Another interesting (free!) book is Utah State's Riverscapes Restoration Design Manual [1], which is about "Process-Based Restoration" of streams. Unlike the more common "form-based" restoration, PBR provides materials in the form of hand-built structures of natural materials, especially large pieces of wood.

Actually, I'd really recommend first just looking at all the pictures in the "pocket guide" version of the book. [2]

[1] http://dx.doi.org/10.13140/RG.2.2.19590.63049/2

[2] http://dx.doi.org/10.13140/RG.2.2.28222.13123/1