Water Quality Index
School: Rock Valley Community School in Rock Valley, Iowa
Date: Time: 10/12/99
Water Conditions: Low and Fairly Clear
Weather Conditions: Warm and pleasant
Air Temperature: degrees centigrade 20.2 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 11.14
% Sat 100
Q-Value 99
Weighing Factor 0.17
Total % 16.83
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Test 2
Fecal Coliform
colonies/100mL 39
Q-Value 51
Weighing factor 0.16
Total % 8.16
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Test 3
pH
units 8.7
Q-Value 65
Weighing factor 0.11
Total % 7.15
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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 2.5 degrees centigrade
Temp (site1) degrees centigrade 13.8
Temp (site 2) degrees centigrade 16.3
T= degrees centigrade
Q-Value 85
Weighing Factor 0.10
Total % 8.5
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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 13.2
Q-Value 47
Weighilng Factor 0.10
Total % 4.7
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Test 8
Turbidity
meters feet 3 feet
Q-Value 76
Weighing Factor 0.08
Total % 6.08
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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 % 63.29 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