Includes: Letter from W.P. Rowe, 9/21/26, re: flood control and conservation Santa Ana River (San Bernardino Region); Legal opinion, Spencer Borroughs, "Re: damage resulting from overflow or breakage of flood control works erected by a public agency created for the purpose of establishing protection from floods," dated May 27, 1926; exchange of letters J.B. Lippincott and S.T. Harding re: effect of rainfall on absorbent valley floors in replenishing ground water supplies; memorandum by A.L. Sonderegger, May 17, 1926, on water supply resulting from rainfall on the valley floor in San Gabriel and San Fernando Valleys.