St. Louis Post-Dispatch from St. Louis, Missouri • Page 28

6B Dec. 13, 1973 si LOUIS POST-DISPATCH Oxygen Experiments Could Solve Taney como Trout Dilemma outdoors tytimrentenfei valve was opened, the content of the discharge immediately rose above 7 p.p.m. Observers were pleased and for a few days, with the turbines running their normal fall rate of about half speed, things went nicely. Then torrential rains began to fall into the Table Rock watershed. The lake eventually rose almost 10 feet.

The Corps had to begin running all four turbines at top speed to use up the water. The oxygen content of the discharge fell and so the flow of oxygen was increased. The situation was improved but the flow of water was so enormous no degree of control ever was established. At one point last month the Corps was using 100 tons of oxygen a day (at $44.90 a ton). To make the situation worse, warm weather in November delayed the Table Rock turnover (when the temperature is about uniform and the water throughout the lake is able to mix) and so instead of the usual six weeks of crisis the Corps had 10.

Only now is the turnover taking place and the demand for oxygen ending. "All that water really fouled up our plans," said Bill Ed-ens, Corps powerplant superintendent. "We had planned on carrying out a number of experiments designed to determine how much oxygen we need during certain flow rates. But because we had to run full blast the whole fall we weren't able to carry them out. We'll have to do them next fall." "But we think this may be the solution to our problem here." An official with the Missouri Department of Conservation, fish biologist Willis Hanson, agreed that the operation had promise.

"We're hoping the Corps can get things straightened out soon and return the great trout fishing we once had at Taneycomo," he said. gen. They had it delievered in tank trucks, in liquified form under extreme pressure. From a 20O-ton storage tank near-the dam they passed it through a vaporizer to turn it ito a gas and then injected it into the tubes just as they had the compressed air. The experiment began Oct.

16. Water coming through the outlet at the time contained about 3.5 p.p.m. when the oxygen It was a quiet autumn around Table Rock dam this year. Relative quiet, that is. The last two autumns around the huge concrete structure were enough to cause earaches.

The noise came from eight huge air compressors, each twice as large as the kind used by street crews, roaring away in a parking lot. The compressors were supplying air as part of a Corps of Engineers effort to prevent oxygen depletion that was ruining the trout fishery in Lake Taneycomo. The oxygen depletion in recent years has become a chronic problem in the fall at Taneycomo. Taneycomo gets -its water from deep in Table Rock lake that's why it's cold enough to support trout. But in the fall several natural and man-created elements combine to cause the water being drawn through Table Rock dam to be low in the dissolved oxygen that fish must have to survive.

Reading of less than 2 parts per million (p.p.m.) have been taken from the base of the dam in October and November. Trout need 8 to 10 p.p.m. to be comfortable and they may die with less than 5. In 1971 and 1972 the Corps usedthe compressors to inject air into the four intake tubes. This worked to some extent.

The oxygen content in Taneycomo was kept above or near the legal minimum (6 p.p.m.) through most of the fall. But the system was cumbersome and, to say the least, noisy. This year the Corps tried something different pure oxy- Sears SAW1E (BdD (wnu Somms (Cirmffitsimmim 11114 jpcSo TTnnE Sett Prep Basketball Southwest Kansas City 68, Helton 61 Wl.NNETONKA TOURNAMENT (Second Round) Raytown 60. Excelsior Springs 54 Hogan 37, Winnetonka 55 RAYTOWN' SOUTH TOI'RNAMEN'T North Kansas Citv 45, Lee's Summit 42 Ruskln 49, St. Josenh Central 40 BOONV1M.E TOURNAMENT California 84.

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