Water Quality Index - Sergeant Bluff-Lutton Middle School
Big Sioux River - 4/28/98
School: Sergeant Bluff-Luton Middle School
Date: April 28, 1998 Time: 12:30 pm
Water Conditions: very muddy, 14 *C
Weather Conditions: clear and warm but preceeding days had been veryrainy
Air Temperature: degrees centigrade 16
Flow rate: meters/second 2m/s
River/Stream: Big Sioux River
River Mile Marker:
Location: Sioux City, Iowa 1 mile north of merging with the Missouri
Latitude deg. min. sec.
Longitude deg. min. sec.
Site: Sioux City Boat Club
Site Location or Address:
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Test 1
Dissolved Oxygen
DOday1 mg/L 9
% Sat 91.2%
Q-Value 95
Weighing Factor 0.17
Total % 16.15
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Test 2
Fecal Coliform
colonies/100mL 1000
Q-Value 22
Weighing factor 0.16
Total % 3.52
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Test 3
pH
units 8
Q-Value 82
Weighing factor 0.11
Total % 9.02
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Test 4
BOD
DOdays mg/L DOday1-DOday5 mg/L
Q-Value
Weighing factor 0.11
Total %
Test 5
Temperature Change
Temp (site1) degrees centigrade
Temp (site 2) degrees centigrade
T= degrees centigrade
Q-Value
Weighing Factor 0.10
Total %
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Test 6
Phosphate
mg/L .17
Q-Value 99
Weighing Factor 0.10
Total % 9.9
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Test 7
Nitrate mg/L .44
Q-Value 98
Weighilng Factor 0.10
Total % 9.8
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Test 8
Turbidity meters feet 1 inch
Q-Value 17
Weighing Factor 0.08
Total % 1.87
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Test 9
Total Solids
mg/L
Q-Value
Weighilng Factor 0.07
Total % - - - - - - - - - - - - - - - - -
OVERALL WATER QUALITY INDEX % 50.26 without 2 tests
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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