I was reluctant to state it completely because California's constitution itself limits water rights. It would be unconstitutional to cover your entire property

I was reluctant to state it completely because California's constitution itself limits water rights. It would be unconstitutional to cover your entire property with a giant roof and capture all the water, thereby eliminating the creek downstream of your property and denying the downstream users of their riparian rights. However this is not the use I believe the OP was looking at.