660-038-0070 Adjust Residential Lands Inventory to Account for Constrained Lands A city must adjust the inventory of residential lands prepared under OAR 660-038-0060 to account for constrained lands using this rule. (1) The city must identify the following physical constraints on land inventoried as vacant or partially vacant under OAR 660-038-0060: (a) Floodways and water bodies. For the purpose of this subsection, “water bodies” includes; (A) Rivers; and (B) Lakes, ponds, sloughs, and coastal waters at least one-half acre in size. (b) Other lands within the Special Flood Hazard Area as identified on the applicable Flood Insurance Rate Map; (c) Lands within the tsunami inundation zone established pursuant to ORS 455.446; (d) Contiguous lands of at least one acre with slopes greater than 25 percent. Slope shall be measured as the increase in elevation divided by the horizontal distance at maximum 10-foot contour intervals; (e) Lands subject to development restrictions as a result of acknowledged comprehensive plan or land use regulations to implement Statewide Planning Goals 5, 6, or 7, and (f) Lands subject to development prohibitions, natural resource protections, or both in acknowledged comprehensive plan or land use regulations to implement Statewide Planning Goals 15, 16, 17, or 18. (2) For lands identified in section (1), the city may reduce the estimated residential development capacity by the following factors in terms of acreage: (a) For lands within floodways and water bodies: a 100 percent reduction. (b) For other lands within Special Flood Hazard Area as identified on the applicable Flood Insurance Rate Map: a 100 percent reduction. (c) For lands within the tsunami inundation zone: no reduction unless the acknowledged comprehensive plan or land use regulations applicable to such areas prohibits or reduces residential development, in which case the reduction shall be based upon the maximum density allowed by the acknowledged comprehensive plan or land use regulation. (d) For lands with slopes that are greater than 25 percent: a 100 percent reduction. However, if the lot or parcel includes land with slopes less than 25 percent, the reduction applies only to the land with slopes greater than 25 percent. Slope shall be measured as the increase in elevation divided by the horizontal distance at maximum ten-foot contour intervals; (e) For lands subject to development restrictions in an acknowledged comprehensive plan or land use regulations developed pursuant to Statewide Planning Goals 5, 6, or 7: a reduction to the maximum level of development authorized by the acknowledged comprehensive plan or land use regulations. (f) For lands subject to development prohibitions, natural resource protections, or both, in an acknowledged comprehensive plan or land use regulations that implements Statewide Planning Goals 15, 16, 17 or 18: a reduction to the maximum level of development authorized by the acknowledged comprehensive plan or land use regulations. (3) The residential BLI amount for each type of needed housing for a city is the amount of buildable land for that needed housing type determined in OAR 660-038-0060 reduced by the constraints as determined in this rule. Statutory/Other Authority: ORS 197.040, 197A.305, 197A.320 & 197.235 Statutes/Other Implemented: ORS 197A.300, 197A.302, 197A.305, 197A.310, 197A.312, 197A.315, 197A.320 & 197A.325 History: LCDD 6-2015, f. 12-29-15, cert. ef. 1-1-16