| Most of these walls were done with old lava stones that were at a
house retaining the land in a very informal way and we rolled them out and
cleaned off all the dirt, Digging back a ways and reworked the rocks into
a formal wall. In the case of the wall on the sidewalk, we used an
advanced drain system for durability and structural strength. Using
a filter cloth up against the soil, laying the perforated drain pipe in
the bottom of the trench, back filling with pea gravel, and providing weep
holes every twenty feet. |