The board shall have the right and authority to enter into contracts or other arrangements with the United States government or any department thereof; or with the state government of this or other states; or with irrigation, drainage, conservation, conservancy or other improvement districts, in this or other states; or with persons, or public corporations; for cooperation or assistance in making surveys or investigations and reports thereon; in constructing, maintaining, using and operating works of the district, in acquiring, purchasing, extending, operating or maintaining constructed works; water supplies, water systems, irrigation or drainage works, dam and reservoir sites; in building dams to impound flood waters; in conserving and using the said waters for irrigation or other purposes, including the development of hydroelectric energy; in purchasing, leasing or acquiring land or property in adjoining states in order to secure outlets and other needs of the district; and in any other manner furthering the purposes and incidental purposes of districts.