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TABLE NO. 1 <br />PAST POPULATION PROGRESSION <br />FUTURE POPULATION <br />In the design.of municipal utilities it is necessary to design for a <br />future population anticipated at some future date, Normally this date is 15 <br />to 25 years hence and the population is estimated for that date. While there <br />are many reasons for this future design period, the basic reason is one of <br />economic feasibility. If the construction of improvements is for the antici- <br />pated population increase of only a few years, excessive costs will be encoun <br />tered due to early modification or unnecessary parallel construction. Con- <br />versely, if too ambitious a program is undertaken, surplus facilities sit idle <br />while the interest charges on their construction costs create an undue <br />financial hardship on the city. <br />In the eastern sections of our country it is relatively simple to study <br />the past growth records of a community and to reasonably predict the future <br />growth trends, <br />- 3 - <br />Annual Increase During <br />Year <br />Population <br />0 -Year Period <br />1890 <br />698 <br />1900 <br />1,091 <br />5.6% <br />1910 <br />3,651 <br />23.4% <br />1920 <br />5,065 <br />3.9% <br />1930 <br />5,506 <br />0.976 <br />1940 <br />6,145 <br />1.1% <br />1950 <br />6 <br />1.0% <br />1960 <br />9,734 <br />4.4% <br />FUTURE POPULATION <br />In the design.of municipal utilities it is necessary to design for a <br />future population anticipated at some future date, Normally this date is 15 <br />to 25 years hence and the population is estimated for that date. While there <br />are many reasons for this future design period, the basic reason is one of <br />economic feasibility. If the construction of improvements is for the antici- <br />pated population increase of only a few years, excessive costs will be encoun <br />tered due to early modification or unnecessary parallel construction. Con- <br />versely, if too ambitious a program is undertaken, surplus facilities sit idle <br />while the interest charges on their construction costs create an undue <br />financial hardship on the city. <br />In the eastern sections of our country it is relatively simple to study <br />the past growth records of a community and to reasonably predict the future <br />growth trends, <br />- 3 - <br />