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<br />'-' <br />(-' <br />~ <br />.(:) <br />cc <br />o <br /> <br />S-Minute Activity Report <br />127th Meeting of AWRBlAC <br />Page 7 <br /> <br />Lake Water Duality Assessment Slzl4y <br /> <br />As part of the Clean Water Act, each state is required to assess the quality of its water on <br />a biennial basis. Surface acres with impaired beneficial uses are to be determined as well <br />as the trophic state of the waterbodies assessed. To fulfill these requirements, the OWRB <br />chose to use remote sensing technology (LANDSAT) in conjunction with lake sampling on <br />the ground. The total lake area assessed or monitored in Oklahoma was 628,796 acres. A <br />total of 147 lakes, which account for 92 percent of the lake surface acres assessed or <br />monitored (581,896 acres), were characterized as having water quality concerns or <br />impairments over some portion of the waterbody. A water quality concern or impairment <br />means that same portion of the lake is not meeting the designated beneficial uses. <br /> <br />Weather Conditions <br /> <br />The three rivers leaving Oklahoma and entering the State of Arkansas which are gaged by <br />the U.S. Geological Survey are the Little River near Horatio (Arkansas), the Red River <br />near Index (Arkansas), and the Arkansas River at Lock & Dam 13 near Van Buren <br />(Arkansas). The total water flow recorded for 1990 was 69,137,000 acre-feet, compared to <br />a fifty-year average annual flow of 34,907,000 acre-feet. The rain also attributed to record <br />lake levels in seven of our major reservoirs (Eufaula, Wister, Arbuckle, Texoma, McGee <br />Creek, Sardis and Hugo). Record flood flows contributed to 55 dam incidents ranging from <br />total failure to major damage at spillways. Rainfall for the first four months of 1991 was <br />approximately an inch below normal, with February and March being two of the driest in <br />recorded history. <br />