bee lake water quality monitor data summary
DESCRIPTION
Bee Lake Water Quality Monitor Data Summary. Period of record: 10-1-05 to 2/19/07. Bee Lake Monitoring Station. Located mid-bridge at Thornton In service since summer of 2005 Continuous, real-time monitor Stage Temperature Rainfall Specific conductance Turbidity. - PowerPoint PPT PresentationTRANSCRIPT
U.S. Department of the InteriorU.S. Geological Survey
Bee Lake Water Quality Monitor Data Summary
Period of record: 10-1-05 to 2/19/07
Bee Lake Monitoring Station
Located mid-bridge at Thornton In service since summer of 2005 Continuous, real-time monitor
Stage Temperature Rainfall Specific conductance Turbidity
Bee Lake looking north from bridge at Thornton
Bee Lake real-time monitor web page:http://waterdata.usgs.gov/ms/nwis/uv/?site_no=330359090194135&PARAmeter_cd=00065,00060
Summary Information
Figures and table are based on daily mean data (or daily totals for rainfall)
Figure 1 – Stage, rainfall, turbidity; 10/1/05 to 2/19/07
Figure 2 – Stage, rainfall, specific conductance, temperature; 10/1/05 to 2/19/07
Table 1 – Summary statistics comparing data for period 10/1/05-2/19/06 to data for period 10/1/06-2/19/07
La
ke
Sta
ge
, fe
et
0
2
4
6
8
10
12
Tu
rbid
ity,
FN
U
0
20
40
60
80
100
120
9/1/2005 1/1/2006 5/1/2006 9/1/2006 1/1/2007
Ra
infa
ll,
inc
he
s
0
2
4
6
8
10
Figure 1. Stage, turbidity, and rainfall at Bee Lake monitoring station, 10/1/05 to 2/19/07
Figure 1 observations
Overall decrease in turbidity for 10/1/05 – 2/19/07: BMPs or weather? Antecedent stage was lower prior to winter 2006-2007 than
winter 2005-2006 Dry summer 2006; drought conditions
Storm of 10/06 7 in. rainfall event Turbidity and stage lower than previous year’s storms
Storms 10/2006 – 2/2007 Stage peaks are smaller and have a longer duration than
previous year Lower turbidities than previous year
Sta
ge
, fe
et
0
2
4
6
8
10
12
14
16
18
Sp
ec
ific
co
nd
uc
tan
ce
, m
icro
sie
me
ns
pe
r c
en
tim
ete
r
0
20
40
60
80
100
120
140
160
180
Te
mp
era
ture
, d
eg
ree
s C
els
ius
0
20
40
60
80
100
120
9/1/2005 1/1/2006 5/1/2006 9/1/2006 1/1/2007
Ra
infa
ll,
inc
he
s
0
2
4
6
8
10
Figure 2. Stage, specific conductance, temperature, and rainfall at Bee Lake monitoring station, 10/1/05 to 2/19/07
Figure 2 observations
Interaction between specific conductance and rainfall are typical and expected Higher specific conductance with lower stage and
infrequent rainfall Rainfall events immediately drop temperature and
specific conductance During drought conditions, specific conductance
goes up possibly indicating ground water infiltration
10/1/05 - 2/19/06 10/1/06 - 2/19/07
Data Set
Number of missing
data Minimum Maximum Median Mean
Number of missing
data Minimum Maximum Median Mean
Stage 0/142 6.1 10.7 6.6 7.0 0/142 5.0 9.3 7.4 7.4
Rainfall 18/142 0.0 2.4 0.0 0.1 2/142 0.0 7.1 0.0 0.2
Temperature 1/142 7.2 27.5 12.6 14.3 0/142 6.8 27.8 12.4 13.5
Specific Conductance 10/142 73.4 88.1 82.6 82.5 0/142 71.1 104.5 76.8 78.6
Turbidity 44/142 12.8 70.0 21.0 22.9 51/142 0.1 49.1 4.1 7.2
Table 1. Summary statistics comparing data for period 10/1/05-2/19/06 to data for period 10/1/06-2/19/07
Rainfall totals for 10/1/05-2/19/06: 17.03 inches
Rainfall totals for 10/1/06-2/19/07: 23.25 inches
Table 1 observations
Time periods were selected to cover fall and winter months during which intense storms are expected
Summary statistics for stage, temperature, and specific conductance are similar for both time periods
Rainfall maximum and totals are higher for 2006-07
All turbidity statistics are lower for 2006-07
Summary
Stage peaks are smaller and have a longer duration for storms in 2006-07
Turbidity was lower for 2006-07 in spite of more rainfall and one intense rainfall event during 10/2006
Possible ground water infiltration during summer drought periods
Data indicate that changes have occurred in Bee Lake basin resulting in lower turbidity in the lake
Still too early to tell if changes were caused by BMPs or by drought conditions during summer 2006
Future Activities
Continue monitoring lake conditions During 2007:
One new sampling sites installed just below large area of BMP-treated land
One new sampling site located at lake outlet
Three to four years of sampling at all locations
Summary report will be completed at the end of sampling period