Alaska StreamStats - Cook Inlet Basin

StreamStats is available for in Alaska only for the Cook Inlet Basin. This application provides the ability to delineate drainage basins at user-selected sites, determine the drainage area and the basin average mean annual precipitation for 1971 to 2000 from the PRISM climate dataset, and estimate the 50-, 20-, 10-, 4-, 2-, 1-, 0.5-, and 0.2-percent annual peak-flow exceedance probability discharges using regression equations from the below report:

• Curran, J.H., Barth, N.A., Veilleux, A.G., and Ourso, R.T., 2016, Estimating flood magnitude and frequency at gaged and ungaged sites on streams in Alaska and conterminous basins in Canada, based on data through water year 2012: U.S. Geological Survey Scientific Investigations Report 2016-5024, 47 p.

In addition to presentation of the regression equations, the report also describes the errors associated with the estimates obtained from the equations, the methods used to develop the equations, and the methods used to compute the basin characteristics used as explanatory variables in the equations. StreamStats users should familiarize themselves with the report before attempting to obtain estimates of streamflow statistics for ungaged sites. Application of the equations to ungaged sites assumes that flows at the sites occur under natural conditions.

Click on this link to obtain general information on the Alaska application, as well as specific sources and computation methods for basin characteristics.