every 1.5
hours, it appears that using two reads per month is a potential alternative.
Huddles Cut and Jacobs Creek AquaTROLL meeting with PCS/CZR/USACE/NCDWR
4 November 2019
Page 8

Pg-,� cry CW& -•f
HS1 Aqua TROLL loss (damaged conductivity sensor due to low water) and number of days with at least one
least one dry read. Note: in some conditions, sensor is "dry" but water may be present beneath it
HS1
2015
2016
2017
2018
20198
MONTH
# ATs
# ATs
# ATs
# ATs
# ATs
# days
# days
# days
# days
# days
Lost
Lost
Lost
Lost
Lost
JAN
13
4
1
0
18
1
15
FEB
18
2
3
28
1
4
MAR
11
23
17
1
1 10
12
APR
22
15
17
15
16
MAY
19
14
1
10
1
19
1
21
JUN
21
1
26
23
0
15
JUL
21
1
23
1
29
1
11
1
4
AUG
1
7
16
1
17
5
6
SEP
2
1
8
1
20
0
OCT
1
5
2
11
1
16
1
25
1
NOV
2
0
1
25
1
4
DEC
5
0
27
0
Totals
2
146
5
142
6
185
5
155
5
93
a data through 30 Sept 2019 (nine months) and total Aqua TROLLs lost are based on ten months
bold = the two highest number of "dry" days for each year
HS2 Aqua TROLL loss (damaged conductivity sensor due to low water) and number of days with at least one
least one dry read. Note: in some conditions, sensor is "dry" but water may be present beneath it
HS2
MONTH
2O15
2016
2017
2018
20198
# ATs Lost
# days
#ATs Lost
#days
# ATs Lost
# days
# ATs Lost
# days
# ATs Lost
# days
JAN
14
1
0
29
21
FEB
3
4
0
28
1
5
MAR
1
2
1
16
4
19
18
APR
14
0
23
21
20
MAY
15
0
18
27
1
27
JUN
17
0
1
5
1
18
25
JUL
11
0
1
25
1
16
1
13
AUG
1
2
1
4
1
21
2
22
20
SEP
1
7
1
17
6
30
1
0
OCT
1
0
19
1
21
NOV
2
0
25
8
DEC
1
5
0
30
7
Totalsj
4
1 93
3
42
3
176
5
246
4
149
a data through 30 Spet 2019 (nine months) and total Aqua TROLLs lost are based on ten months
bold = the two highest number of "dry' days for each year

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