Ordinance No. 20585 - Laserfiche WebLink

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Table 36. Density assumptions, average dwelling units per vacant residential acre (net) for Capacity Method 1 Low Density Residential < 900, > 900, Slope <5% >_5 % <5% >_5% Medium Density Residential High Density Residential All Elevations All Elevations <5% <5% <5% <5% < 1 acre* 5.4 1-5 acre 5.4 5+ acre 5.4 13.4 13.4 13.4 12.5 12.5 12.5 32.6 32.6 32.6 32.6 32.6 32.6 Source: 2012 Residential Land Supply, City of Eugene The next step in Capacity Method 1 is adjusting the densities in Table 36 from net acres to gross acres, to account for buildable land that will be needed for rights -of way (e.g., streets and sidewalks). As lot size increases, the need to use some vacant land for rights -of way (e.g., streets and sidewalks) increases. For example: When building one dwelling on an existing 0.5 acre lot with two existing houses, the new dwellings will have access to existing rights-of-way. The portion of the lot with the new house will be devoted entirely to residential uses. When building one or more dwellings on a 10 -acre lot with no existing houses, the developer will need to devote land to rights-of- way for internal circulation and connecting to the City's street grid. Some portion of the lot will be devoted to rights-of-way and unavailable for residential development. Table 37 shows assumptions about the amount of land necessary to account for rights of way in the density assumptions. These assumptions are based on empirical analysis of LDR, MDR and HDR land divisions during the 2001 to 2008 period. 56 Table 37 shows the following assumptions about converting from net densities to gross densities: LDR. Lots smaller than one acre will require only 4% for rights -of way. Lots between one and five acres have a net -to -gross factor of 14%. Lots larger than five acres will have a net -to -gross factor of 26%. (Table 37). MDR. Lots smaller than one acre will require no land for rights -of way. Lots between one and five acres have a net -to -gross factor of 56 The plat analysis used was based on subdivisions platted from 2001-2008. On average the City received about 22 final subdivision plat applications per year during this period. During 2009-2012 on average the City received only 4 final subdivision plat applications per year. Therefore, given the small amount of 2009-2012 final subdivision plats, the 2001-2008 data was assumed to be a reasonable data set. The City's analysis of these developments is located. Page 126 ECONorthwest Part 11 — Eugene Housing Needs Analysis