Dissolved
Oxygen refers to the amount of oxygen dissolved in the
water. DO of the water may came from the atmosphere,
natural or artificial aeration and photosynthesis of
aquatic plants. If water contaminated by organic matter,
it cause the reduction or even shortage of oxygen.
Primary
public water supply contain more than 6.5mg/L.
DO
Testing Result at Plum Tree Creek
Observation
Point
1
2
3
4
5
6
7
8
9
10
11
12
13
Low
Flow
10.8
9.5
6.8
5.6
4.6
5.6
5.6
5.7
3.1
2.3
2.5
1.3
1.2
High
Flow
11.2
9.8
7.2
6.3
5.4
6.3
6.3
5.7
3.2
3
2.6
1.4
1.3
DO
Statistical
Chart of Plum Tree Creek
Analysis：
Origin-pollution
free
Headstream-mild
pollution
Midstream-extreme
mild polluted
Downstream-serious
polluted
There
are significant differences at origin, upstream and
midstream between high and low flow.
Introduction
