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Table 3

Montana-Tenant modified method for determining the environmental flows based on the percentage of annual river flow average (CIWP 2014)

TargetThe percentage of annual river flow average (%)
Spring – SummerAutumn – Winter
River flow
Ecosystem conditions 
60–100
Percentage of flow required to maintain ecosystem conditions 
60–100
Survival of river conditions 
Excellent 60 40 
Very good 50 30 
Good 40 20 
Medium 30 10 
Weak 10 10 
Very destructive 0–10 <10 
TargetThe percentage of annual river flow average (%)
Spring – SummerAutumn – Winter
River flow
Ecosystem conditions 
60–100
Percentage of flow required to maintain ecosystem conditions 
60–100
Survival of river conditions 
Excellent 60 40 
Very good 50 30 
Good 40 20 
Medium 30 10 
Weak 10 10 
Very destructive 0–10 <10 
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