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The County's average annual growth rate for the 1980 - 1993 period <br />was 3.7%. For the next twenty years, however, projections reflect <br />a reduced average growth rate. These projections are listed in the <br />following table, and they indicate that the County's growth is <br />expected to continue: <br />Indian River County Estimated Population Projections <br />and <br />Effective Annual Change <br />Estimated % Annual Change <br />Year Population Over Previous Years <br />1995 <br />102,200 <br />+3.4 <br />2000 <br />114,500 <br />+2.3 <br />2005 <br />126,600 <br />+2.0 <br />2010 <br />137,200 <br />+1.6 <br />2015 <br />148,200 <br />+1.6 <br />2020 <br />1581100 <br />+1.3 <br />• Facility Needs <br />With the county's existing population and its anticipated new <br />growth, the demand for facilities will increase. This increase in <br />county population can be related to increases in facility demands. <br />The population/facility demand relationship can be illustrated by <br />considering the impact of constructing new housing units. <br />Generally, a housing unit or household is comprised of an <br />approximate average of 2 to 2.5 persons. For each housing unit, a <br />specific amount of facility demand may then be anticipated. By <br />understanding the facility demand and its relationship to housing <br />units, the demands of growth may be understood. The following <br />descriptions provide a picture of the relationship of households to <br />Transportation, Water and Sewer facilities: <br />Transportation <br />Each new housing unit may be expected to require 0.003 major <br />road (arterial and collector) lane miles. This means that, <br />for every 333 housing units constructed, the County must then <br />construct one full lane mile of major roadway. It costs the <br />County approximately $500,000.00 to construct one full lane <br />mile of major roadway. This County construction cost equals <br />approximately $1,501.50 per housing unit. Since the County's <br />traffic impact fee rates average $1,113.22 per unit, it is <br />evident that traffic impact fees do not cover the entire cost <br />of necessary transportation system expansion. The County, <br />therefore, must makeup the cost difference through other <br />revenue sources. <br />Water <br />Each new housing unit is estimated to require 250 gallons of <br />water per day (gpd). For every 1000 housing units connected <br />to a water plant, 250,000 gpd of water treatment plant <br />capacity will be required to serve the units. Water treatment <br />plants produce water at a millions -of -gallons -of -water -per -day <br />rate (mgd). For a 1 mgd plant, 1000 households would use 258 <br />of the plant's capacity. To accommodate and connect more <br />housing units, the County must expand the production capacity <br />of the water plant to replace the capacity to be used by.the <br />connected housing units. It costs the County approximately <br />$3.00 per gpd capacity to construct or expand a water <br />treatment plant. This construction cost equals approximately <br />$750 per household. However, it is more effective for the <br />County to expand water treatment plants in capacity increments <br />of 0.5 mgd. Furthermore, the cited expansion cost is limited <br />solely to plant construction. The cost does not include <br />related -construction costs such as property acquisition or <br />15 <br />MAY 189 1995 <br />sooK 95 PAGE 124 <br />I <br />