ghay,
grazing land must be has 1-2 mether deep topsoil. so its fertile layer. if you can divert to water with slope breaker you can see the natural vegetation will be come same year. but you focus on re-spreading topsoil
two way,
first one is RipRap. its cheap but you need to good foreman. he must be like puzzle as you know RipRap like an Puzzle and should be focus on key stone and unsoluble rocks.
another one is Gabion desk. its not cheap.
Steep slopes ( angle %37 maybe more) major soil type coarse material and topsoil deep 5 cm. no B horizon.
hydroseeding. my question is hydroseeding application hows working on this slope. if is no topsoil how I can paste seed to surface.