Section 13(c) of the Wild & Scenic Rivers Act expressly reserves the quantity of water necessary to protect river values, including water quality and flow-dependent outstandingly remarkable values. This reservation of water is called a federal reserved water right and is generally adjudicated in a state court (e.g., basin-wide adjudication). River designation does not supersede existing, valid water rights.
Refer also to CRS Report for Congress, The Wild and Scenic Rivers Act and Federal Water Rights, by Cynthia Brougher (January 9, 2009).
Water law is a complex legal area, and water rights are a highly contentious issue. Whenever a water allocation issue arises, a river manager should consult with staff with water rights expertise and, as necessary, seek legal counsel.