American Society of Civil Engineers

Estimating Equation for Mixed Populations of Floods in Massachusetts

by Peter J. Murphy, M.ASCE, (Hydrol., U.S. Geological Survey, 28 Lord Rd., Marlborough, MA 01752)

Journal of Hydrologic Engineering, Vol. 6, No. 1, January/February 2001, pp. 72-74, (doi:

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Document type: Technical Note
Abstract: A single equation for estimating the peak flows of annual floods at ungauged sites in Massachusetts was developed by combining the conditional probabilities of floods caused by tropical cyclones and ice-jam releases with the conditional probability of "ordinary" floods. Regression equations for these three flood populations demonstrated that two basin characteristics, drainage-basin area and basin head, and frequency of flooding determined the corresponding peak-flow rates.

ASCE Subject Headings:
Peak flow
Flood frequency
Drainage basins
Regression analysis