Contents include: Study of hydrography, control and quality of Owens River water supply, by C.H. Lee; Precise level operations, January to December 1907, by C.H. Lee; Economic grade study of Elizabeth Tunnel, by J.B. Lippincott and H.A. Petterson; Economic grade study between Haiwee and Fairmont Reservoirs, revised estimate, July 1907, by J.B. Lippincott; Economic study of conduit sections (ratio of width to depth), by C.H. Lee; Computations for Kings Canyon pipe line, by C.H. Lee; Experimental determinations of value of 'N', by C.H. Lee.