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City of Boulder/USGS Water Quality Monitoring
Diurnal Variations of Water Quality Parameters in Boulder Creek

Data obtained from 1986 and 1987, Aquatic and Wetland Consultants, Inc. (AWC) diurnal (24-hour) sampling study of Boulder Creek and Coal Creek water quality.


hour DO pH temp (stream) SC temp (air) discharge (ft3/sec)
Feb-05-87            
4 8.6 7.5 3.2 110 -10 65.2
5 8.2 7.5 2.7 164 -11 55
6 9.8 7.6 2 157 -12 43
7 10.6 7.6 1.5 136 -12 39
8 10.6 7.7 1.5 146 -6 33
9 11.2 7.6 1.5 152 -4 29
10 12 7.7 2.2 147 -2 27
11 12.4 7.9 3.4 148 0 27
12 12.6 7.9 4 174 5 27
13 12.6 8.2 6.2 187 6 41
14 12.6 8.5 7.2 209 10 45
15 12.3 8.8 7.7 229 9 39
16 12.2 8.3 7.8 223 8 39
17 11.6 8.3 7.6 237 6 39
18 11 8.2 7.4 229 4 39
19 11 8.1 7.2 216 -2 39
20 9 8.1 6.1 275 -4 41
21 9 8 5.4 282 -6 43
22 9 8.1 5 253 -6 45
23 9 8.2 4.5 245 -6 45
24 9 8 4 257 -7 47
25 9 8 4 268 -8 63.1
26 8.8 7.8 3.5 259 -10 133.8
27 8.8 7.7 3.5 258 -10 136.7

Chart DISCHARGE

Chart SPECIFIC CONDUCTANCE

Chart FIGURE 1:  AIR TEMPERATURE

Chart FIGURE 4:  pH

Chart FIGURE 3:  DISSOLVED OXYGEN

Chart FIGURE 2:  WATER TEMPERATURE


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Last Page Update - Wednesday December 28, 2005