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integrity of the ecosystem, and which, if altered, may reduce the likelihood that the species will persist over the long term. These areas may include, but are not limited to, rare or vulnerable ecological systems; communities; and habitat or habitat elements including seasonal ranges, breeding habitat, winter range, and movement corridors; and areas with high relative population density or species richness. These areas do not include such artificial features or constructs as irrigation delivery systems, irrigation infrastructure, irrigation canals, or drainage ditches that lie within the boundaries of and are maintained by a port district or an irrigation district or company. Natural watercourses such as streams and rivers that carry irrigation water are not considered to be an artificial feature. (Ord. 2016-006, 2016) 17B.02.250 Floodplain. "Floodplain" is synonymous with one hundred-(100)-year floodplain and means that land area susceptible to inundation with a one percent (1%) chance of being equaled or exceeded in any given year. The limit of this area shall be based upon flood ordinance regulation maps or a reasonable method which meets the objectives of the Act. (Ord. 2016-006, 2016) 17B.02.255 Floodway. "Floodway" means the area, as identified in a master program, that either: 1. Has been established in federal emergency management agency flood insurance rate maps or floodway maps (defined as the channel of a river or other watercourse and the adjacent land areas that must be reserved in order to discharge the base flood (one hundred-(100)-year flood) without cumulatively increasing water surface elevation more than a designated height of one (1) foot); or 2. Consists of those portions of a river valley lying streamward from the outer limits of a watercourse upon which flood waters are carried during periods of flooding that occur with reasonable regularity, although not necessarily annually; said floodway being identified, under normal condition, by changes in surface soil conditions or changes in types or quality of vegetative ground cover condition, topography, or other indicators of flooding that occur with reasonable regularity, although not necessarily annually. Regardless of the method used to identify the floodway, the floodway shall not include those lands that can reasonably be expected to be protected from flood waters by flood control devices maintained by or maintained under license from the federal government, the state, or a political subdivision of the state. (Ord. 2016-006, 2016) 17B.02.260 Frequently flooded areas. "Frequently flooded areas" means lands in the floodplain subject to a one percent (1%) or greater chance of flooding in any given year, or within areas subject to flooding due to high groundwater and those lands that provide important flood storage, conveyance, and attenuation functions. These areas include, but are not limited to, streams, rivers, lakes, wetlands, and areas where high groundwater forms ponds on the ground surface. As designated and classified determined by a local government in accordance with WAC 365-190-110. Classifications of frequently flooded areas include, at a minimum, the one hundred-(100)-year floodplain designations of the Federal Emergency Management Agency and the National Flood Insurance Program. (Ord. 2016-006, 2016)