"Where a dam across a stream has been maintained for 15 years — the period of limitation for actions to determine an interest in real property — the right to its continued maintenance cannot ordinarily be assailed by upper riparian landowners." The Supreme Court of New Jersey, in the case of Fairlawn Manor Homes Co. v. Wilkens, 107 N.J. Eq. 343, 152 A. 470, held: "A right to dam a stream may be acquired by prescription.