Writing this, I thought- wow I hope this doesn't sound kinda too know-it-all or over-opinionated
There are my personal experiences though so, maybe we can help one another
The short version:
hugelkulture on hill, making heavy mulch with terraces and swales on contour, using rocks as borders and planting in a food forest method to retain water and nutrients
The long version:
I have a hugelkultur bed at the top of a hill that I started a while ago when I was trying to do something hands on but really hadn't visited permies in a while (I know, shame on me)
I have this issue where I have a hilly backyard that slopes down and flattens out into my neighbor's lovely, flat, green monoculture lawn. I've known for quite some time I was letting minerals and nutrients leach downhill with the rain.
I have decided that at the low end of the yard I'll make a small pond with tamped clay and rocks. It will go from humid and hot to cold and dry here back and forth so I would like to build something to trap the rainfall coming downhill.
My first attempt to capture the rain and keep all the nutrients in my yard was a small berm of compost shoved under dug up pieces of turf. This created the base of what I will use to build a small, shallow pond that will likely ebb and flow
with the rainfall / seasons. I don't plan to use it for fish, nor to let it become a mosquito bed in warmer seasons.
Midway down the hill, I began to dig a 8" deep ditch, using large rocks to cover the ditch and leaving the soil in front (uphill) of the little trench. I then covered it all in a mix of straw and compost, sweeping off the rocks so they can catch sunlight.
I am slowly but surely flattening about 4 layers of height on this hill into 4 terraces, with the bottom all naturally flowing into a pond.. but I'd love to build a water fountain in it if I put enough work into it.
I am home almost all the time and give my growing areas that I tend to a quick rake/sweeping over the top, heavy mulch and it prevents anything from getting too stale or stagnant. My backyard has tons of worms in it these days. Frogs like to hang
out in the heavy mulch and eat bugs, you can really see the difference of richness of life in the soil compared to my neighbor's yard.
I am building this in a way, with my heaps of straw intended to degrade over time with weathering, raking and the application of microbes, although instead of planning out a boxed up garden, I have begun to create cobblestone pathways in something
that is beginning to resemble a fruit forest.
One really great thing about the incline of the hill is that the bottom of it collects dead leaves and soon-to-be-compost things pretty well. Also, I have a bad habit of over-watering plants so the mulch and me keeping an eye on them daily helps me gauge what
is generally going on. I like to go out in the early mornings when the sun is just rising and tend to my yard/garden (yarden?) with a rake and small utility knife, it's a good time of the day to get a feel for things, whatever the season. I don't have any livestock
and my cats and dog ignore me when I ask them to help me with slugs, but since it's a space I can manage on my own I have just sprinkled 'strategic' parts of my yard with diatemateous earth and a daily check of things together seems to keep most of the
slugs and ornery lil critters at bay.