Report title: DIGITAL-map grids of mean-annual precipitation for 1961-90, and generalized skew coefficients of annual maximum
streamflow for Oklahoma
Report number: OFR 97-574
Authors: Alan Rea and Robert L. Tortorelli
Abstract
This digital report contains two digital-map grids of data that were
used to develop peak-flow regression equations in Tortorelli, 1997,
"Techniques for estimating peak-streamflow frequency for unregulated
streams and streams regulated by small floodwater retarding structures
in Oklahoma," U.S. Geological Survey Water-Resources Investigations
Report 97-4202. One data set is a grid of mean annual precipitation,
in inches, based on the period 1961-90, for Oklahoma. The data set was
derived from the PRISM (Parameter-elevation Regressions on Independent
Slopes Model) mean annual precipitation grid for the United States,
developed by Daly, Neilson, and Phillips (1994, "A
statistical-topographic model for mapping climatological precipitation
over mountainous terrain:" Journal of Applied Meteorology, v. 33,
no. 2, p. 140-158).
The second data set is a grid of generalized skew coefficients of
logarithms of annual maximum streamflow for Oklahoma streams less than
or equal to 2,510 square miles in drainage area. This grid of skew
coefficients is taken from figure 11 of Tortorelli and Bergman, 1985,
"Techniques for estimating flood peak discharges for unregulated
streams and streams regulated by small floodwater retarding structures
in Oklahoma," U.S. Geological Survey Water-Resources Investigations
Report 84-4358. To save disk space, the skew coefficient values have
been multiplied by 100 and rounded to integers with two significant
digits. The data sets are provided in an ASCII grid format.
http://ok.water.usgs.gov/abstracts/ofr97-574.html
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Last modified: Tue May 18 12:15:53 1999