EPA's March 2012 report on water quantity "describes the state-of-the-practice in water information processing, and sketches the framework for the type of water information system (WatIS) that will be needed to manage water resources holistically."
This EPA webpage about water supply addresses water reuse, aquifer storage and recovery, desalination, and stormwater management. Included with each topic are links to additional technical information and case studies.
This database includes reference to best management practices related to water quantity and rights. From the Getches-Wilkinson Center for Natural Resources, Energy, and the Environment at the University of Colorado Law School.
From the California Department of Water Resources. "The plan, updated every five years, presents the status and trends of California's water-dependent natural resources; water supplies; and agricultural, urban, and environmental water demands for a range of plausible future scenarios."
From the Sturm College of Law, University of Denver. "This guide's aim is to aid law students and practitioners in researching Colorado Water Law research materials, such as statutes, compacts, history, and legislation.
"California Water Law and Policy includes detailed coverage of the rights and obligations of water supplies, planning and regulatory agencies, and the relationship between the law and physical geology and hydrology."
Available on Lexis Advance.