Water Quality Index
School: Rock Valley Community School in Rock Valley, Iowa
Date: Time: 9/28/99
Water Conditions: Low and Fairly Clear
Weather Conditions: Sunny and Cold
Air Temperature: degrees centigrade 12.6 degrees centrigrade
Flow rate: meters/second
River/Stream: Rock River
River Mile Marker:
Location: Rock Valley, Iowa
Latitude deg. min. sec.
Longitude deg. min. sec.
Site: Boat Ramp
Site Location or Address: North Edge of Rock Valley
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Test 1
Dissolved Oxygen
DOday1 mg/L 13
% Sat 120
Q-Value 90
Weighing Factor 0.17
Total % 15.3
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Test 2
Fecal Coliform
colonies/100mL 41
Q-Value 54
Weighing factor 0.16
Total % 8.64
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Test 3
pH
units 7.8
Q-Value 82
Weighing factor 0.11
Total % 9.02
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Test 4
BOD Did not do.
DOdays mg/L DOday1-DOday5 mg/L
Q-Value
Weighing factor 0.11
Total %
Test 5
Temperature Change 3.2 degrees centigrade
Temp (site1) degrees centigrade 14
Temp (site 2) degrees centigrade 17.2
T= degrees centigrade
Q-Value 87
Weighing Factor 0.10
Total % 8.7
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Test 6
Phosphate
mg/L .12
Q-Value 97
Weighing Factor 0.10
Total % 9.7
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Test 7
Nitrate
mg/L 8.8
Q-Value 53
Weighilng Factor 0.10
Total % 5.3
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Test 8
Turbidity
meters feet 2 feet
Q-Value 70
Weighing Factor 0.08
Total % 5.6
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Test 9
Total Solids
mg/L 500
Q-Value 31
Weighting Factor 0.07
Total % 2.17
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OVERALL WATER QUALITY INDEX % 64.43 without BOD Test
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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