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17 Environmental Flow Definition and Management: A Case Study …
Table 17.8
Summary of flow requirements for Reach 3
Flow
component
Timing
Months
Q
PEAK (m 3
/s)
Q
DAILY (m 3
/s)
Frequency (per
year)
Duration
Rise/fall target (max) m 3
/s a
Low flow
Low flow
season
Oct–Jan
6.8
6.8
Continuous or
less than if
natural
Low flow
Low flow
season
Feb–Mar
17.3
17.3
Continuous or
less than if
natural
High flow
High flow
season
Apr–Sep
22.2
22.2
Continuous or
less than if
natural
Low flow
pulse
Low flow
season
Oct–Mar
96
96
4
4 consecutive days +38(+78)/−25(−45)
High flow
pulse
High flow
season
Apr–Sep
146
146
6
7 consecutive days +61(+120)/−47(−80)
Bankfull
Anytime
Anytime
1289
948
1.3
1 day peak;
achieve Q
PEAK
and Q
DAILY on
day of peak
+453(+809)/−499(−801)
a
Rate is the maximum change in discharge that is allowed from one day to the next. Target is a recommended rate change, but maximum can be used (at higher
environmental risk). If allowable rate change exceeds the required event magnitude then discharge can be raised to the event magnitude over one day
Source
WET (2007)
Permission granted by WET project subject to proper citation