Scientific Investigations Report 2006-5035
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006-5035
Estimating Low-Flow Frequency Statistics for Unregulated Streams in Idaho
By Jon E. Hortness
Table of Contents
Conversion Factors, Datums, Definitions, and Abbreviations and Acronyms
Abstract
Introduction
Low-Flow Frequency Statistics at Gaging Stations
Estimating Low-Flow Frequency Statistics at Ungaged Sites
Summary
References Cited
Figures
Figure 1. Location of the study area, streamflow-gaging stations, and eight regions used to estimate low-flow frequency statistics for unregulated streams in Idaho.
Figure 2. Joint distribution of two example basin characteristics, mean basin elevation and mean annual precipitation.
Tables
Table 1. Sources for data used to obtain basin characteristics used to estimate low-flow frequency statistics for unregulated streams in Idaho.
Table 2. Description of basin characteristics used in the final equations for estimating low-flow frequency statistics for unregulated streams in Idaho .
Table 3. Logistic regression equations used to estimate the probability of zero flow for unregulated streams in regions 4, 6, and 7 in Idaho.
Table 4. Regression equations for estimating low-flow frequency statistics for unregulated streams in regions 1-8 in Idaho.
Table 5. Range of values of basin characteristics used to estimate low-flow frequency statistics for unregulated streams in regions 1-8 in Idaho.
Table 6. Selected information for gaging stations used to estimate low-flow frequency statistics for unregulated streams in regions 1-8 in Idaho.
Table 7. Low-flow frequency statistics for streamflow-gaging stations used in low-flow regression analyses for unregulated streams in regions 1-8 in Idaho.
Table 8. Basin characteristics considered during the low-flow regressin analyses for unregulated streams in Idaho.
Table 9. Basin characteristic values used to develop the final probability and estimating equations for low-flow frequency statistics for unregulated streams in regions 1-8 in Idaho.
Table 10. Total years with the N-day low flow equal to zero and total years of record for streamflow-gaging stations used in logistic regression analyses for unregulated streams in regions 1-8 in Idaho.
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Send questions or comments about this report to the author,
Jon E. Hortness
, (208) 387-1319
For more information about USGS activities in Idaho, visit the
USGS Idaho Water Science Center home page
.
U.S. Department of the Interior |
U.S. Geological Survey
