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33 <br /> CHCCS School Impact Fee Report(DRAFT) <br /> Figure A4. Housing Unit Growth 2004-2013: CHCCS <br /> Net Increase <br /> Housing Units 2004 2013 2004-2013 %of New Units <br /> SF Detached 14,261 15,304 1,043 38% <br /> SF Attached/Duplex 2,243 3,005 762 28% <br /> Multifamily/Other 16,052 16,968 916 34% <br /> Manufactured Home 1,060 1,069 9 0% <br /> Total 33,616 36,346 2,730 100% <br /> Source:Orange County <br /> ESTIMATED TI <br /> TischlerBise calculated student generation rates for each school system in Orange County based on data <br /> from Orange County.The term "student generation rate" refers to the number of public school students <br /> per housing unit in each school system: OCS and CHCCS. Public school students are a subset of school- <br /> aged children, which includes students in private schools and home-schooled children. <br /> Student generation rates are important demographic factors that help account for variations in demand <br /> for school facilities by type of housing. Students per housing unit are held constant over the projection <br /> period since the impact fees represent a "snapshot approach" of current levels of service and costs. <br /> The student generation rates were calculated using student address data geocoded to Orange County <br /> land records tracking housing unit types. These data were analyzed for units built during two different <br /> time periods: prior to 2004, and from 2004 through 2013. Data were collated for these two discrete <br /> periods in order to evaluate whether new development patterns and demand trends in the residential <br /> market had impacted student generation rates for recently built units. Student generation rates for units <br /> constructed from 2004 to 2013 were drawn from an earlier TischlerBise study,finished in May 2015. <br /> Student generation rates were provided by housing unit type for the categories used in each district.That <br /> is,for Orange County, rates are provided for each type of unit: (1)Single Family Detached,(2)Single Family <br /> Attached/Multifamily, and (3) Manufactured Homes. For CHCCS, rates are provided for: (1) Single Family <br /> Detached, (2)Single Family Attached, (3) Multifamily,and (4) Manufactured Homes. In addition,the rates <br /> reflect demand by type of school level—elementary, middle, and high. <br /> Initially, TischlerBise and County staff attempted a simple combination of the older and newer student <br /> generation and housing unit type data in order to derive student generation rates for housing type <br /> categories that are representative of the impact of a housing unit on required school capacity over the <br /> entire life of that unit. In order to enhance the specificity of its student generation rates,the County tasked <br /> TischlerBise with determining these rates by the size of the unit,measured by bedroom count.To facilitate <br /> this process, the County had begun to gather bedroom count attributes for most new units constructed <br /> since 2004.Therefore,for the most part, student addresses for new units could be matched to a bedroom <br /> count record. <br /> 26 <br />