[Flood-control works authorized.] For controlling the floods, removing the débris, and continuing the improvement of the Sacramento River, California, in accordance with the plans of the California Débris Commission, the Secretary of the Army is authorized and directed to carry on continuously, by hired labor or otherwise, the plan of said commission contained in its report submitted August 10, 1910, and printed in House Document Numbered 81, Sixty-second Congress, first session, as modified by the report of said commission submitted February 8, 1913, approved by the Chief of Engineers of the United States Army and the Board of Engineers for Rivers and Harbors, and printed in Rivers and Harbors Committee Document Numbered 5, Sixty-third Congress, first session, insofar as said plan provides for the rectification and enlargement of river channels and the construction of weirs, to be paid for as appropriations may from time to time be made by law, not to exceed in the aggregate $5,600,000: Provided, That not more than $1,000,000 shall be expended therefor during any one fiscal year.

[Limitation on expenditure of appropriations generally.] (a) All money appropriated under authority of this section shall be expended under the direction of the Secretary of the Army, in accordance with the plans, specifications, and recommendations of the California Débris Commission, as approved by the Chief of Engineers, for the control of floods, removal of débris, and the general improvement of the Sacramento River: Provided, That no money shall be expended under authority of this section until assurances have been given satisfactory to the Secretary of the Army (a) that the State of California will contribute annually for such work a sum equal to such sum as may be expended annually therefor by the United States under authority of this section; (b) that such equal contributions by the State of California will continue annually until the full equal share of the cost of such work shall have been contributed by said State; and (c) that the river levees contemplated in the report of the California Débris Commission, dated August 10, 1910, will be constructed to such grade and section and within such time as may be required by said commission: Provided further, That said State shall not be required to expend for such work, for any one year, a sum larger than that expended thereon by the United States during the same year: And provided further, That the total contributions so required of the State of California shall not exceed in the aggregate $5,600,000.

[Expenditure of contributions by State of California; acquisition of sites, easements, etc.] (b) All money contributed by the State of California, as herein provided, shall be expended under the direction of the California Débris Commission and in such manner as it may require or approve, and no money appropriated under authority of this section shall be expended in the purchase of or payment for any right-of-way, easement, or land acquired for the purposes of this improvement, but all such rights-of-way, easements, and lands shall be provided free of cost to the United States: Provided, That no money paid or expense incurred therefor shall be computed as a part of the contribution of the State of California toward the work of improvement herein provided for within the meaning of paragraph (a) of this section.

[Maintenance of works for flood control by State of California.] (c) Upon the completion of all works for flood control herein authorized the said works shall be turned over to the State of California for maintenance thereafter; but for all other purposes the United States shall retain such control over the same as it may have the right to exercise upon such completion.