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<br />I <br />II <br />I '0 <br />N <br /> ~ <br />I -oJ <br />~ <br />I <br />I., <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />increased funoff also augment low flows. Wilson Creek and its <br />tributaries constitute the main storm water sewer system of the <br />City of Springfield.12 <br /> <br />The initial "flush" of stormwater runoff is the largest threat <br />to aquatic life. Water temperatures and toxic chemical concentra- <br />tions are high, while oxygen content, is extremely low. "All pre- <br />vious major fish kills of record occurred during periods of low <br />flow in the James River, when thunderstorms oVer the City of <br />Springfield located in the upper Wilson Creek basin produced a <br />rise in Wilson Creek not accompanied by a rise in the James <br />River. ,,13 <br /> <br />Bypasses of the sewage treatment plant occur during moderate <br />and heavy rains due to infiltration and etormwater connections to <br />sanitary sewers. The Southwest Sewage Treatment Plant is designed <br />in such a way that flows in excess of 12 million gallons a day are <br />bypassed directly to the polishing lagoon and are not disinfected <br />before being released to Wilson Creek. Wet weather flows in excess <br />of 80 million gallons per day have been measured. (A new treat- <br />ment plant is scheduled to begin service in September of 1977, <br />with a capacity of 42 million gallons per day. The new plant, <br />together with the Southwest Plant, will still not be able to <br />stop all bypasses.)14 <br /> <br />The central sewer system in the Springfield area is limited. <br />Perpheral areas rely on septic tanks for waste treatment. Because <br />of the karat environment, effluent from septic tanks is not effec- <br />tively filtered and readily enters the groundwater system. Ade- <br />quate treatment facilities need to be provided for smaller urban <br />centers and rural areas'which are undergoing rapid urban develop- <br />ment. Urban development also causes problems in locating sites <br />for lakes, lagoon, and landfills; the karst environment is also <br />a factor (see Aley, Williams, and Massello). <br /> <br />City utilities of Springfield estimated the 1976 daily water <br />usage at 15 million gallons per day. It has been determined that <br />this amount could be sustained during severe drought conditions <br />from current sources. By 1985, water needs have been estimated <br />at 24.2 million gallons per day and serious shortages could occur <br />during peak demand periods of extended drought unless additional <br />sources are found. <br /> <br />The current water supply source of 'Springfield is from two <br />impoundments. Fulbright Spring, and wells. Industrial wells Dro- <br />vide water supply in addition to City Supply. Total sustained supply <br />considered available from these three sources is as follows: 15 <br /> <br />90 <br />