Stopping the flow of sediment into Pelekane Bay: that is what all our work is all about. The axiom is: the bay won’t heal until the sediment stops flowing into it. Question: how do we do that? Answer: until our out plantings grow mature enough to assume that job, we have to create temporary abatements. Installing Sediment Stop fabric is our first step.
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| From Sediment Stop blog 7.10 |
What we start with are deeply eroded gullies that are formed by the un-impeded, overland rush of water. These gouged gullies get progessively longer and deeper with each storm and produce the vast volumes of sediment that flow into Pelekane Bay. By breaking the slope into shorter segments, the sediment stop fabric keeps the rainfall, that flows across the soil surface, from gaining too much speed.
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| From Sediment Stop blog 7.10 |
Our crew first needs to reshape the vertical sides of these gullies into more softly sloping edges. Gentler slopes allow plants to more easily colonize and further slow the flow of water. Because these areas are remote and the terrain is treacherous, this is all hand work. I am told this goes faster than one would imagine.
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| From Sediment Stop blog 7.10 |
The fabric itself consists of a 70% straw and 30% coconut-fiber matrix reinforced with 100% biodegradable netting. It lets the collected water flow through while catching and holding the sediment. Our crew un-rolls and then re-rolls the fabric to specified widths, embedding it will PILI, a native grass seed. The hope is that the seed will not only sprout within the rolls, but will be carried downstream with the flow and also seed in the gullies. The grass will then act as a longer-term, living sediment stop that will repropagate itself and become well established.
The spacing of the rolls is determined by the gradient slope: the steeper the surface the closer the rolls are placed. At a 30% slope the rolls are set about 25′ apart and held into place with 18″ wooden stakes. Because all of these materials are biodegradable, in time, they will be absorped into the landscape as a carbon nutrient.
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| From Sediment Stop blog 7.10 |
This finished installation took our crew of 5 an entire day, from beginning to end. That is actually not long given that it is all done by hand.
We have yet to have enough rainfall to test their efficacy but are looking forward to that moment. Even better is when we will see thousands of tiny, sprouting PILI seedlings meandering down the gullies.



