Fremantle Port Inner Harbour and Channel ... - Fremantle Ports

Table 4.2
Depth-specific Light Attenuation Coefficient (LAC; m -1 ) Water Quality Trigger Values
based on 10% Minimum Light Requirement (MLR) for Seagrasses
Water Depth
(m)
Zone of Influence
LAC trigger based
on MLR Threshold
Zone of Effect
LAC triggers based on % increase
30% 40% 50%
1 1.000 1.300 1.400 1.500
2 0.500 0.650 0.700 0.750
3 0.333 0.433 0.467 0.500
4 0.250 0.325 0.350 0.375
5 0.200 0.260 0.280 0.300
6 0.167 0.217 0.233 0.250
7 0.143 0.186 0.200 0.214
8 0.125 0.163 0.175 0.188
9 0.111 0.144 0.156 0.167
10 0.100 0.130 0.140 0.150
11 0.091 0.118 0.127 0.136
12 0.083 0.108 0.117 0.125
13 0.077 0.100 0.108 0.115
14 0.071 0.093 0.100 0.107
15 0.067 0.087 0.093 0.100
16 0.063 0.081 0.088 0.094
17 0.059 0.076 0.082 0.088
18 0.056 0.072 0.078 0.083
Table 4.3
Depth-specific Light Attenuation Coefficient (LAC; m -1 ) Water Quality Trigger Values
based on 20% Minimum Light Requirement (MLR) for Corals
Water Depth
(m)
Zone of Influence
LAC trigger based
on MLR Threshold
Zone of Effect
LAC triggers based on % increase
30% 40% 50%
1 0.699 0.9087 0.9786 1.048
2 0.349 0.4537 0.4886 0.524
3 0.233 0.3029 0.3262 0.349
4 0.175 0.2275 0.245 0.262
5 0.140 0.182 0.196 0.210
6 0.116 0.1508 0.1624 0.175
7 0.100 0.13 0.14 0.150
8 0.087 0.1131 0.1218 0.131
9 0.078 0.1014 0.1092 0.116
10 0.070 0.091 0.098 0.105
11 0.064 0.0832 0.0896 0.095
12 0.058 0.0754 0.0812 0.087
Physico-chemical water quality indicators
Water quality triggers for physico-chemical parameters, specifically dissolved oxygen and pH,
adopted as indicators of ecosystem health within MEPAs and HEPAs, are based on
environmental quality criteria developed within the Environmental Quality Criteria Reference
Document for Cockburn Sound (EPA 2005a), as shown in Table 4.4.
Toxicants in water
Water quality triggers for toxicants including metals, organotins, organochlorine pesticides,
and polycyclic aromatic hydrocarbons, adopted as indicators of ecosystem health values
within MEPAs and HEPAs, as shown in Table 4.5, are based on a combination of:
• 99% species protection values for HEPAs (except cobalt which is 95% species
protection), and 90% species protection values for MEPAs, as defined by Table 3.4.1
Oceanica: Fremantle Ports: Inner Harbour and Channel Deepening - Water Quality Monitoring Program 11