Lake Murray Dam flow recommendations for Congaree River striped
Transcript of Lake Murray Dam flow recommendations for Congaree River striped
Lake Murray Dam flows and striped bass spawning in Congaree River
Objective
• Consider Congaree River striped bass flow needs in Lake Murray dam license
– Importance
– Biological needs
– Affect of Flow and Temperature
• i.e. it is ‘under the influence’ of the dam
– DNR recommendation
– Questions/Discussion
LakeMurray
LakeWateree
LowerSaluda
River LakeMarion
LakeMoultrie
Importance of Striped Bass
• State Fish of SC
• Initial inland population
• Aquaculture developed
• Economic, recreational -$260 million
• Representative migratory species
• Well-studied
• Santee-Cooper population collapse
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> 2 years old
Total catch
Striped Bass Abundance
18” 5/day
21”
5/acre 15/acre
4/1/06 8/1/06 12/1/06 4/1/07 8/1/07
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Syste
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Cong-Wat Confluence
Sal-Broad Confluence
Pinopolis Dam
Diversion Canal
Cong-Wat Confluence
Sal-Broad Confluence
Pinopolis Dam
Diversion Canal
Watere River
Cooper River
Santee River
Broad River
Saluda River
Congaree River
Lake Marion
Lake Moultrie
• > 80% of spawning in Congaree River
• Most spawning from CNP to I-77
•Peak spawning in April through mid-May
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Date - where '1' is March 1 and '92' is May 31.
Broad
Sal Cola
Sal Dam
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Average April discharge (cfs)
Average LSR contribution
• LSR @ Cola, 1926-2007
– Mean annual flow = 2,749 cfs
• Congaree R. @ Cola, 1956-2007
– Mean annual flow = 8,872 cfs
• By subtraction, mean flow in Broad = 6,123 cfs
• LSR supplies, on average, 31% of Congaree River flow
• LSR mean flow is 45% of Broad’s mean flow
DNR recommendation
• Period of concern is April 1 through May 10
• Assume base minimum flow is 1,300 cfs
• No flow augmentation when Broad > 7,700
• On a continuous basis each ‘day’, release into LSR– 45% of previous days flow within Broad, OR
– the release needed to reach 9,000 cfs in Congaree (whichever is lower)
• No augmentation needed when Broad < 2,700
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Flow, cfs
Broad R. flow
Lower Saluda flow
Congaree R. flow