Hello. I'm looking for advice regarding raising the soil grade around some existing trees to ensure they are protected. I have recently purchased some land in Laos that has been used for rice production. We are currently raising the soil grade by approximately 1 meter in preparation for future house construction. As it is extremely hot, I would really like to keep the existing trees for their shade and beauty, but I know nothing about ensuring the tree safety as the grade is raised around them. I have asked that the soil not be placed closer than the general overhang of the larger trees in order to try some of the techniques I have seen online regarding building a small retaining wall and filling the area close to the trees with stones for drainage and topped with soil to avoid soil compaction. I'm not currently in Laos which complicates things, and I have to deal with a language barrier as well. The workers say they have raised the grade right up to the tree for previous clients without problem, but I think that will lead to a long slow death. They also say if they leave the tree well open now, it will just fill with water and kill the tree that way. Also, I'm not sure when I will be back to try to finish some type of drainage/ventilation system around each tree. I'm attaching some pictures with an aerial map view with numbers on the largest and most important trees. You can see some before shots when the land is wet as the rice is planted, and some recent shots after the land is being raised. The soil will eventually be raised completely around each of the trees. Any advice would be appreciated. I don't know the type of trees, or even if they are worth saving. I can ask for better pictures if that would help. Thanks in advance.