Ordinance No. 20351 - Laserfiche WebLink

Home Browse Search

Ordinance - 10 4. Construction of new utility facilities shall be planned and timed to minimize adverse impacts to wildlife and habitat within a /WR conservation area. 5. Impacts to plant species listed as threatened or endangered by the Oregon Department of Agriculture or the U.S. Fish and Wildlife Service shall be avoided. (f) Wetland or riparian area enhancement, restoration or creation activities. Subject to EC 9.4980 /WR Water Resources Conservation Overlay Zone Development Standards (2) through (5). (g) Construction of stormwater quality treatment facilities that do not discharge into a stream or wetland within the /WR conservation area and that do not include adding impervious surfaces. Subject to EC 9.4980 /WR Water Resources Conservation Overlay Zone Development Standards (2) though (5). (h) Discharge of stormwater collected from impervious surfaces into a wetland or stream within the /WR conservation area, if the following standards 1. through 4. are met: 1. No other gravity-based stormwater discharge options are available for the site. 2. All of the stormwater runoff from the development site that will result from the water quality design storm will be treated by a privately constructed and maintained stormwater management facility prior to discharge. For purposes of this subsection, the term "water quality design storm" means a theoretical storm for estimating the amount of stormwater runoff to be treated, and is different for volume based facilities and flow-through facilities as follows: a. Facilities designed to store and treat a volume of stormwater shall be sized using a water quality design storm of 1.4 inches of rainfall in 24-hours using Soil Conservation Service (SCS now the Natural Resources Conservation Service) methodology. b. Facilities designed to treat a rate of flow draining through them shall be sized using a rainfall intensity of 0.12 inches per hour for facilities off-line from the conveyance system, or 0.21 inches per hour for on-line facilities, and using the rational equation. 3. The stormwater is treated prior to discharge utilizing one or more of the following stormwater management facilities: eco-roof, stormwater planter, swale, filter, infiltration basin, and manufactured treatment facility. 4. Design and construction of the stormwater management facility is subject to EC 9.4980 /WR Water Resources Conservation Overlay Zone Development Standards (2) through (5). (i) Construction of paved pathways of no more than 6 feet in width for passive recreation within the conservation area for Category A, B, or C streams or Category A wetlands, and no more than 12 feet for bike paths identified in TransPlan. Subject to EC 9.4980 /WR Water Resources Conservation Overlay Zone Development Standards (2) through (6) and (11 ). U) Construction of a private access road where no other point of access is available except through the /WR conservation area of a Category A, 8,