Michael Cox wrote:Vetiver grass hedges - They form a living barrier that slows and sinks surface run off, like a swale, produce biomass for building soil, and trap lot of sediment up hill of them. They incredibly strong and deep root system, and are used on steep ground to stabilise slopes.
The cope well with arid environments once established. They aren't tolerant of heavy frost, but I'm unclear if that would be an issue in your area.
Melissa Ferrin wrote:Looking a bit closer at your photos, there is quite a lot of existing vegetation on the property. What are his plans? Just a nice place to live out retirement, or does he need to generate an income? Does he was to produce much of his own food?
I would identify existing vegetation that you want to keep and make a mulched basin around those trees. There's a very short kind of tree in the Mesquite family called Tehuitxle in Oaxaca, though I find plants have a lot of regional names in Mexico, but it looks a lot like what you have there. Left in its natural circumstances they only get to be about 3 meters tall, but I have one of these trees in my yard that is about 6 meters tall. They are thorny and want to shoot branches out low to the ground. But you can cut off all the low branches to encourage it to grow up. These give great shade, in order to get it to grow how you want you must prune often and giving it a mulch basin will allow the water to soak in.
I also suggest you check out Brad Lancaster's work https://www.harvestingrainwater.com/ He's located in Tuscan, Az which has similar rainfall patterns as central Mexico.
Melissa Ferrin wrote:Julio, you need to get in touch with another Cabellero Cervantes family. They are located in Tlaxcala and in the past 70 years complete reforrested a wasteland and developed a method called the Tlaxcalal Method. Don Carlos, who passed away several years ago started the work but his children continued it. One son, Juan Carlos Cabellero Cervantes , got his degree in forestry and his dissertation is available as a book and one of his daughters runs a permaculture education center. Their method rather than swales, uses a narrow trench of about 20cm on contour on very steep slopes. To slow, spread and sink the water. They also collect local seeds of all types of plants that are growing and make Fukuoka style seed bombs and just toss them into the area after the trenches are dug. They do not direct plant trees, but they now have a forest.
Also you might want to visit, https://viaorganica.org/experiencia-de-restauracion-de-ecosistemas/ which might be nearer your father than Tlaxcala is.
Cole Tyler wrote:I'm on a 15-20° slope and have found that swales are ok when that steep, you'll have to do multiple rows of them, tinkering with varying degrees of contour to account for overflow - in which certain areas can be deeper, etc. like catchment basins, then run-off into another basin/swale combo.
I also place rocks, and let thick weeds grow up in the areas that erosion starts to happen because I've found inevitably that nature has a way of seeking out to compromise our plans. A basic install with mapped out topography, then tinkering and modifying after a few rain/dry spells to work towards holding the water after you see the results of your work!
Trying to incorporate roads/paths among the hillside while still incorporating swales is a bit tricky but should be considered if you plan on maintenence or plantings.