Streams and Riparian Areas
Streams are seasonal or perennial surface waters that produce a defined channel, used by fish and other aquatic life for habitat and spawning.
Generally, streams do not include entirely artificial watercourses, such as ditches, unless they convey naturally occurring stream flow or contain fish habitat. Riparian areas are comprised of a stream and adjacent vegetation.
|
Stream Type |
Buffer |
Description |
|
Type F |
150 ft |
These are segments of natural waters that contain fish habitat as defined in WAC 222-16-030 and which are periodically inundated areas of their associated wetlands, or within lakes, or ponds, having a surface area of 0.5 acre or greater at seasonal low water. Streams of special significance within the City of Sammamish include:
|
|
Type Np |
75 ft |
These are all segments of natural waters that are perennial nonfish habitat streams. Perennial streams do not go dry any time of a year of normal rainfall, but do include intermittent dry portions of the perennial channel below the uppermost point of perennial flow (WAC 222-16-030). If the uppermost point of perennial flow cannot be easily identified, then it will be determined by a qualified professional. |
|
Type Ns |
50 ft |
These are segments of natural waters that are not Type F or Np waters. These are seasonal, nonfish habitat streams in which surface flow is not present for at least some portion of a year of normal rainfall and are not located downstream from any stream reach that is a Type Np water. |