Chapter V <br />Glossary <br />The purpose of the Glossary is to define commonly used terms in the Metro Plan. <br />Affordable housing: Housing priced so that a household at or below median income pays <br />no more than 30 percent of its total gross income on housing and utilities. The U.S. <br />Department of Housing and Urban Development's ( H[TD)1 AJ'&-figure for 1997 annual <br />median income for a family of three in Lane County is $33,900; 30 percent = <br />$ 847/month. ) <br />2. Annexation: An extension of the boundaries of a city or special district. Annexations are <br />governed by Oregon Revised Statutes. In the Eugene-Springficld metropolitan area, <br />annexations currently require approval by the Lanc County Local Government Boundary <br />Commission. <br />3. Assumption: A position, projection, or conclusion considered to be reasonable. <br />Assumptions differ from findings in that they are not known facts. <br />4. Best Management Practices (BMPs): Management practices or techniques used to guide <br />design and construction of new improvements to minimize or prevent adverse <br />environmental impacts. Often organized as a list from which those practices most suited <br />to a specific site can be chosen to halt or offset anticipated problems. <br />5. Buildable residential lands: Land in urban and urbanizable areas that is suitable, <br />available, and necessary for residential uses. Buildable land includes both vacant land <br />and developed land likely to be redeveloped. Lands defined as imbuildable within the <br />metropolitan urban growth boundary (UGB) are those within the floodway, land within <br />easement of 230 KV power lines, land within 75 feet of Class A streams or ponds, land <br />within 50 feet of Class B streams or ponds, protected wetlands and wetland mitigation <br />sites in Eugenc,'and wetlands larger than 0.25 acres in Springfield. Publicly owned land <br />is generally not considered available for residential use. Buildable land includes property <br />not currently sewered but scheduled to be severed within the 20-year planning period. <br />Class Streams lass I Streams in Lane Code): "Streams that have fish use <br />(currently <br />including fish use streams that have domestic water use," as defined in OAR 629 to 635. <br />7. Compact Urban Growth: The filling jn of vacant and underutilitzed lands in the UGB, as <br />well as redevelopment inside the UGB. <br />87. Density: The average number of families, persons, or housing units per unit of land. <br />Density is usually expressed as dwelling units per acre. <br />V-1 <br />Laurel Ridge Record (Z 15-5) Page 271 <br />