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HomeMy WebLinkAboutPermit Miscellaneous 1994-3-18 I\c~o.. . DEVELOPMENT SERVICES DEPARTMENT 225 FIFTH STREET SPRINGFIELD, OR 97477 (503) 726-3753 FAX (503) 726,3689 March 18, 1994 Curtis Greer Monta Loma MH Park 2150 Laura Street Springfield, OR 97477 ~ Dear Mr. Greer: Although I vasn't in attendance at the Springfield Planning Commission meeting on March 16, I vas informed by Greg Mott, Planning Manager, that you spoke before the Commission regarding the requirement of installing roof gutters on your storage/maintenance structure. It is my understanding of the issue that you are questioning the position of the Community Services Division-Building Safety to require the installation of roof storm gutters on buildings. To my knovledge, roof gutters and/or roof drains have been required on buildings in Springfield since the adoption of a State-vide Building Code in 1974. Section 3207, (a) Roof Drainage of the Oregon Structural Specialty Code provides in part: Vhen required by the building official, a storm drainage system shall be installed. Such drainage system required by the building official or Subsection (b), (c) or (d) of this section may include gutters, drains or necessary associated piping vhich shall be in accordance vith the Plumbing- Code, . Section 1401. Storm Vater Drainage Required of the Oregon Plumbing Specialty Code provides in part: All rain, storm and other surface runoff vater from roofs shall be conveyed by such piping to a storm sever, storm sevage system, dry vell, drainage ditch, street gutter or natural surface drainage course in a manner vhich vill not cause flooding to adjacent property. All points of disposal shall meet with the provisions of this Code and those of the department having jurisdiction. Roof gutters are required as part of the building system to protect the structure from potential moisture damage. Vithout containment of roof storm water and the proper conveying of the storm drainage avay from the structure, building deterioration may likely occur, Storm water vhich "sheet drains" over the roof edge can result in accelerated deterioration of the exterior building envelope, potential structural failure resulting from soil erosion or soil saturation around the foundation perimeter, and moisture related sub-floor damage where buildings are constructed with a recessed under-floor area. '. . Curtis Greer page 2. Vhen property is developed the natural surface absorption area of a lot is substantially reduced. The ability of the remaining portion of the property to dissipate the increase of storm vater resulting from the impervious surfaces is difficult in most developments. Surface ponding often occurs or storm vater migrates to adjacent properties. In most situations vhere a positive grade exists to the street or to an approved drainage vay, the storm drainage collected from the roof is also required to be piped to the street curb or to an approved drainage system. It is my understanding that in your specific si.tuation, because of the eKisting curb configuration and the large size of the property, the collected storm vater from the roof is required to be diverted avay from the structural only. If you have any questions regarding the above. information or if I can provide additional assistance, please contact me at your convenience at 726-3668. Sincerelv. - ~~ ~-- , \. '\J,:2K..h. uave uent Community Services Manager cc: Greg Mott, Planning Manager