I think some of the biggest positive changes that could be made on a homestead would have to do with hydrology. The sooner you alter your hydrology to something that shapes the land in the way that you want it shaped, the sooner it will adapt into the new dynamism of the interconnected systems employed upon it.
For me, the greatest way to do this would be to employ
appropriate technology. If I need to cut on-contour water-infiltrating ruts, narrow, deep micro-swales or trenches that I then fill with woodchips, I won't dig them by hand. I have done so in the past, and I don't want to spend a day to trench 25-75 feet, depending on depth, width, and what I'm digging through. I will probably use one of those laser level-finders to mark contour at regular intervals with stakes, and then rent or buy a trencher, like a ditch witch, but probably a small one. Likewise, I would bring woodchips in large quantities using large trucks if I could.
We are storytelling, tool-using apes, and we have a limited span of usefulness during our also limited lives here on earth. I think it appropriate to use tools to accelerate our building to accomplish more, as I think a properly planned and executed project that has a momentum of its own has a better chance of success than one that requires my constant and careful attentions, in the event that I am made unavailable for whatever reason. We are more than capable of observing, forecasting, and amending plans over time. I have no worry that the projects that I set up are going to succeed as thriving little nuclei of self-complicating inter-related ecosystems of their own, and part of the sustainability will be the water harvesting and control measures. The earlier those get done, along with any disruptive earth-moving, the sooner perennials go into the changed areas, and the sooner the flora and fauna from the microbiology right on up adapt to better conditions for survival, and the sooner the projects' life support systems get up to speed.
An assumption that I get from having read the thread is that nature's solutions are always preferred, are always sustainable. I feel this is fallacy, from a human perspective. Nature's solutions are perfect for
nature. It may have no compunctions about something subjectively horrible happening to a well-meaning steward of the land.
I love one-rock dams, as well as rows of fallen limbs and logs anchored on-contour on hills to act as sediment traps. That is how to use hydrology to form terraces of a sort over time. But sometimes, that's not appropriate for the uses intended. Sometimes you want to dig a giant pond or a small lake, rip trenches and spillways and woodchip-filled swales for extra water capacity, and to hold it when it's dry, dredge and enlarge existing ponds, and move soil to form new forests atop your wofati-inspired dwellings and outbuildings. I don't want to do that by hand. I would never finish.
But with a season of disruption, I can put all the changes into place so that the hydrology can work for me. Shaping the land to the purposes we want it to serve saves us time and improves our chances of success, especially as it pertains to controlling erosion, ensuring everything gets what water it needs, and affording access.
As a sidebar, I love how nature works. I am cognizant, though, that nature doesn't really do much about erosion. If it has that agency on some level, I don't believe that it really cares, or has the ability to directly affect it. I don't see trees dropping their shed limbs on-contour to trap sediment eroding from uphill, except by accident. It wouldn't make sense to do that anyways, as a sediment trap will slow water and trap sediment, but would also trap and hold burning embers in the event of a forest fire.
To speak in the idiom, if the Earth Mother has agency and the ability to directly effect small changes, I have no reason to believe that what the Earth Mother and I see as beneficial or desired outcomes are the same.
I would be concerned with water harvesting and helping my tiny speck on the skin of the Earth Mother be as biodiverse, productive, and lush as possible for all living things, but primarily to
feed me and mine, and as a showcase so I can help others create their own biodiverse nucleus of resilient and regenerative food and materials production.
The Earth Mother is likely concerned with her overpopulation by one type of her children at the expense of all others. They're too crafty by far, and have, for a while now, been able to resist the viral control measures she seeks to use to lessen their numbers. But they're also not very forethoughtful about the health impacts of some of their less environmentally friendly activities, which are introducing them to more and more viral control measures. And if those don't work, the other control measures, where ocean levels rise suddenly and drown billions of coast-dwelling people after a couple of glaciers finish their slow transition from land to sea, look to be on track to do their thing. These children of hers are crafty, but they haven't reached the level of sophistication where they could refreeze polar caps. Or they probably could, given their current level of technology, at least in part, but the political will is lacking, and they're too busy squabbling over resources instead of working together to get more from the giant rocks whizzing around the Earth Mother.
But I suppose it is just a matter of perspective. I, for instance, consider some of the larger hydroelectric projects, ones that displace people and cause methyl mercury contamination, anyways, to be too large, by-and-large (a saying which annoys me, as you can sail either by or large, but not at the same time), but at the same time, if there were a solar-powered pumped hydroelectric battery project that could be designed to be fail-safe, displaced no people, and perhaps replace a melted glacier high-up in a mountainous area that would otherwise be rendered an arid mountainous environment, with desertification below, I wouldn't have a problem with it. In fact, I would probably love it, if it were executed properly.
By my interpretation, the importance of human-scale in permaculture is mostly with the day-to-day operational requirements of people working within systems. They
should be able to perform their tasks within the systems with minimal technological intervention. I like Occam's Razor technological solutions, which is how I refer to an approach to technology that starts at the simplest end and gets complex only as needed. If a counterweight allows me to swing paddock gates open by lifting a latch with a mechanism I can operate with a free foot, and I need to walk there anyways to lead the livestock, why would I consider an electric motor? Of course, if everything is tractored and moved by electric motors to a set pattern, I would need a gate that can be operated automatically.
To
answer the OP's question, I think it's because the quiet, minimal-impact approach isn't flashy enough for some. I think for some others, there is actually an appeal to either the physical manipulation of landforms, or to the operation of large, powerful machinery, or both. Personally, I want two trout ponds on-property with a running raceway zig-zagging across the whole thing to provide regular fertigation, and a solar-powered pump to move water back up to the top pond, mostly because I have delusions of salmon-raising in a multi-trophic setup where, like some landlocked varieties in the northwest, they live their lives entirely in freshwater.
See? Big ideas. On-contour sediment traps aren't going to get me there, nor are hand-dug ponds and courses, at least not until I'm too old to be able to enjoy them. Give me a ditch witch, though, and all of that becomes more attainable.
So it really is about accessibility, but in my view, from different perspectives. Some have an abundance of time with respect to their goals. Others have less time, and so are willing to accelerate their progress by mechanical means.
I would definitely agree that the larger the changes you seek to make, the more careful you need to be, and the greater the impact of possible outcomes. But that's potential good and potential bad. And as we all know, the 62nd Rule of Acquisition clearly states, "The riskier the road, the greater the profit." In this case,
profit for me entails greater biodiversity and resources yields for my systems, but also for wild systems at large, and the goal of said profit would be direct reinvestment.
I definitely agree, though, that everyone should be aware of water harvesting and control techniques other than swales, and all levels of technology appropriate to our individual goals.
-CK