U.S. GEOLOGICAL SURVEY
Water-Resources
Investigations Report 90-4197
Regionalization of Flood Discharges
of Rural, Unregulated Streams in New York, Excluding
Long Island
By Richard Lumia
CONTENTS
Abstract
Introduction
Purpose and scope
Acknowledgments
Study area
Physiography
Geology
Climate
Data base for regression equations
Annual peak‑discharge records
Discharge‑frequency relations
Basin characteristics
Regression analysis
Regionalization of flood‑frequency estimates
Delineation of hydrologic regions
Regional basin and peak‑discharge characteristics
Regional regression
Full‑regression equations
Drainage‑area‑only equations
Computation of peak discharge
Gaged sites
Ungaged sites
Sample computations
Limitations, accuracy, and sensitivity of regression equations
Suggestions for further study
Skewness coefficient
Precipitation, maps
Small‑stream data
Other factors
Summary
Selected References
TABLES
Table 1. Results of Wilcoxon Signed Ranks test on the 50‑year peak‑discharge regression
residuals for eight hydrologic regions in New York
2. Full‑regression equations for estimating peak discharges in each of eight hydrologic regions of New York
3. Summary of full‑regression equations for estimating peak discharges in New York
4. Correction factors to adjust regional full‑regression equations for transformation bias
5. Regional flood‑frequency equations based on drainage area only
6. Range in regional basin characteristics used in the regression analyses for eight
hydrologic regions in New York
7. Results of sensitivity analysis showing percent change in computed 50‑year peak
discharges within each of eight hydrologic regions of New York
8. Gaging stations and selected peak‑discharge records used in the study
9. Selected flood characteristics for gaging stations used in the study
10. Selected basin characteristics for gaging stations used in the study
ILLUSTRATIONS
Figures 1‑3. Maps of New York showing:
1. Physiographic provinces
2. Distribution of major. bedrock types
3. Generalized distribution of soil associations
4. Example of a flood‑frequency curve: Wappinger Creek near Wappingers Falls (station 01372500)
5. Maps of New York showing flood‑boundary delineations for five selected storms, 1913‑85
6‑14: Graphs showing:
6. Annual peak discharges and 10‑ and 100‑year recurrence intervals for selected
gaging stations in each of eight hydrologic regions of New York
7. Comparison of 50‑year peak‑discharge residuals from the statewide regression for gaging stations within eight hydrologic regions of New York, before and after regionalization
8. Comparison of selected basin characteristics for gaging stations within eight hydrologic regions of New York
9. Comparison of selected peak‑discharge characteristics for gaging stations
within eight hydrologic regions of New York
10. Stations within each of the eight hydrologic regions in New York and for all stations combined distributed by:
A. Length of period of record
B. Drainage‑area size
11.Comparison of the monthly frequency of peak flows within each of the eight
hydrologic regions in New York and for all stations combined
12. Monthly frequency of annual peak flows at gaping stations used in the study for
selected drainage‑area sizes
13. Observed 50‑year discharges for stations within eight hydrologic regions of
New York and 50‑year discharges predicted from:
A. Equations of Zembrzuski and Dunn (1979)
B. Generalized least squares full‑regression equations
C. Full and drainage‑area‑only regression equations
14. Comparison of station skews with generalized map skews from U.S. Water Resources Council (1981), for gaging stations within eight hydrologic regions of New York
PLATES
(in pocket)
Plate 1: ‑Map showing distribution of mean annual precipitation in New York (excluding Long Island), 1931‑60.
2: ‑Map showing locations of hydrologic regions and streamflow‑gaging stations used in the study.
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