Denison Management Releases,
CORPS OF ENGINEERS HUNTINGTON WV HUNTINGTON DISTRICT
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Recent fish kills below two Oklahoma projects revealed the need for a management practice to prevent fish kills associated with low DO. DO concentrations in releases made through flood conduits were aerated to saturation values from anoxic conditions due to the turbulent nature of the release. A high flow rate, short duration conduit release was tested at Denison Dam. A low flow rate, continuous conduit release was tested at Denison, Keystone, and Tenkiller Ferry Dams. A partial epilimnetic release made through the conduit at Denison Dam was also tested. A 10,000 cfs release for 30 minutes was tested to determine if this was a desirable management practice during a fish kill. The downstream DO concentrations were raised from near anoxia to near saturation values almost immediately. Observations during generation periods below Denison and Keystone showed the fishery to be actively feeding even though the DO was less than 3.0 mg1. The lowest DO concentration during nongeneration periods was found to be early morning below Denison and Keystone Dams. A continuous release of 50 cfs through the flood conduits was sufficient to maintain the early morning DO concentrations to near saturation values. A release of 135 cfs was sufficient to increase DO concentrations below Keystone Dam from 48 to 96 saturation in 4 hours.