California Code, Streets and Highways Code - SHC § 725

(a) Drain water, or permit water to be drained, from his lands onto any state highway by any means which results in damage to the highway.

(b) Obstruct any natural water course so as to:

(c) Store or distribute water for any purpose so as to permit it to overflow onto, to saturate by seepage, or to obstruct any State highway, to the damage of the highway.