California water right laws
https://www.waterboards.ca.gov/waterrights/board_info/faqs.html
What is a riparian right?
A riparian water right is a right to use the natural flow of water on riparian land. Riparian land is land that touches a lake, river, stream, or creek. Land that is in the public domain does not have riparian rights. The U.S. Bureau of Land Management manages public domain land.
Most eastern states recognize riparian rights. Most western states either never recognized riparian rights or no longer do so. California and Oklahoma are the only western states that continues to recognize riparian rights. The California Legislature has enacted very few laws regarding riparian rights. As a result, riparian rights have been frequently litigated. As a result of these lawsuits, the courts have clarified rules that apply to riparian rights
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