Statistical Summary of Daily Values Data and Trend Analysis of Dissolved-Solids Data at National Stream Quality Accounting Network (NASQAN) Stations Page: 74
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TABLE 5.--STATISTICAL SUMMARY OF DAILY VALUES DATA AND TREND ANALYSIS OF
DISSOLVED SOLIDS DATA COLLECTED AT NASQAN STATIONS IN CALIFORNIA--CONTINUED
STATION NUMBER: 11447650 STATION NAME AND LOCATION: SACRAMENTO RIVER AT FREEPORT, CALIF.
LATITUDE-LONGITUDE: 382720 1213007
PERCENT OF SAMPLES IN WHICH VALUES
DESCRIPTIVE STATISTICS WERE LESS THAN OR EQUAL TO THOSE SHOWN
SAMPLE STANDARD MEDIAN
PARAMETER SIZE MAXIMUM MINIMUM MEAN DEVIATION 95 75 50 25 5
TEMPERATURE (DEG C) MEAN 435 23.00 4.50 13.97 5.51 22.26 19.80 12.20 9.10 6.78
STREAMFLOW (CFS) MEAN 731 94600.00 8630.00 21229.81 16088.94 65919.92 20000.00 15600.00 13100.00 10160.00
CONDUCTANCE (UMHOS) MEAN 463 203.00 64.00 128.97 28.74 187.00 142.00 126.00 108.00 89.20
PERIOD OF RECORD ON WHICH STATISTICAL
CALCULATIONS WERE BASED FOR EACH PARAMETER
PARAMETER PERIOD OF RECORD
TEMPERATURE (DEG C) MEAN OCT 1972 TO FEB 1974
STREAMFLOW (CFS) MEAN OCT 1979 TO SEPT 1981
CONDUCTANCE (UMHOS) MEAN FEB 1974 TO JUL 1975
DISSOLVED SOLIDS FOR THIS STATION MAY BE ESTIMATED FROM SPECIFIC CONDUCTANCE
USING THE FOLLOWING EQUATION:
DISSOLVED SOLIDS (MG/L) = 20.03+(0.5334 X SPECIFIC CONDUCTANCE)
R SQUARE FOR THE ABOVE EQUATION IS 0.802 AND THE STANDARD ERROR OF ESTIMATE IS 8.6 MG/L.
THE REGRESSION BETWEEN THE ADJUSTED RESIDUALS CONCENTRATION AND TIME WAS NOT SIGNIFICANT AT
THE 95-PERCENT CONFIDENCE LEVEL, INDICATING NO TREND COULD BE DETECTED IN DISSOLVED-SOLIDS
CONCENTRATIONS WITH TIME. A PLOT OF THE ADJUSTED RESIDUALS CONCENTRATIONS AND THE PREDICTED
REGRESSION EQUATION IS SHOWN BELOW:
PLOT OF ADJUSTED RESIDUAL CONCENTRATIONS VERSUS DECTIME
PLOT OF ADJC*DECTIME SYMBOL USED IS 0
PLOT OF PR*DECTIME SYMBOL [TSED IS *
140 +
0
130 +
Al
D
U 120 +
S 0
T 0
E
D
110+ 0 0
R 0
E
S 0
0 0
D 100+ 0 0 ** **
U *[* 1* * ** * * ** ** *
A * * * * * * * 0
L * *
* * *
C 90+ 0 0
0 I0 0
N
C 0 0
0 0
80 +
M
G 0
/ 0 0 0
L 70 +
60 +
50 +
1977.00 1977.40 1977.80 1978.20 1978.60 1979.00 1979.40 1979.80 1980.20 1980.60
TIME, IN YEARS
-74-
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Wells, Frank C. & Schertz, Terry L. Statistical Summary of Daily Values Data and Trend Analysis of Dissolved-Solids Data at National Stream Quality Accounting Network (NASQAN) Stations, report, 1983; United States. (https://digital.library.unt.edu/ark:/67531/metadc968428/m1/94/: accessed April 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.