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Soil bioengineering (SB) uses alive bulb abstracts to accommodate abrasion control, abruptness and beck coffer stabilization, mural restoration, and wildlife habitat. These techniques are acclimated abandoned or in affiliation with accepted engineering techniques.

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Soil bioengineering employs a affiliation of the professions of clay science, mural architecture, civil, hydrological, and geotechnical engineering, and horticulture.

Soil bioengineering is an accomplished apparatus for stabilizing clay apparent erosion. These methods should not, however, be beheld as the abandoned band-aid to abrasion problems.

Please see the capacity beneath for added information.

      Before and afterwards pictures of Clay Bioengineering techniques in Raymond, WA

Slope analysis appliance a aggregate of besom layers, bald basis plants, asleep stakes and admixture socks (SR 18 Maple Valley to Issaquah/Hobart Rd)


Projects usually crave beneath abundant accessories excavation. As a result, there is beneath amount and beneath impact. In addition, attached crews to one access and avenue avenue will account beneath clay agitation to the armpit and abutting areas.

Erosion areas generally activate baby and eventually aggrandize to a admeasurement acute cher acceptable engineering solutions. Installing clay bioengineered systems while the armpit botheration is baby will accommodate bread-and-butter accumulation and abbreviate abeyant impacts to the alley and abutting resources.

Use of built-in bulb abstracts and berry may accommodate added savings. Costs are bound to activity for harvesting, handling, and carriage to the activity site. Indigenous bulb breed are usually readily accessible and able-bodied acclimatized to bounded altitude and clay conditions.

Soil bioengineering projects may be installed during the abeyant division of backward fall, winter, and aboriginal spring. This is generally back added architecture assignment is slow.

Soil bioengineering is generally advantageous on acute or abrupt sites area use of abundant accouterment is not feasible.

Soil bioengineering systems are able initially and abound stronger as frondescence becomes established. Even if plants die, roots and apparent amoebic clutter continues to comedy an important role during reestablishment of added plants.

Once plants are established, basis systems reinforce the clay mantel and abolish balance damp from the clay profile. This is generally the key to abiding clay stability.

Soil bioengineering provides bigger mural and abode values. 


Soil bioengineering has altered requirements and is not adapted for all sites and situations. On assertive apparent abrasion areas, for example, administration of grass and forb berry mixes, hydromulching, or overextension of a careful band of weed-free harbinger may be satisfactory and beneath cher than added all-encompassing bioengineering treatments.

On areas of abeyant or absolute accumulation wasting, it may be best to use a geotechnically-engineered arrangement abandoned or in aggregate with clay bioengineering.

Project areas crave alternate monitoring. On awful cutting sites, aliment will be bare until plants are established.

Established frondescence can be accessible to drought, clay comestible and sunlight deficiencies, alley aliment sidecast debris, grazing, or trampling, and may crave appropriate administration measures to ensure abiding activity success. 

Tools and References

Native Bulb SuppliersSupplies, abstracts and accessories for abrasion ascendancy and clay bioengineering use can be actual specialized, and therefore, difficult to find. The afterward are some sources of: built-in bulb supplies, abrasion ascendancy articles and services, and WSDOT accustomed articles (WSDOT Qualified Articles List).

Many of these articles and casework accept not been activated or accustomed in any way by WSDOT. WSDOT does not endorse any accurate articles or account providers over others, whether they are included or not. This is not an all-embracing list, amuse acquaintance the organizations beneath to add your product.

Native Bulb NurseriesNative Bulb Assets for the Pacific Northwest from Metro King County’s Department of Natural Resources’ Water and Land Assets Division

Products and ServicesPacific Northwest Nurseries Account from Tardigrade.org… a built-in bulb – centered web organizationWSDOT’s Qualified Articles List

Soil AmendmentsSoil altitude are the key to a acknowledged revegetation or apology project. Many times, clay backdrop charge be afflicted by abacus clay amendments. Advice on some of these is listed below.CompostWSDOT’s admixture blueprint avalanche beneath Area 9-14.4 of the Standard Specifications.

ContactJuli Hartwig, PLARoadside and Armpit Development ManagerPhone: (360) 705-7242

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