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<br />1) Tenninal storage reservoir which' provides for not only pre-settling to the treatment <br />unit, but provides for a more Wlifonn and consistent water quality. <br /> <br />2) The facilities' have the capability to return backwash water directly to the terminal <br />storage reservoir. It has been determined by the operating staffthathy slightly <br />overfeeding polymer in. the backwash return line, the tenninal storage reservoir can <br />achieve enhanced settling characteristics. <br /> <br />Figure 4: Site Plan <br /> <br />r----------------------------l <br /> <br />I I <br />I / /_~--- I <br />I i /~~ I <br />I I <br />I I <br />I I <br />I I <br />I I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />", <br />I <br />I <br />..... I <br />~- ~ I <br />I <br /> <br />L____________________________J <br /> <br />3) The flocculators have been equipped with variable speed drive units. Variable speed <br />drive units were originally installed for plant flexibility and adjusting for change in water <br />quality conditions. The plant has also found that if operations .of the rapid mix unit is <br />impaired, adequate additional mixing can be achieved by adjustment of the variable speed <br />drive and flocculator units. This type of operating flexibility has greatly assisted the~water <br />treatment plant operators in maintaining the Texas Optimization criteria on settled water. <br /> <br />" <br /> <br /> <br />l <br /> <br />,I <br />" <br />Il. <br /> <br />1 <br />4) The sedimentation bas'in is equipped with tube settlers for enhanced Clarification. The. <br />Brown County Water Improvement District #1's plant was one of the first in West Texas <br />to utilize tube settlers for not only enhanced clarification, but for reduction of the state of <br />Texas required six hour detention time. With the addition of the tube settlers, the <br />sedimentation basin detention time has been reduced from six hours to two hours, <br />resulting in a substantial construction cost savings while demonstrating excellent <br />clarification capabilities. The sedimentation basin also is uniquely designed to allow for <br />mechanical sludge collection in the first half of the basin where the majority of solids are <br />initially deposited. <br /> <br />5) The treatment plant is also one of the first in West Texas to employ declining rate <br />filters. There are two basic methods of operating filters. They differ primarily in the way <br />that the driving force is applied across the filter. These methods are referred to as <br />constant rate filtration and variable declining rate filtration. <br /> <br />In constant rate filtration as constant pressure is supplied across the filter system and the <br />filtration rate or water level is then held constant by the action of a mec~anically operated <br />