Includes supplement: Colorado River or Tributary Water - U.S. Geological Survey Update of the Accounting Surface Along the Lower Colorado River, by Stephen M. Wiele, Stanley A. Leake, Sandra J. Owen-Joyce, and Emmet H. McGuire.It is no doubt a sign of the drought-struck times that efforts to strictly account for lower Colorado River water use are now focusing on individual landowners and homeowners who have drilled wells and pump water along the lower Colorado River. Up to now, efforts to regulate Colorado River water use have mainly been directed at the big water users: states, Indian nations and irrigation districts. Collectively these small-scale water users, most of whom are householders taking care of domestic water needs, consume a si...