Table 3. Unified flow recommendation’s low flows for each month, for dry, normal, and wet years. Flow rates are cubic meters per second (m3/s).
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Year Type |
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Month |
Dry |
Normal |
Wet |
Example flow-ecology links |
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January |
40–50 |
50–65 |
65–80 |
Jan. wet-year range considered “optimal” for transportation
Beaches used by reptiles for nesting |
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February |
30–35 |
35–50 |
55–65 |
Beaches used by reptiles for nesting |
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March |
30 |
30–40 |
40–45 |
Flows below 30 m3/s make transportation very difficult
Cichlid fish spawning |
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April |
30 |
30 |
30 |
Cichlid fish spawning |
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May |
30 |
30 |
30–35 |
Cichlid fish spawning |
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June |
30–35 |
35–60 |
70–90 |
Cues for spawning migratory species |
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July |
45–55 |
60–90 |
125–135 |
Cues for spawning migratory species |
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August |
45–70 |
80–115 |
120–150 |
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September |
60–80 |
80–120 |
130–145 |
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October |
90–100 |
100–130 |
130–145 |
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November |
60–75 |
80–115 |
120–140 |
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December |
45–60 |
65–85 |
85–120 |
Upstream migrations of juvenile migratory species may begin |
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