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Flood-discharge profiles of selected streams in Rockland County, New York

Water-Resources Investigations Report 84-4049

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Abstract

Flood-discharge profiles of 10 streams in Rockland County at six recurrence intervals ranging from 2 to 100 years are presented. Synthetic flood-frequency estimates were derived for nine rainfall-runoff sites from calibrated models; observed flood-frequency estimates were derived for three sites having long-term discharge records. A variance-weighting technique was applied to compare the synthetic flood-frequency estimates with the observed (gaged) estimates and estimates computed at each site from regional regression equations. For ungaged locations on the 10 streams, flood-frequency relationships were derived from regional regression equations previously developed for New Jersey streams. Regional analysis indicated the most significant basin characteristics to be drainage area, streambed slope, storage, and amount of impervious cover. A method for refining (weighting) flood-frequency estimates at selected ungaged locations near rainfall-runoff and (or) long-term gaged sites is given. This report explains analytical methods and includes a list of basin characteristics at several locations along each stream and a table of peak discharges for the six recurrence intervals at 13 gaging stations. The profiles enable the determination of flood discharge at all locations having a drainage area greater than 1 square mile on the 10 streams. (USGS)

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Flood-discharge profiles of selected streams in Rockland County, New York
Series title:
Water-Resources Investigations Report
Series number:
84-4049
Edition:
-
Year Published:
1984
Language:
ENGLISH
Publisher:
U.S. Geological Survey,
Description:
iv, 32 p. :ill., maps ;28 cm.