In which scenario do landowners own the entire body of water?

Landowners own the entire body of water when the stream is non-navigable. In legal terms, a non-navigable watercourse is one that is not wide or deep enough for public use or transport. As a result, the water flowing through a non-navigable stream is considered to be part of the adjacent land. This means that the landowner has full rights to the water and can use it as they please, typically including rights to withdraw water for personal or commercial use.

In contrast, navigable streams are subject to public rights of navigation, which generally means that the public has the right to use these waters for transport, recreation, and other activities. In the case of navigable waters, ownership is more complex since it includes public trust doctrines that may restrict landowners' control over the water. This legal distinction is what underpins the importance of the navigability status in determining ownership rights.

The other choices do not appropriately reflect the conditions under which landowners have full control over water bodies. Water rights being granted could imply that there is an arrangement in place for access or use, possibly involving limitations. Leasing property typically involves rights to land and may not transfer water ownership, and with navigable waters, the public has access