Brisbane Local Food
It's the rainy season here in Australia, so I decided to put in some proper swales.
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I put some pretty substantial rocks on the corners where the water would undermine banks. I'm not so worried about banks. My biggest worry is that I'm worried a big downpour will move the mulch. I'm wondering if I could plant a few vetiver inside the swales to slow the flow. I could also then use it to increase the height of the banks and maybe chuck a few more big rocks into the low points.
True -- Christa is right: Vetiver is a good option --and you'll save on your sugarcane mulch bill as you'd have a domestic harvest of mulch.
'Swale' is very much a Permaculture term that presumes physical digging and heaping. Whereas Vetiver 'grows' a swale if you lay it out according to your contour preferences -- your sculpting to a plan.
Watching the video you'd have two options, I reckon:
I'm not qualified to 'consult' on bio-enginneering challenges -- but yours is a small scale problem that a few plants -- later divided into greater numbers -- could readily solve.
Christa's drainage problem --that she applied Vetiver to -- seems similar to yours.
My guess is that many rising blocks on smallish lots in the Brisbane foothills could utilize Vetiver plantings for drainage management...with the added advantage of a ready mulch harvest.
And Vetiver, as grasses go, looks good.
Have you thought about using some vetiver around the edges to hold the banks of soil. It looks much better than the last time we saw it, Andrew.
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