Water Resources for Alaska GIS datasets Statewide Coverages

Science Center Objects

Legacy Data for AK Precipitation, Hydrologic Unit Map, and Streamflow analysis regions for AK and conterminous basins in Canada.

Alaska Precipitation

ak_precip is a polygon coverage created from a 1:2,000,000 scale map showing lines of equal annual precipitation in Alaska. The precipitation map was prepared in 1994 as part of a flood frequency study of the streams and rivers of Alaska and was digitized into a GIS format. 
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Hydrologic Unit Map

Hydrologic Unit Codes Map for the State of Alaska by Robert D. Lamke, Timothy P. Brabets and Jacqueline A. McIntire.  
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Streamflow analysis regions for Alaska and conterminous basins in Canada

This coverage shows the seven streamflow analysis regions (areas having similar hydrologic characteristics) developed for Alaska and conterminous basins in Canada to help formulate regional equations for estimating selected streamflow statistics, including high-duration flow, low-duration flow, low-flow frequency, and peak-flow frequency. Streamflow analysis region boundaries may be used to determine the region or regions containing a gaged or ungaged site's drainage area in order to select the appropriate regional equations from Wiley and Curran (2003) and Curran and others (2003).

Line Coverage |  Polygon Coverage

References

Curran, J.H., Meyer, D.F., Tasker, G.D., 2003, Estimating the magnitude and frequency of peak streamflows for ungaged sites on streams in Alaska and conterminous basins in Canada: U.S. Geological Survey Water-Resources Investigations Report 03-4188, 101p.

Wiley, J.B., and Curran, J.H., 2003, Estimating annual high-flow statistics and monthly and seasonal low-flow statistics for ungaged sites on streams in Alaska and conterminous basins in Canada: U.S. Geological Survey Water-Resources Investigations Report 03-4114, 61p.

Illustration shows study area was divided into seven streamflow analysis regions in Alaska

For USGS WRIR 03-4114, the study area was divided into seven streamflow analysis regions based on hydrologic boundaries, geographic distribution of basin characteristics, and results of regressions with peak, high-duration, and low-duration streamflow data. For consistency between analyses, regional boundaries are constant. However, regions were combined as hydrologically appropriate to develop equations, such that Region 3 is grouped with Region 1 for high-duration flows but with Region 4 for low-duration flows.
(Public domain.)