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Estimating peak discharges of small rural streams in Massachusetts

Open-File Report 80-676

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Abstract

Floodflows on natural-flow streams in Massachusetts with drainage areas between 0.25 square miles and 260 square miles may be estimated from drainage area, main-channel slope, mean basin elevation, and the area of swamps, lakes, and ponds. Multiple-regression techniques were used to define the relationship between a suite of basin and climatic characteristics and flood peaks in three flood-frequency regions at a total of 95 sites. Station flood-frequency data were computed following guidelines in Bulletin 17A of the U.S. Water Resources Council. The frequency analyses are based upon weighted skew values, and adjustments for high and low outliers, and historic peak data. The regression equations for peak discharges with 0.5, 0.2, 0.1, 0.04, 0.02, and 0.01 exceedance probabilities provide the best estimate of peak flow at ungaged sites. An improved sample of flood peaks and gaging stations and the definition of three flood-frequency regions reduced the standard error of estimate by about 5% over those for the 1977 relations. Included in this analysis were the synthetic flood-frequency data at eight sites computed using historic climatic data and 10 parameters optimized by calibration U.S. Geological Survey 's rainfall-runoff model with storm data observed over 11 years. (USGS)

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Estimating peak discharges of small rural streams in Massachusetts
Series title:
Open-File Report
Series number:
80-676
Edition:
-
Year Published:
1982
Language:
ENGLISH
Publisher:
U.S. Geological Survey,
Description:
iv, 33 p. :ill., maps ;28 cm.