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    Tuesday
    Sep302014

    It's coming - The BioEngineering Set!!!

     We are pleased to announce one of our newest creations!

    The BioEngineering Set includes to jam packed DVDs geared towards well - BioEngineering!

    Please feel free to contact us at watchyourdirt@gmail.com for more information and how to reserve your copy today!!!

     Or visit our Online Store at watchyourdirt.bigcartel.com

    - The Dirt Time Team

    Wednesday
    Sep242014

    Sg. Pedu is COMPLETE!!-

    This was quite a project for sure!!  Remember the purpose was to increase the low-flow water surface elevation so the irrigation pumps can draw water.  

    This multi-million $$$ irrigation project serves the regions rubber tree, banana, and fruit plantations and rice growing.  The facilities are co-managed by JPS (Malaysian Department Irrigation and Drainage) and MADA (Malaysian Agricultural Development Authority).


    Construction  started about August 16.  At first work was a little slow while we coordinated all the heavy equipment and rock delivery.  Transportation of the bigger rock needed was problematic because it was difficult to dump and could easily damage the trucks - lost a couple of tailgates and sideboards!!


    We also had to disassemble the existing gabion baskets.  The Gabion Check Dam was built a couple of years prior.  It was indented to raise the low water surface elevation about 6-9 ft (2-3m) but the “mighty” Pedu River did “an end run” and eroded about 20m of the right descending banK.  We took down 2 layers of baskets (about 2 m), left one layer in place (which became our low-water bridge to the other side) and built an Engineered Newbury Riffle.  


    The riffle crest was about 30 m upstream of the old gabion crest and about 60 m downstream of the pumps.  The crest was approximately 2.5m high and the riffle is 40m long.  The design criteria for Newbury Rock Riffles (NCHRP Report 544) is 10 to 20:1  (riffle length:crest height).  We used over 3000m2 (or approx. 5600 T) of stone!!

    It was not feasible nor practicable to deliver or use 5000T of really large stone, that is probably why Gabions were the first choice.  What we did was used a mixture of well-graded, poorly-sorted angular granitic stone.  The rock graded from 36” (mean diameter) to 2”.  D50 was probably in the range of 12-16”.  


    Construction:  The most critical component and difficult construction is the required manner of laying the rock.  It takes quite a while to understand how to compress, buttress and build the structure - one does not simply place large rock on bottom, followed next larger etc.  I try to visualize “making” as many “contact points between adjacent rocks” as possible.  Really large rocks might have 3 or 4 contact points while a well-graded, self-launching stone has infinitely more.  

    Also the riffle must be built in a way to minimize turbulent flow while having as much surface roughness as possible.  


    We also build one Bendway Weir about 20m upstream of the Newbury Riffle.  Because the Pump House and structures are on a gentle bend in the river (the pump on inner bend) I determined a redirective structure would ensure the high flows went over the crest and not around the structure.  Additionally we laid a tie-back/keyway almost 300 ft into the Right descending bank!!


     The last two weeks of work was challenging because the communication and construction oversight had to be done long-distance.  The construction crew, with oversight from Osman and Wing, have became experts!!  Now we shall all wait and see and monitor how the structures.

    You can now see the structure and reach in its entirety.  

    Thanks for reading

    - John McCullah, Dirt Time TV Host

    Tuesday
    Sep162014

    FUN FACT: BMP: Boulder Clusters - What is it???

    Watch Your Dirt Fun Fact of the Week!!!

    Boulder Clusters are one of the Best Management Practices used out in the field today!

    Boulder clusters are simple, natural-looking features that add visual diversity and habitat to degraded, uniform reaches. Consequences of failure are generally slight.

    What are Boulder Clusters?

    Boulder Clusters are large rocks placed strategically in a stream either one itself or in groups to protect eroding banks and provide instream cover for the organisms of the river. Natural streams with beds coarser than gravel often feature large roughness elements like boulders that provide hiding cover and velocity shelters for fish and other aquatic organisms. If a constructed or modified channel lacks such features, adding boulder clusters may be an effective and simple way to improve aquatic habitat.

    What are the benefits of using Boulder Clusters?

    Boulder clusters provide hiding cover and velocity shelters for fish through the turbulence found in their wakes. They also provide stony substrate for attachment-type macroinvertebrates. If bed material is fine enough for scour to occur, boulders also develop stable pool habitat and physical diversity associated with a range of depths, velocities, and bed material sizes. Boulder clusters can make a relocated or reconstructed channel look more natural and add visual interest to an otherwise uniform view. If desirable, boulder clusters may be configured to trap woody debris and provide additional cover benefits. Boulder clusters provide fish rearing habitat, and areas for adult fish. 

    What type of "boulder" should be used?

    The boulders should be found along the surrounding watershed - as raw as you can find them! Or if boulders are not available, imported boulders should resemble native materials. Irregular-shaped angular boulders of durable rock are preferred, although some installations have been done with gabions and other man-made materials. Gabions and similar devices are aesthetically inferior and eventually fail due to abrasion, corrosion or vandalism. Boulders may be placed using a large excavator with a thumb, or other heavy equipment.

     

    For more information on BMPs and Watch Your Dirt Facts, please subscribe to our blog here!

    Also, for infomation on our BMP publications, software, and case studies - plus how to get your hands on one

    check out our store here @ our WatchYourDirtStore !!!

     

    Thank for reading and see you next week 

    - The Dirt Time Team

    Tuesday
    Sep092014

    Fun Facts: Coconut Fiber Rolls

     

    A Watch Your Dirt Fun Fact of the Week!!!

    Coconut Fiber Rolls are a specific type of fascine/bundle/wattle.

    These rolls are typically placed alongside stream banks and are flexible enough to follow the bank curvature.

    Coconut Fiber Rolls are also called Coir rolls, fiberschines, reed rolls, fiber logs, coir geotextile rolls, coir fascines.

     


    What are Fiber Rolls?

    Fiber rolls are manufactured, elongated cylindrical structures that are placed at the toe of a streambank. They are typically made of coconut husk fibers bound together with a geotextile netting. The external binding or netting forms a type of open weave "sock" that contains and provides some shape to the internal mass of fiber husks (see Figure 1). When natural, coconut, or coir fabric is used for this purpose the fiber rolls are usually referred to as coir rolls or "fiberschines". These coir rolls are typically manufactured in 35 cm or 40 cm (12 in or 18 in) diameters and lengths of 6 m (20 ft). They are staked or otherwise anchored in place at the toe of a streambank, generally at the stream-forming flow stage within a zone of perennial growth.

     What are the benefits of utilizing Coconut Fiber Rolls?

    They help establish healthy riparian habitat conditions that will provide cover. Individual stems or clumps of various sizes and types of reed grass, sedges, and bulrushes can be inserted into and around the fiber roll. Coconut fiber rolls do not intrude visually; they provide a soft, natural boundary to a river's edge.

    What is the purpose of implementing Coconut Fiber Rolls into plans?

     Coconut fiber rolls are placed at the bottom of streambanks to help prevent scour and erosion. They are used to provide channel and shoreline stabilization in areas of low to moderate shear stress. They act as a type of "soft" toe armor and encourage the growth of vegetation. A "soft toe" will function and endure on the insides of meanders, and in tangent zones that are beyond the influences of a channel bend. Vegetative establishment in and around the fiber roll increases surface roughness, slows water velocity, and causes sediment to drop out and accrete at the toe. This system is quite flexible and can conform to existing curvature of a streambank.

    For more information on BMPs and Watch Your Dirt Facts, please subscribe to our page here!

    Also, for more information on our BMP publications per Erosion Control and Streambank Stabilization, as well as efficient case study projects - please visit our store @ WatchYourDirt.BigCartel.com !!!

     

    Thanks for reading!

    - The Dirt Time Team

    Tuesday
    Sep022014

    An Excerpt from Bioengineering Case Studies : Stafford Slide

    Bioengineering Case Studies - by Wendi Goldsmith, Donald Gray, and our very own John McCullah, presents a range of well-documented case studies on key techniques and best practices for bio-stabilization projects. This publication also emphasizes evaluation and comparison of different techniques and challenges across a wide range of project types and geographies!

    Here is an excerpt from Bioengineering Case Studies with a quick look inside the book!


     

     This is another great Chapter from recently published Bioengineering Case Studies: Sustainable Stream Bank and Slope Stabilization. For more information on the compilation, including details on the authors AND how to order please see to: Springer.com/bioengineeringcasestudies.

    We now offer this brillant book in an ebook format!