California Code, Government Code - GOV § 39961

(a) Improve the rivers and streams flowing through or adjoining the city, widen, straighten, and deepen their channels, and remove obstructions from them.

(b) Acquire and improve public mooring places for water craft.

(c) Improve the city water front, including the ocean front, and build and construct breakwaters, jetties, and sea wall.

(d) Construct and maintain embankments and other works to protect the city from overflow.