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are not limited to) ldaho fescue (Festuca idahoensis). Bluebunch Wheatorass (Pseudoroeqneria spicata). Sandberg Bluegrass (Poa secunda). Thurber's Needlegrass (Achnatherum thurberianum). and Needle-and-Thread (Hesperostipa comata). ln areas with oreater precipitation or on soils with hiqher moisture-holdino capacity. shrub-steppe can also support a dense layer of forbs (i.e.. broadleaf herbaceous flora). Shrub-steppe contains various habitat features. including diverse topooraphy. riparian areas. and canyons. Another important component is habitat quality (i.e.. deqree to which a tract resembles a site potential naturalcommunitv). which mav be influenced bv soil condition and erosion: and the distribution. coveraqe, and vigor of native shrubs. forbs. and qrasses. Sites with less disturbed soils often have a laver of algae. mosses. or lichens. At some more disturbed sites. non-natives such as Cheatqrass (Bromus tectorum) or Crested Wheatqrass (Aoropvron cristatum) may be co-dominant species. Fire disturbance is an ecological component of shrub-steppe. Shrub-steppe disturbed by fire mav lack the aforementioned habitat components durinq periods of post-fire recoverv 17A.02.715 Site PotentialTree Height (SPTH) "Site Potential Tree Height" or "SPTH" is the average maximum height of the tallest dominant trees (200 years or more in aoe) for a given area. 17A..02.720 Soft Armorinq. "Soft armoring" means stream bank erosion controlpractices usino predominantlv natural materials in a desiqn that minimizes impacts to natural processes.This term is frequently used in reference to bioenqineerinq. 17A.02.730 Species of Local lmportance. "Soecies of local importance" are those species that are of local concern due to their population status or their sensitivity to habitat alteration or that are qame species. 174.02.740 Streams "Streams" see definition for "Watercourse" 174.02.750 Stream or Water Tvpe "Stream or Water Types" are fullv defined in WAC 222-16-030. An abbreviated definition is provided below. but the fullWAC definition is adopted and applies: 1. "Tvpe S Water" means all desiqnated "shorelines of the state".2. "Tvpe F Water" means streams other than Tvoe S Waters that contain fish habitat or are diverted for certain kinds of domestic use or for use bv fish hatcheries. 3. "Tvpe Np Water" means streams that are perennial nonfish habitat streams.4. "Tvpe Ns Water" means streams that are seasonal. nonfish habitat streams. which are phvsically connected bv an above-ground channel system to Tvpe S. F. or Np Waters. 31