Keep in mind the block at each step up must be completely buried to maintain the proper base depth and to prevent wall failure due to erosion.
How to build a concrete retaining wall on a slope.
Layout the concrete stones that will be used where the wall will be built.
Install the first course of blocks using a taut string line to establish a straight row.
After painting move the stones aside until it is time to place them permanently.
Level to level blocks lengthwise and a torpedo level to level the front to back.
In turn in order to prevent the silting of gravel layer it is wrapped with the geotextile fabric.
Use the stones as a guide to spray paint lines on the ground.
Prepare the footing spread mortar and build leads sliding the block over the rebar as needed.
Dig into the earth to span about 2 feet back from the front side of your planned wall.
Dig 6 inches deeper at the base.
Repeat these steps to the top of the grade.
Build the footing and insert rebar into the wet concrete at intervals corresponding to the cores in the blocks.
Lay out the wall and excavate the slope and the footing trench.
Once the first row is installed pack native soil to grade level on both sides of this course to anchor the wall in place.
Step up retaining wall into slope compact the wall rock directly behind the block and the next step up area a minimum of two passes with a plate compactor.
A drainage pipe is lowered down the slope where it gets rid of the water.
Put one line about eight inches behind the stones and the other line about three inches in front of the stones.