Studying the relationship of chemical and physical parameters on

MEHDI BAGHERI
CLEAN WATER
ENGINEERING - WATERWORKS
Predicting the internal corrosion
in cast iron drinking water mains.
Time
29
DRINKING WATER GOAL
• Source waters from all three watersheds serving the
lower mainland are naturally corrosive.
• Focus of research study was to look at the chemical &
physical parameters affecting the corrosion rate of water
mains in the City, specifically cast iron.
Non-Corrosive water
Corrosive water
30
MAIN DELIVERABLES
1. Developing predictive models to assess the water
potential for corrosion and iron concentration level
2. Providing a visual user-friendly computational tool to
consistently monitor the water corrosivity with minimum
input requirement
The City can integrate these deliverables to prioritize
proactive actions in drinking water mains
31
MODELING SOFTWARE – WATER CORROSION ANALYZER
32
SAMPLE ANALYSIS RESULTS
Corrosivity study of the water
71
(Capilano + Seymour + Coquitlam)
68
79
69
75
44
76
69
90
76
88
84
65
81
127
76
27
34
69
69
73
40
City of Vancouver
89
24
35
23
33
34
74
70
36
70
26
408E (34th)
25
38
100
26
Prediction Map
13.1 – 13.6
13.6 – 14.1
14.1 – 14.6
14.6 – 15
Water pressure zones
22
28
Ryznar Corrosivity index (round 2)
12.7 – 13.1
104
74
30
2869W (KE)
Exp. Iron Level (ppb)
1
10
50
39
82
73
48
76
27
33
31
27
30
24
33