Slope protection is a procedure carried out to protect the "Slope (engineering)" slopes of engineering works, or natural slopes, against damage caused by water runoff or the avatar of the waves of a lake, river, or sea against its banks.

Slope protection is carried out in several ways:

The rockfill must be made up of healthy, hard, solid, durable rocks, with a specific weight of no less than 2.6 T/m³. Weathered rocks should not be used. The material will be reasonably well graded, and efforts will be made to ensure that each load of material placed contains a homogeneous mixture of rock throughout the size range.

The rockfill will contain approximately 40% of rocks of size equal to the theoretical thickness of the layer, 40% of blocks of size equal to 60% of the thickness of the layer, 15% of blocks smaller than 60% of the thickness of the layer and a maximum of 5% of sand and rock dust.

The rock must be obtained from appropriate quarries, in which durability tests, among others, have been carried out.

The work method is organized in such a way as to avoid the segregation of the rock in the material handling process, carrying out the selective loading of the dump trucks, if necessary.

The slopes on which rockfill will be placed will be outlined, ending in the theoretical lines indicated on the plans, with a maximum tolerance of 10 cm. The non-woven geotextile will be placed on the profiled slopes, when necessary, and on top of this, there will be a support bed for the rocks, made of fine material without sharp edges and with a thickness of no more than 10 cm. The placement of the geotextile prevents the filtration of soil fines that could damage the structural integrity of the slope.

When placing the rockfill, it will be of the specified final thickness, in one or two operations. The rockfill placed will be well graded, with a minimum percentage of voids and without areas with accumulation of small or large stones. To place the rocks, canoes or other methods that may cause segregation of the material should not be used, and manual labor will be used when necessary.