Research Article

Suitable Environmental Flow Release Criteria for Both Human and Riverine Ecosystems: Accounting for the Uncertainty of Flows

Table 1

Hydrological alterations corresponding to the optimal e-flow release criterion under flow uncertainty.

IHA groupIHAValues

Group 1: magnitude of monthly flow conditionsMean flow in January1
Mean flow in February1
Mean flow in March1
Mean flow in April1
Mean flow in May1
Mean flow in June1
Mean flow in July0.71
Mean flow in August0.68
Mean flow in September0.82
Mean flow in October1
Mean flow in November1
Mean flow in December1

Group 2: magnitude and duration of annual extreme flow conditions and base flow conditionAnnual 1-day minimum flow0.11
Annual 1-day maximum flow0.22
Annual 3-day minimum flow0.17
Annual 3-day maximum flow0
Annual 7-day minimum flow0.02
Annual 7-day maximum flow0.56
Annual 30-day minimum flow0.11
Annual 30-day maximum flow0.84
Annual 90-day minimum flow1
Annual 90-day maximum flow1
7-day minimum flow divided by mean flow in each year0.78

Group 3: timing of annual extreme flow conditionsDate of annual 1-day maximum flow0.11
Date of annual 1-day minimum flow0.12

Group 4: frequency and duration of high and low pulsesNumber of high pulses in each year0.13
Number of low pulses in each year0.3
Mean duration of high pulse in each year0.02
Mean duration of low pulse in each year0.01

Group 5: rate and frequency of flow condition changesMean of all positive differences between consecutive daily flows0.45
Mean of all negative differences between consecutive daily flows0.45
Number of flow reversals1