Hole dug for foundations of first retaining wall

Because one edge of the plot runs along a stream (the Riedsbach) we need to stop the house, garden, carport, etc. sliding down into it.  There will be three parallel but slightly off-set retaining walls running along the edge of the plot, on after the other.

Today the builders have finished digging the hole for the foundation plate for the first wall.  The foundation plate is 2m wide and about 9m long.  Sitting on the reinforced foundations (on the left hand side) will be a reinforced concrete wall 3.8m high and 9 m long - this will be the first of the three retaining walls.

Foundation trench for first retaining wall - the Riedsbach is to the left of the picture

Although the wall will be very tall, most of it will be buried.  The driveway and carport will be directly on top of the foundation plate.