School: Rock Valley Comm. High School
Date: Time: Feb 2, 2001, 11:30a.m.
Water Conditions: clear
Weather Conditions: cloudy, cold, light snow
Air Temperature: degrees centigrade -15.3
Flow rate: meters/second
River/Stream: Rock River
River Mile Marker:
Location: North Edge Town
Latitude deg. min. sec.
Longitude deg. min. sec.
Site: Rock Valley Block & Tile
Site Location or Address: Rock Valley Iowa
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Test 1
Dissolved Oxygen
DOday1 mg/L 9
% Sat 65
Q-Value 69
Weighing Factor 0.17
Total % 11.73
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Test 2
Fecal Coliform
colonies/100mL 1
Q-Value 97
Weighing factor 0.16
Total % 16.49
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Test 3
pH
units 7.21
Q-Value 93
Weighing factor 0.11
Total % 10.23
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Test 4
BOD
DOdays mg/L DOday1 9mg/l -DOday5 7mg/L
Q-Value 79
Weighing factor 0.11
Total % 8.69
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Test 5
Temperature Change 0
Temp (site1) degrees centigrade 1
Temp (site 2) degrees centigrade 1
T= degrees centigrade
Q-Value 92
Weighing Factor 0.10
Total % 9.2
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Test 6
Phosphate
mg/L .13
Q-Value 95
Weighing Factor 0.10
Total % 9.5
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Test 7
Nitrate
mg/L 26
Q-Value 30
Weighilng Factor 0.10
Total % 3
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Test 8
Turbidity
meters feet 4
Q-Value 87
Weighing Factor 0.08
Total % 6.96
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Test 9
Total Solids
mg/L .79
Q-Value 79
Weighting Factor 0.07
Total % 5.53
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OVERALL WATER QUALITY INDEX % 81.33
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Overall Water Quality Index Quality of Water
90% - 100% Excellent
70% - 90% Good
50% - 70% Medium
25% - 50% Bad
0% - 25% Very bad
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