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<br />~ <br /><:"0 <br />o <br />-J <br /> <br />Timed irrigation ;uses water <br />elficlently and nianages the <br />water supply. <br /> <br />EPA Region VII <br /> <br />II Prairie Rose Lake, Iowa: Recreational U$es of this 215-acre man- <br />made lake were impaired by eutrophication and a 19 percent los$ of lake <br />volume resulting from sediment deposition between 1971 and 1 $80. The <br />project achieved a high rate of BMP implementation, primarily timages, <br />because water quality objectives were clear, farmers recognized the need <br />to control erosion to save the lake, and the practices were attractive totne <br />farmers. <br /> <br />II Long Pine Creek, Nebraska: The trout fishery in Long Pine Creek is <br />impaired by high sediment loadings derived from streambank erosion and <br />irrigation discharge. Agricultural, domestic, and municipal use!! of the <br />ground-water, supply are impaired by high nitrate (5-10 percent of <br />sampled wells exceed the drinking water standard) and pesticide levels <br />resulting from fertilizer and pesticide usage. Irrigation water management <br />that includes tailwater recovery is being emphasized to help cOntrol the <br />sediment problem. Fertilizer and pesticide management are bein0 imple- <br />mented through an Extension Service-sponsored producer association. <br />The association promotes deep soil sampling to use nitrogen deep in the <br />soil profile and pest scouting to tailor pesticide use to need. <br /> <br />EPA Region VIII <br /> <br />II Oakwood Lakes-Poinsett. South Dakota: This area, which overlies a <br />portion of an aquifer used as a source of water for a third of the" state's' <br />population, experiences nitrate concentrations exceeding 10 mg/L in 25 <br />percent of the wells sampled. Nutrients and fecal coliforms are d(jlivered <br />to the area's lakes from cropland and feedlots, limiting the recreational <br />use for many citizens in eastern South Dakota. Conservation tille,ge has <br />been used on 70 percent of the targeted area, and fertilizer and pesticide <br />management on 60 percent. A limited number of animal waste systems' <br />have been installed. <br /> <br />, > <br />, <br />-;J <br /> <br /> <br /> <br /> <br />t <br />~ <br /> <br />~~ <br />'" <br />- -,i <br />.,~ <br />.,~ <br />~ <br /> <br />16 <br /> <br />)[ <br />, <br /> <br />'. . <br />,- -< <br />