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12 <br /> research, recreational, and open space use, should be <br /> protected from the adverse impacts of surrounding <br /> development. <br /> 6) Public water supply watersheds in the Township should be <br /> developed only in a manner that minimizes adverse <br /> impacts on water quality. <br /> Population and Land Requirement Projections <br /> One of the initial and fundamental steps in the land use <br /> planning process is calculating the amount of land required <br /> to accommodate projected growth in a given area. Generally, <br /> the amount of land required for residential and associated <br /> • non-residential uses are directly related to the size of the <br /> population. Tables 3- through 3- summarize the population <br /> trends and estimated land requirements for Hillsborough <br /> Township during the plan period. <br /> Table 3- summarizes population estimates and projections for <br /> population, while Table 3- projects the number of new homes <br /> required to meet the demands of new residents. The average <br /> household sizes used for projections in Table 3- assume that <br /> the trends towards smaller household sizes will continue, <br /> leveling off towards the end of the plan period. <br /> TABLE 3- <br /> POPULATION PROJECTIONS AND ESTIMATES, 1987-2005 <br /> HILLSBOROUGH TOWNSHIP, ALL JURISDICTIONS <br /> a <br /> 1980 1987 1990 1995 2000 2005 <br /> Total <br /> Population 8,599 11,427 12,858 15,653 19,055 23,196 <br /> • Population <br /> Change from ----- 2,828 4,259 7,054 10,456 14,597 <br /> 1980(number) <br /> a <br /> Source: 1980 Census of Population <br /> b <br /> Source: Orange County Planning Department <br /> Based on an exponential extrapolation of the average growth <br /> rate from 1970-1987 of 4.01% annually. <br /> 3.9-12 <br />