"The national streamflow statistics program" ed. by Ries III, K.G.

This report describes the regionalization techniques used to develop the equations in NSS and provides guidance on the applicability and limitations of the techniques. The report also includes a users’ manual and a summary of equations available for estimating basin lagtime, which is needed by the program to generate flood hydrographs.

Contents
Abstract
Introduction
Purpose
Report Format
How to Obtain the NSS Software and Documentation
History and Overview of Methods for Regionalization of Streamflow Statistics
Introduction
Index-Flood Procedures
Ordinary-Least-Squares Regression
Weighted- and Generalized-Least-Squares Regression
Region-Of-Influence Regression
Estimating Techniques for Rural Areas
Introduction
Watershed and Climatic Characteristics
Hydrologic Regions6
Measures of Accuracy
Techniques for Watersheds that Span Regional/State Boundaries
Weighting of Independent Estimates of Rural Flood Frequency
Weighting for Streamgaging Stations
Weighting for Ungaged Sites on Gaged Streams
Urban Flood-Frequency Estimating Techniques
Introduction
Nationwide Urban Flood-Frequency Equations
Local Urban Flood-Frequency Equations
Flood Hydrograph Estimation
Estimation of Extreme Floods
Measures of Extreme Floods
Extrapolation for the 500-Year Flood
Testing and Validation of Techniques
Summary of Estimating Techniques
StreamStats
Acknowledgments
References Cited
Appendix A. National Streamflow Statistics Program Users’ Manual
Downloading and Installing the Program
Starting the Program
Main Window
Menu Items
File Menu
Graph Menu
Help Menu
Manual
Web Site
About
Edit Scenario Window
Frequency Window
Hydrograph Window
Weight Window
Appendix B. Summary of Equations for Estimating Basin Lagtime