The maps in the office of the department of water resources of the lands selected under the provisions of this chapter shall show the location of the canals or other irrigation works approved in the contract with the department, and all lands filed upon shall be subject to the rights of way of such canals or irrigation works. Each right of way shall embrace the entire width of the canal and such additional width as may be required for its proper operation and maintenance, the width of right of way to be specified in the contracts provided for in this chapter.