How does Vetiver stop soil erosion and stabilize slopes?


Vetiver is a proven solution to erosion and compromised slopes.  Installed in horizontal rows on the slope contour, Vetiver is an effective vegetative barrier.  Its densely-grouped stiff leaves slow the speed of water and trap soil, sediment, and debris that, left unchecked, would  slide off the slope.  Vetiver's dense, fibrous roots anchor the soil, hold in moisture, and conserve topsoil and plant nutrients that otherwise would be swept away.  Used worldwide to prevent landslides and erosion, it’s simple, effective, economical, and environmentally appealing.

   So, just how strong are Vetiver roots?!!


     Vetiver root = 1/6 mild steel = Lexan!

The term "roots like steel" certainly applies to Vetiver!  The average tensile strength of one root in Vetiver’s massive root system equals   one-sixth mild steel reinforcement (mPA 750), the same strength as    the GE's plastic, Lexan.     

Vetiver roots improve the shear strength of soil by 30 to 40%, earning Vetiver its reputation as “the green nail.”   (Actually, the security of Vetiver more closely resembles that of a screw but, with a nod toward social propriety, let's just call it a nail.)

How does Vetiver compare to alternatives?

People use a variety of methods to stop soil erosion and stabilize slopes.  Some solutions are fixed, and others are organic.  Some methods can be used together.

   

Rigid systems are limited.  As an organic solution, Vetiver Systems actually relieve stresses!

Conventional engineering methods use earthworks and engineered construction, including rock and reinforced concrete structures, sprayed-on concrete, gabions, steel gates, chain link, and fences. Fixed structures are brittle, expensive to install, and require costly repairs and maintenance.  They can be ineffective and unsustainable, not to mention unsightly.

    

Permanent vegetative barriers like Vetiver, on the other hand, provide   an attractive, effective, and affordable alternative.  Planted in rows on  the contour, Vetiver’s dense hedge and mass of fibrous roots create an impenetrable barrier that halts the passage of topsoil and debris, and dramatically slows the passage of water.  By anchoring the soil and slowing rainwater velocity, Vetiver reduces rilling and gullying, prevents landslides, stabilizes steep slopes, and halts erosion. 

Can Vetiver save my failing wall?

If your rock, CMU block, or retaining wall is bowing, deteriorating, or otherwise compromised, we can help!  Adding Vetiver behind a failing wall can relieve the water and earthen stress placed on it.  We can help!

        OK, any OTHER comparisons??!!

How about price??!!  Vetiver's not only a green solution, it saves  gr$$n, too!  Vetiver offers aesthetic and environmental advantages       at a fraction of the cost of fixed structures.  Consider the price in 2009 Honolulu dollars, of comparable barriers:

Barrier  (10' Long x 6' Tall)                                        Price               

Wood fence                                                                              $  600                  Hollow tile (CMU block)                                                             $1000                  Rock wall                                                                                  $1500+             Retaining wall                                                                           $2000+             Micro-pilings (each)                                                                   $2000+               Vetiver (10' L x 7' T x 2' Wide x 15' Deep)    typically less than $  300*

Including installation. The total cost for plants and installation depends upon the slope, but typically comes in well below the cost of a wood fence!!

+  The price doesn't include the cost of obtaining building permits (or the delays inherent in the permitting system), architect or engineer stamps, and other associated expenses.  Oh, and don't forget to tack on a  premium for a contractor to excavate and install footings deeper than 2'... 

In most cases, Vetiver is the superior organic alternative.  Mature Vetiver hedges keep weeds and undesirable grasses at bay, and retain moisture and nutrients.  They survive earthquakes, monsoons, hurricanes, grazing, extreme heat, drought, and extended submergence. Vetiver grows year-round, harbors no pests or diseases, and does not migrate.

Does Vetiver have any other advantages?

Yes!  Unlike other vegetative barriers, Vetiver is not fussy about its host site.  It grows in saline and sodic conditions, and even in acid sulphate or pure laterite soils.  Since it even survives fire (generating new shoots within days following fire), Vetiver is an effective firebreak in its green state.

Vetiver resists drought, submergence, fire, windstorms, and grazing. It thrives in sunny, damp conditions. It improves the quality of soil by retaining moisture, halting and replenishing nutrient loss, and improving the quality of ground water.  Vetiver rows are narrow (2’ wide) and do not compete with adjacent crops.

Curious?   Convinced?  Time for a Consultation???

                     Call us:  808-536-5444