. Bulletin. Natural history; Natural history. November, 1954 Bennett: Largemouth Bass in Ridge Lake 225 of runoff water flowing into the lake. After large rains, this exchange of water is extensive. Most of the runoff water, when warmer than the bottom water, flows from the upper end of the lake to- ward the lower end at surface or near- surface levels. The bottom water is re- placed by water from strata lying imme- diately above; the lowest and coldest lay- ers are lost through the tower spillway. The magnitude of change (increase) in the temperature and dissolved oxygen con- tent of waters i
. Bulletin. Natural history; Natural history. November, 1954 Bennett: Largemouth Bass in Ridge Lake 225 of runoff water flowing into the lake. After large rains, this exchange of water is extensive. Most of the runoff water, when warmer than the bottom water, flows from the upper end of the lake to- ward the lower end at surface or near- surface levels. The bottom water is re- placed by water from strata lying imme- diately above; the lowest and coldest lay- ers are lost through the tower spillway. The magnitude of change (increase) in the temperature and dissolved oxygen con- tent of waters in the bottom strata of the lake following a period of rainfall is de- pendent upon the volume of runoff water draining into the lake from the watershed. When the volume of runoff water is great enough to exceed the capacity of the tower spillway and raise the lake level above the crest of the surface spillway, the water discharge from Ridge Lake becomes a combination of surface water and bot- tom water. In 1942, persistent thermal stratifica- tion of Ridge Lake, characteristic of the warm seasons, began on April 4, figs. 5 and 6. Prior to this date the lake ap- peared to be thermally stratified for short periods; in each of these periods, the strati- fication was broken up by cold weather, which usually was accompanied by heavy rainfall. Annually, during the period of summer thermal stratification. Ridge Lake shows a surface layer of warm water (epilim- nion) of 3 to 5 feet in thickness. In the thermocline, the layer of water below the epilimnion, the temperatures gradu- ally become lower toward the bottom. The thermocline may show a temperature gradient of 10 to 18 degrees F. within a perpendicular distance of only 18 feet. No indication is given of a hypolimnion, or stratum of water of uniform tempera- ture lying directly above the lake bottom. Early in April, 1942, the temperature of the water at a depth of 18 feet was degrees F., while the temperature of the water at t
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