Building 2 dams: Part 2

I started doing the damn here and
I’m stepping the system in here. I’ve got a couple steps here. You got 1, 2 and
3 and I’m just in here for scale sizing. So as I said 3 steps there and
then we have this section down here. And, just again for the scaling of this. So, you’ve got this section, up about this height there.
As I’m scraping down and I’m actually using a ‘Mattock’ here. I scrape one down and I’m building up, as I scrape down, so I’m “killing 2 birds with 1 stone” as they say. So I cut into this section here, I
scrape it on down and I pile it up there. Now of course if
you don’t have a mattock and that’s basically, for those who don’t know, it’s
nice wooden handle, big steel thing, right like that so you can whack into the ground. If you don’t have one of those what you got to do, is you got to wait for the rain and the rain softens up the soil and then you get in there with them with a
casuarina digging stick. Small-scale example, but you basically just scratch around like that, then you get your hands, like that and you just keep on repeating. Which is actually probably easier (to be
honest) than with a mattock. So with a big stick this is actually quite efficient.
And of course, casuarinas are very hard, hardwood. So again, size comparison, so there’s me, there’s the wall.
So, there’s my mighty damn there. and it’s actually holding, believe it or
not. The neighbours’ dam has overflowed up there, coming on down here. That is a fair
dinkum Rapids. look at that, Far Out! That is just gushin’ over. That is bloody amazing. Yeah, might be a bit of erosion, but all
this stuff here is now going to bring all these bits of sediments and little
bits of fish and that’s going to fill in all the gaps down here. That’s all good stuff
and it might also dislodge a couple extra rocks I can use, so that’s all good stuff.
And strong swimming animals can actually swim upstream during these
times, like platypus and crayfish and so forth, very
impressive. This area here only up to about ankle
deep, but further in there I’d be up to about my waste. Far Out! There’s a lot of sand sediment, actually,
at the bottom that I can feel. Yeah oh, that’s bloody amazing. That is phenomenal. All righty, so
after a record 390 millimetres of rain in a 3 day period our dam is now
quite full. This was cascading over before and I’ll
get on in there in a second to show you, to show you a little bit of how deep
this actually is. Now I’ve been adding a few extra rocks to this and then
scooping in a whole bunch of the sediment that’s actually deeper down in
there and piling that up, to stop the water flow. So there you go, that’s actually a lot
deeper right about here but there’s now about a foot deep of sediment here, so I
would actually be about this deep in it If I get my legs really into that sediment. This is a great time to actually add to the wall and this is something you’ll find often happens in building in a natural way is that you’re kind of governed by the seasons and the rainfall. The rain has washed down a lot of sediment here and so we’ve
got a deep, deep amount of sediment here and so it’s a lot looser and easier on
the hands at moment to be able to grab large amounts of that and plonk that in
like that. The reason for the big rocks is because they hold the smaller rocks
and the sediment in place. The reason for the sediment is cuz it fills in all the
little gaps, between the rocks. So we’ll show you another angle now. so as you can see, this middle section
(in here) is actually blocking water quite well. These side sections are
letting the water out and that’s fine because we’re going to be filling those
up a bit more. So you can gauge. Wah lah.
There you go. That’s good height up to there. As I said, a couple big rocks and a whole bunch of sediment. in the middle of the stream we’ve got a whole bunch of smaller rocks that have washed in and again they’re really good
for holding the sediment in place. But you get the basic idea

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